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Formulation And Calculation Free Doubts and Solutions

CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

25g of a solute of molar mass 250g/molecular is dissolved in 100ml of water to form a. Solution whose density is 1.25 g/ml. The molality is? ( answer =0.8) please solve it . 

Asked by govtsecschoolnayaganv051 16th January 2019, 9:07 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Advantages and disadvantages of empirical formula 

Asked by ngulliehachi 7th January 2019, 6:57 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A steel cylinder contains a gas at 250kpa and at 27°c. The cylinder can withstand a pressure of (10)*6 Pa. Due to fire, the temperature of the room rises. If melting point of the cylinder is 1527°c, predict whether the cylinder will blow up before it melts or not ?

Asked by rrpapatel 2nd November 2018, 12:19 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A mixture of pure AgCl and AgBr contains 60.94% Ag by mass what is %  of AgCl in sample

Asked by shahrithik07 8th October 2018, 6:44 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

how to solve this ?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

'X' forms an oxide X2O3 , 0.36 g of X forms 0.56 g of X2O3 so atomic weight of X is

Asked by Deepak 2nd September 2018, 8:44 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Excess of NaOH (aq) was added to 100 mL of FeCl3  (aq) resulting into 2.14 g of Fe(OH)3 . The molarity of FeCl3  (aq) is : (Given molar mass of Fe=56 g mol−1  and molar mass of Cl=35.5 g mol−1 )  

Asked by kmondaldgms 23rd August 2018, 11:04 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The oxide of an element possess the molecular formula M2O3. If the equivqlent mass of the metal is 9,the molecular mass of the oxide will be??

Asked by minipkda 18th August 2018, 8:37 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The specific heat of a metal M is 0.25. Its equivalent wgt  is 12. What is the correct atomic wgt ?  

Asked by minipkda 18th August 2018, 8:13 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

8th?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A compound contains 38.8% of C,16.0% of H and 45.2% of N.What is the formula of the compound?

Asked by sligade7 16th July 2018, 10:10 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

An iron ore sample is impure Fe2O3. When Fe2O3 is heated with an excess of carbon , iron metal is produced as per the following equation: Fe2O3(s)+3C(s)→2Fe(s)+3CO(g) From a sample of ore weighing 752 kg ,453 kg of pure iron was obtained.What is the % of Fe2O3 in the sample?

Asked by dineshchem108 15th July 2018, 5:48 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Find out the emperical formula and molecular formula in organic compund contain 62.07 % Carbon,10% Hydrogen,and 14% Nitrogen. The molecular mass of compound is 114 gm/mole

Asked by Shreypanchalspiky 6th July 2018, 11:24 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

calculate the percentage of the each element in 9.8g of sulphuric acid 

Asked by shaileshbhagat82816 3rd July 2018, 7:16 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Emperical formula of a gaseous compound is CH2Cl. 0.12 g of the compound occupies a volume of 37.20cc at 105 degree centigrade and 768mm Hg.Find the molecular formula of the compound.

Asked by tps.mjmdr 22nd June 2018, 6:36 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

how many grams of 83.4% pure sodium sulphate can be produced from 250gm of 95% pure sodium chloride on reaction with conc. sulphuric acid  

Asked by tps.mjmdr 21st June 2018, 10:28 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Emperical formula of a gaseous compound is CH2Cl. 0.12 g of the compound occupies a volume of 37.20cc at 105 degree centigrade and 768mm Hg.Find the molecular formula of the compound. 2500 cc of oxygen was burnt with 600cc of ethane.Calculate the volume of unused oxygen and the volume of Carbon dioxide formed.

Asked by tps.mjmdr 20th June 2018, 10:10 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

2.5g of gane sugar is dissolved in147.5g of water find percent by weight of solution  

Asked by gaurijagtap1246 22nd May 2018, 8:58 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

a 6.90M SOLUTION OF kOH in water coinains 30% by mass of KOH what is the density of solution

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The specific heat capacity of metal is 1 J/g/K . If equivalent mass of metal is 9 , calculate it's exact atomic mass

Asked by arunavamitra50 6th May 2018, 8:11 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Dissolving 120g of urea in 1000g of water gave a solution of density 1.12 g/ml . The molarity of solution is ?

Asked by arunavamitra50 5th May 2018, 8:35 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

?

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How much NaOH is required to prepare 50 ml of aqueous solution  with 70 mg of Na+ ions per ml of solution

Asked by nishtha02082002 23rd April 2018, 12:53 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How many grams of hydrogen chloride,HCL  are required to prepare 4 Litre of 5M HCL in water

Asked by nishtha02082002 23rd April 2018, 12:13 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Dieldrin, an insecticide, contains C, H, Cl and O. Combustion of 29.72 mg of dieldrin gave 41.21 mg CO2 and 5.63 mg H2O. In a separate analysis 25.31 mg of dieldrin was converted into 57.13 mg AgCl. What is the empirical formula of dieldrin?

Asked by Rishav 11th March 2018, 1:23 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Calculate the number of atoms of C and O in 72.5g of isopropanol C3H7OH (molar mass=60)

Asked by kpbhake 12th November 2017, 4:49 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How to convert a empirical formula into molecular formula?

Asked by kpbhake 22nd September 2017, 10:49 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

THE GAS HAVING THE SAME NUMBER OF MOLUCLES  16G OF OXYGEN?

Asked by drarunprathap 26th August 2017, 7:30 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The de-Broglie wavelength associated with an electron which moves KE of 4*10^-19 J

Asked by Anil 1st August 2017, 12:54 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

8g of divalent metal produces 9.8 g of its nitride. The approx atomic weight of metal is   

Asked by Anil 1st August 2017, 12:49 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

1.82 g of a metal required 32.5 ml of 1M HCl to dissolve it. What is the equivalent mass of metal?

Asked by Anil 25th July 2017, 10:41 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

If a piece of iron gains 10% of its mass due to partial rusting into Fe2O3 the percentage of total iron that has rusted is

Asked by Anil 11th June 2017, 7:56 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

0.17g of ammonia on decomposition gave 0.14 g of nitrogen and rest hydrogen. What will be the volume of hydrogen evolved at S.T.P?
 

Asked by lekhakarthikeyan 27th May 2017, 11:48 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A metal forms two oxides. The higher oxide contains 80% metal. 0.72 g of of the lower oxide gives 0.8g of the higher oxide when oxidized. Illustrate using the law of multiple proportions
 

Asked by lekhakarthikeyan 27th May 2017, 11:42 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Metal chloride contains 71% chlorine. Then calculate equivalent weight of that metal bromide

Asked by Anil 25th May 2017, 2:31 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Molarity of pure D2O will be(assume density of D2O is 1g/ml)

Asked by Anil 25th May 2017, 2:21 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A gaseous mixture contains 40% O2, 40% N2, 10% CO2,10% CH4 by volume. Calculate the vapour density of the gaseous mixture.

Asked by Anil 25th May 2017, 2:18 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

11.2 litre of a hydrocarbon at STP produces 44.8 litre of CO2 at STP and 36 g of H2O during its combustion. Calculate the molecular formula of hydrocarbon

Asked by Anil 25th May 2017, 2:11 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Calculate the total no. of atoms in 2 litre gaseous mixture of CH4 and SO2 at STP which have vapour density 26

Asked by Anil 24th May 2017, 3:01 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A compound H2X with molar weight of 80 g is dissolved in a solvent having density of 0.4 g/ml. Assuming no change in volume upon dissolution, the molality of a 3.2 molar solution is

Asked by Anil 23rd May 2017, 2:53 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

If the value of Avogardo number is 6.023*10^23 and the value of Boltzmann costant is 1.380*10^-23 J/K, then the number of significant digits in the calculated value of the universal gas constant is

Asked by Anil 23rd May 2017, 2:50 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

29.2 %(w/w) HCl stock solution has a density of 1.25 g/ml. The molecular weight of HCl is 36.5 g/mol. The volume(ml) of stock solution required to prepare  a 200 ml solution of 0.4 M HCl is

Asked by Anil 23rd May 2017, 2:40 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Silver has a density of 10.5 g/cm3. The number of silver atoms on a surface of area 10^-12 m2 can be expressed in scientific notation as y*10^x. The value of x is 

Asked by Anil 23rd May 2017, 2:25 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A mixture of FeO and Fe3O4 when heated in air to constant weight gains 5% in its weight. The % of FeO in the sample is

Asked by Anil 19th May 2017, 10:28 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Ammonia gas is passed into water,yeilding a solution of density 0.93 g/cm3 and containing 18.6% NH3 by weight. The mass of NH3 per cc of the solution is

Asked by Anil 19th May 2017, 10:10 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

When 400 g of a 20% solution by weight was cooled, 50 g of solute precipitated. The percentage concentration of remaining solution is

Asked by Anil 17th May 2017, 3:07 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

0.92 g of Ag2CO3 is heated strongly beyond its melting point. After heating the amount of residue is

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The vapour density of a volatile chloride of divalent metal is 59.5 and equivalent mass of metal is

Asked by Anil 17th May 2017, 2:36 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The number of neutrons in a drop of water(20 drops=1ml) at 4 degree C  is

Asked by Anil 17th May 2017, 2:34 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

If 0.5 mole of BaCl2 is mixed with 0.2 mole of Na3PO4, the maximum no. of mole of NaCl that can be formed is

Asked by Anil 17th May 2017, 2:31 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How much K2Cr2O7(mol.wt.=294.19) is required to prepare 1L of 0.1 M solution in acid medium

Asked by Anil 17th May 2017, 2:28 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

If 8.3 ml of a sample of H2SO4(36N) is diluted by 991.7 ml of water, the approximate normality of resulting solution is

Asked by Anil 16th May 2017, 10:21 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What volume of 1M NaOH(in ml) will be required to react completely with 100 g of oleum which is 109% labelled

Asked by Anil 16th May 2017, 10:18 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

0.1914 g of an organic acid is dissolved in 20 ml of water,25 ml of 0.12 N NaOH is required for complete neutralisation of the acid solution. The equivalent weight of the acid is

Asked by Anil 16th May 2017, 10:16 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Concentration of glucose in blood is approximately 90 mg/100 ml. The molarity of glucose solution in blood is

Asked by Anil 16th May 2017, 10:11 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Calculate molarity of HCl of strength 1.17 g/ml

Asked by Anil 16th May 2017, 10:09 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

100 g CaCO3 reacts with 1L,1M HCl. How much CO2 will be obtained on complete reaction

Asked by Anil 16th May 2017, 10:07 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The ratio of amounts of H2S required to precipitate all the metal ionsfrom 100 ml. 1M AgNO3 and 100 ml 1M CuSO4 will be

Asked by Anil 16th May 2017, 10:04 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What volume of H2 at STP will be consumed in obtaining 21.6 g elemental boron from reduction of boron trichloride by hydrogen

Asked by Anil 16th May 2017, 3:40 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

If isobutane and n-butane are present in a gas, then how much oxygen should be required for complete combustion of 10 kg of this gas

Asked by Anil 16th May 2017, 3:36 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How many mole of H2O2 is required to produce sufficient oxygen which can be used to completely convert 2L at (STP) SO2 gas to SO3 gas

Asked by Anil 16th May 2017, 3:31 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

1.84 g mixture of CaCO3 and MgCO3 was heated to a constant weight till 0.96 g residue formed % MgCO3 in the sample was

Asked by Anil 13th May 2017, 9:53 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

A mixture of pure AgCl and AgBr contains 60.94% Ag by mass. What is the % of AgCl in sample

Asked by Anil 13th May 2017, 9:49 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

1 g mixture of cuprous and cupric oxides was reduced to 0.849 g metallic copper. What is the weight of cuprous oxide in sample

Asked by Anil 13th May 2017, 9:46 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

 What volume of H2 is evolved at S.T.P when 2.7 g aluminium reacts completely with aqueous NaOH

Asked by Anil 13th May 2017, 12:50 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What is volume of O2 required at 0oC and 1 atm to burn completely 1L propane gas

Asked by Anil 13th May 2017, 12:46 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

31.3 gram mixture NaBr and NaCl treated with H2SO4. 28.4 gram of Na2SO4 is produced. Then calculate the amount of NaCl and NaBr in the mixture.

Asked by Anil 13th May 2017, 12:32 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

 18.4 gram mixture of MgCO3 and CaCO3 produce 4.48 litre of CO2 at STP. Then calculate the amount of MgCO3 and CaCO3 in mixture

Asked by Anil 12th May 2017, 9:42 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

 Calculate the molality of aq. glucose solution in which mole fraction of glucose is 0.05

Asked by Anil 12th May 2017, 9:37 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

How many sulphur atom will be present in 2 litre of centi normal aq. solution of H2SO4                                           

Asked by Anil 12th May 2017, 9:34 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

 P and Q are two elements which form P2Q3 and PQ2. If 0.15 mole of P2Q3 weighs 15.9 g and 0.15 mole of PQ2 weighs 9.3 g, then what are atomic weights of P and Q

Asked by Anil 12th May 2017, 9:30 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What volume of H2 is liberated under similar conditions which released 2.24 dm3 O2 by electrolysis of water

Asked by Anil 12th May 2017, 2:37 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Air contains 20% O2 by volume. How many c.c. of air will be required for oxidation of 100 cc of acetylene

Asked by Anil 12th May 2017, 2:31 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

 How much oxygen is obtained from 90 kg of water

Asked by Anil 12th May 2017, 2:25 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The mass of BaCO3 produced when excess CO2 is bubbled through a solution of 0.205 mol BA(OH)2 is

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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Q)

Asked by araima2001 23rd March 2017, 9:56 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

a floride of oxygen was prepared by mixing oxygen and flourine in the proper ratio.This compound cantains 32.1%flourine and 67.9%oxygen. what is the empirical formula of the compound? (at. wt of f =19 and o=16)

Asked by nileshpatel19752000 19th September 2016, 6:05 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Fe2(SO4)+NH3+ H2O -----------  FE(OH)3+ (NH4)2SO4 
what is the answer after balancing 

Asked by farookhahmedkhan 10th August 2016, 5:14 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Write a short note on formula unit mass.

Asked by Topperlearning User 15th June 2016, 1:29 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What is the simplest formula of the compound which has the following percentage composition? Carbon 80% and Hydrogen 20%. If the molecular mass is 30, calculate its molecular formula.

Asked by Topperlearning User 15th June 2016, 1:27 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Dieldrin, an insecticide, contains C, H, Cl and O. Combustion of 29.72 mg of dieldrin gave 41.21 mg CO2 and 5.63 mg H2O. In a separate analysis 25.31 mg of dieldrin was converted into 57.13 mg AgCl. What is the empirical formula of dieldrin?

Asked by Balbir 9th May 2016, 9:07 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

1.  a mixture of oxalic acid and formic acid is heated with concentrated H2SO4  THE GAS EVOLVED IS COLLECTED AND ON TREATMENT WITH KOH SOLUTION the volume of solution decreases by 1/6. calculate the molar ratio of two acid in original mixture
 
 

Asked by patidarshm 11th December 2015, 11:38 AM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

The density of 3 M solutionof NaClis 1.25g/ml. Calculate molality of solution.

Asked by Sandeep 12th September 2015, 5:36 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

IS THERE ANY RELATION BETWEEN MOLARITY AND NORMALITY.

Asked by Aakash 19th April 2015, 4:43 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

IS WATER A MOLECULE OR A COMPOUND, IF SO, HOW?

Asked by koulrak2 19th April 2015, 12:41 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

What volume of 10M HCl should be diluted with water to prepare 2.00L of 5M HCl?

Asked by Topperlearning User 3rd March 2015, 1:27 PM
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CBSE - XI Science - Chemistry - Some Basic Concepts of Chemistry

Define molarity. What are its units? What is the effect of temperature on molarity of a solution?

Asked by Topperlearning User 3rd March 2015, 1:26 PM
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