Chapter 13 : Practical Work - Selina Solutions for Class 10 Chemistry ICSE

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Chapter 13 - Practical Work Excercise Ex. 13

Question 1

(a)Give only one suitable chemical test to identify the following gases.

(i)Ammonia

(ii)Sulphur dioxide

(iii)Hydrogen Chloride

(iv)Chlorine

(v)Carbon Dioxide

(vi)Oxygen

(vii)Hydrogen

(b)Select a basic gas mentioned in Q.1 (a). How is the basic nature suspected?

(c)Select acidic gases from the gases mentioned in Q.1 (a). How is the acidic nature suspected?

(d)The two gases A and B are bleaching agents. A is greenish yellow and bleaches due to its oxidizing property while B is colourless gas that bleaches due to reduction. Identify A and B?

(e)Which gas turn blue cobalt chloride paper light pink?

Give one similarity in test between (i)Cl2 and HCl (ii) SO2 and CO2.

Solution 1

(a)(i) Chemical test for ammonia:

If a rod dipped in concentrated hydrochloric acid is brought near ammonia gas, dense white fumes of ammonium chloride (NH4Cl) are formed.

 

(ii) Chemical test for Sulphur dioxide:

It decolorizes pink coloured potassium permanganate solution.

 

(iii) Chemical test for HCl:

When HCl gas is passed through AgNO3 solution, white precipitates of AgCl are formed which gets dissolved in excess of NH4OH.

 

(iv) Chemical test for Chlorine:

It turns moist starch iodide paper (KI + starch solution) blue black.

 

(v) Chemical test for Carbon dioxide:

When this gas is passed through lime water, it turns milky due to the formation of white precipitates of CaCO3 and on passing excess of carbon dioxide gas, this milkiness disappears.

 

(vi) Chemical test for oxygen:

This gas is absorbed in colourless alkaline solution of pyrogallol and turns it dark brown.

 

(vii)Chemical test for hydrogen:

It burns with a pop sound when a burning taper is brought near it.

 

(b)Ammonia is a basic gas and its basic nature is suspected through litmus paper test because it changes the colour of red litmus paper to blue.

 

(c)Chlorine, carbon dioxide, hydrogen chloride, hydrogen sulphide and sulphur dioxide are acidic gases since they convert blue litmus to red.

 

(d)A is chlorine and B is Sulphur dioxide.

 

(e)Water vapour.

Question 2

  Name the gases which

       a)Extinguishes burning wooden splinter.

       b)Turns moist red litmus blue.

       c)Do not effect moist litmus.

       d)Affects the acidified K2Cr2O7 paper and also turns lime water dirty milky.

Solution 2

(a)O2

(b)NH3

(c)Water vapour

(d)SO2

Question 3

Name:

(a) Two carbonates which do not produce carbon dioxide on heating.

(b) A colourless gas which bleaches.

(c) Gases which has sour taste.

(d) Greenish yellow gas which also bleaches.

(e) Gas with rotten egg smell.

Solution 3

(a) Na2CO3 and K2CO3

(b) SO2

(c) CO2

(d) Cl2

(e) H2S

Question 4

From the following list of substances choose those which meet the description given in the part (a) below. Ammonium chloride, ammonium nitrate, chlorine, dilute hydrochloric acid, iron, lead nitrate, manganese (IV) oxide, silver nitrate, sodium nitrate, sodium nitrite and sulphur.

Two compounds whose aqueous solutions give white precipitates with dilute hydrochloric acid.

Solution 4

Silver nitrate and ammonium nitrate.

Question 5

Name the anion present in each of the following compounds:

(a) Compound A when warmed with concentrated sulphuric acid gives a gas which fumes in moist air and which gives dense white fumes with ammonia.

(b) When barium chloride solution is added to a solution of compound B, a white precipitate insoluble in dilute hydrochloric acid is formed.

(c) The action of heat on the insoluble compound C produces a gas which turns lime water turbid.

(d) Compound D when warmed with dilute sulphuric acid gives a gas which turns acidified dichromate solution green.

Solution 5

(a) Cl-

(b) SO42-

(c) CO32-

(d) SO32-

Question 6

A given white crystalline salt was tested as follows:

(a) It dissolved in water and the resulting solution of the salt turned blue litmus red.

(b) Addition of barium chloride solution into this solution gave a white precipitate.

(c) A flame test on the salt gave a persistent golden-yellow colourisation.

What conclusions can be drawn for each observation?

Solution 6

(a) Since the salt solution turned blue litmus red hence the salt may be an acid.

(b) Since addition of barium chloride into the solution of salt gave white precipitate so the salt may contain SO42-, SO32-, CO32- anion.

(c) The flame test of the salt gives persistent golden yellow colourisation which suggests presence of Na+ ion.

Question 7

(a) Sodium hydroxide solution is added to solution A. A white precipitate is formed which is insoluble in excess sodium hydroxide solution. What is metal ion present in solution A?

(b) When ammonium hydroxide solution is added to solution B, a pale blue precipitate is formed. This pale blue precipitate dissolves in excess ammonium hydroxide giving an inky blue solution. What is the cation present in solution B?

(c) When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.

Solution 7

                  

          (a) Ca2+

          (b) Cu

          (c) The three ways are:

          i. Ammonia gas turns moist red litmus blue.

          ii. If a rod dipped in concentrated HCl is brought near the gas, dense white fumes of NH4Cl are formed.

          iii. The gas turns colourless Nessler's reagent i.e. K2HgI4 brown.

Question 8

Complete the following table and write your observations.

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

Shake the gas with blue litmus solution

Apply a burning splint to a gas

Solution 8

Hydrogen sulphide

Ammonia

Sulphur dioxide

Hydrogen chloride

Shake the gas with red litmus solution

No change in the colour of litmus solution

Red litmus solution becomes blue in colour.

No change in the colour of litmus solution

No change in the colour of litmus solution

Shake the gas with blue litmus solution

Blue litmus solution becomes red in colour.

No change in the colour of blue litmus solution.

Blue litmus solution becomes red in colour.

Blue litmus solution becomes red in colour

Apply a burning splint to a gas

No reaction.

No reaction.

No reaction.

No reaction.

Question 9

Use the information given in (a) to (h) to identify the substances P to W selecting your answers from the given list.

List: Calcium Oxygen Copper (II) Oxide

Carbon Calcium hydroxide Copper (II) Nitrate

Lead (II) Oxide Hydrogen chloride Chlorine

Lead (II) Nitrate Calcium Oxide Ammonium chloride

(a) P is white solid. When heated produces white fumes (sublime).

(b) P and R on warming produce an alkaline gas.

(c) On adding water to T, heat is evolved and R is formed.

(d) Q burns brightly in air to form T.

(e) When S is heated, it gives off brown fumes and leaves a black residue of U.

(f) A solution of S is formed by warming U with dilute nitric acid.

(g) V is a gaseous non metallic element that reacts with hydrogen to form W.

(h) A solution of W will neutralize the solution of R.

Solution 9

(P) Ammonium chloride

(Q) Calcium

(R) Calcium hydroxide

(S) Lead (II) Nitrate

(T) Calcium Oxide

(U) Lead (II) Oxide

(V) Chlorine

(W) Hydrogen chloride

Question 10

Copy and complete the following table which refers to the action of heat on some carbonates:

Carbonate

Colour of residue on cooling

Zinc Carbonate

Lead Carbonate

Copper Carbonate

Solution 10

Carbonate

Colour of residue on cooling

Zinc Carbonate

white

Lead Carbonate

yellow

Copper Carbonate

black

Question 11

Distinguish by a chemical test,

(i)Sodium carbonate and sodium sulphite

(ii)Sodium chloride and sodium sulphite

(iii)Sodium hydroxide solution and ammonium hydroxide solution.

(iv)Ammonium sulphate and sodium sulphate

(v) Sulphuric acid from nitric acid and hydrochloric acid.

Solution 11

(i)Sodium carbonate and sodium sulphite can be distinguished by using acidified K2Cr2O7:

Take a small quantity of salt in a test tube; add dil. H2SO4.and warm if necessary. Now if on bringing a filter paper moistened with acidified K2Cr2O7 near the gas evolved, the orange colour of the paper turns green then it is sodium sulphite.

(ii)Sodium thiosulphate and sodium sulphite:

The salts can be distinguished by using silver acetate. To the salt silver acetate and dil. HNO3 are added. If there is formation of a white precipitate which slowly turns black then it is thiosulphate anion since silver acetate forms Ag2S2O3 which being unstable in acid solution gets converted to black Ag2S.

(iii)Sodium hydroxide solution and ammonium hydroxide solution:

These salts can be distinguished by using a metal cation like calcium. When we add calcium salt to sodium hydroxide and ammonium hydroxide, then a white curdy ppt. is formed only in case of sodium hydroxide.

(iv)Ammonium sulphate and sodium sulphate:

These salts can be distinguished by using KOH. When KOH is added to ammonium sulphate, ammonia gas is evolved. Whereas there is no evolution of ammonia gas in case of sodium sulphate.

(v)Add barium chloride solution to sulphuric acid, nitric acid and hydrochloric acid. A white precipitate is formed in dilute sulphuric acid, and no such precipitate is formed in nitric acid and hydrochloric acid.

BaCl2(aq)  + H2SO4(aq) → BaSO4(s) + 2HCl(aq)

Question 12

Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solution of copper (II) sulphate, zinc nitrate, lead nitrate, calcium chloride and iron (III) sulphate. Copy of the following table and write the colour of the precipitate in (i) to (v) and the nature of the precipitate (soluble or insoluble) in (vi) to (x).

 

Aqueous salt solution

Colour of the precipitate when NaOH is added in small quantity

Nature of the(soluble or insoluble) when NaOH is added in excess

copper (II) sulphate

zinc nitrate

lead nitrate

calcium chloride

Iron (III) sulphate

(i)

 

(ii)

(iii)

(iv)

(v)

 

 

(vi)

 

(vii)

(viii)

(ix)

(x)

 

Solution 12

Aqueous salt solution

Colour of the precipitate when NaOH is added in small quantity

Nature of the(soluble or insoluble) when NaOH is added in excess

copper (II) sulphate

zinc nitrate

 

lead nitrate

calcium chloride

iron (III) sulphate

(i)Pale blue

 

(ii) White gelatinous

(iii)White chalky

(iv)White curdy

(v) Reddish brown

 

(vi)Insoluble

 

(viii)Soluble

 

(viii)Soluble

(ix)Insoluble

(x)Insoluble

Question 13

State your observation when:

(a)Lead nitrate solution and sodium chloride solution are mixed.

(b)Zinc chloride solution, zinc nitrate solution and zinc sulphate solutions are added individually to

(i)Barium chloride solution

(ii)Lead nitrate solution.

(c) Decomposition of bicarbonates by dil. H2SO4

2NaHCO3 + H2SO4 → NaSO4 + 2H2O + 2CO2

2KHCO3 + H2SO4 → K2SO4 + 2H2O + 2CO2

Solution 13

(a)Lead chloride as precipitate and sodium nitrite are formed.

(b)

 

Zinc chloride

Zinc nitrate

Zinc sulphate

Barium chloride

No reaction

No reaction

White ppt. is obtained

Lead nitrate

No reaction

No reaction

No reaction

(c)Dilute sulphuric acid liberates carbon dioxide from metallic carbonates and bicarbonates. Carbon dioxide when bubbled into a test tube containing calcium hydroxide solution turns it milky.

Question 14

      The questions (i) to (v) refer to the following salt solutions listed A to F.

           A.Copper Nitrate

           B.Iron (II) Sulphate

           C.Iron (III) chloride

           D.Lead Nitrate

           E.Magnesium sulphate

          F.Zinc chloride

 

(I)Which two solutions will give a white precipitate when treated with dilute hydrochloric acid followed by barium chloride solution?

(II)Which two solutions will give a white precipitate when treated with dilute nitric acid followed by sliver nitrate solution?

(III)Which solution will give white precipitate, when either dilute hydrochloric acid or dilute sulphuric acid is added to it?

(IV)Which solution becomes a deep/inky blue colour when excess of ammonium hydroxide is added to it?

(V)Which solution gives a white precipitate with excess of ammonium hydroxide solution?

Solution 14

(I)Iron (II) Sulphate and Magnesium sulphate

(II)Iron (III) chloride and Zinc Chloride

(III)Lead nitrate

(IV)Copper nitrate.

(V)Lead nitrate.

Question 15

Mention the colour changes observed when the following indicators are added:

Solution

Acids

Alkalies

(a) Alkaline phenolphthalein solution

(b) Methyl orange solution

(c) Neutral litmus solution

 

 

 

Solution 15

 

Solution

Acids

Alkalies

(a) Alkaline phenolphthalein solution

(b) Methyl orange solution

(c) Neutral litmus solution

Colourless

Pink

Red

Pink

Yellow

Blue

 

Question 16

Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.

(a)When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.

(b)Addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black paper.

(c)When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test-tube, a brown ring is formed.

(d)When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.

(e)Addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.


Solution 16

Salt

Anion

A

Cl-

B

S2-

C

NO3-

D

SO32-

E

CO32-

Question 17

(a) The salt which in solution gives a pale green precipitate with sodium hydroxide solution and a white precipitate with barium chloride solution is:

(i) Iron (III) sulphate      (ii) Iron (II) sulphate

(iii) Iron (II) chloride       (iv) Iron (III) chloride

 

(b) Identify the following substances:

(i) An alkaline gas A which gives dense white fumes with hydrogen chloride.

(ii) A dilute acid B which does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper.

(iii) Gas C has an offensive smell like rotten eggs

(iv) Gas D is a colourless gas which can be used as a bleaching agent

(v) Liquid E can be dehydrated to produce ethene

Solution 17

(a) (ii) Iron[II] sulphate

(b) (i) Gas A is ammonia gas.

     (ii) Acid B is nitric acid.

     (iii) Gas C is hydrogen sulphide.

     (iv) Gas D is sulphur dioxide.

     (v) Liquid E is ethanol.

Question 18

(a) Carbon dioxide and sulphur dioxide gas can be distinguished by using

(i) Moist blue litmus paper

(ii) Lime water

(iii) Acidified potassium dichromate paper

(iv) None of the above

(b) Identify the substance 'R' based on the information given below:

The pale green solid 'R' turns reddish brown on heating. Its aqueous solution gives a white precipitate with barium chloride solution. The precipitate is insoluble in mineral acids.

(c) Give one chemical test to distinguish between the following pairs of compounds.

(i) Zinc sulphate soln. and zinc chloride soln.

(ii) Iron (II) chloride soln. and iron (III) chloride soln.

(iii) Calcium nitrate soln. and calcium chloride soln.

Solution 18

(a) (iii) Acidified potassium dichromate paper

 

(b) R is ferrous sulphate.

 

(c)

i. When BaCl2 solution is added to the given solution, ZnSO4 gives a white ppt. of barium sulphate, while no ppt. is obtained with ZnCl2 solution.

 

ii. When NaOH solution is added to the given solution, iron (II) chloride gives a dirty green ppt. of ferrous hydroxide, while reddish brown ppt. of iron(III) hydroxide is obtained with iron (III) chloride.

 

iii. When AgNO3 solution is added to the given solution, CaCl2 solution gives a white ppt., while no change is observed with calcium nitrate solution.

Question 19

(a) Select the correct answer from A, B, C and D.

A. Nitroso iron (II) sulphate

B. Iron (III) chloride

C. Chromium sulphate

D. Lead (II) chloride.

(i) The compound which is responsible for the green colour formed when SO2 is bubbled through acidified potassium dichromate solution.

(ii) Compound responsible for brown ring.

(b) State your observation

(i) A piece of moist blue litmus paper.

(ii) Paper soaked in potassium permanganate solution is introduced in each case into a jar of sulphur dioxide.

(c) Write the equation for the reaction of magnesium sulphate solution with barium chloride solution.

Solution 19

(a)

(i) C. Chromium sulphate

(ii) A. Nitroso iron (II) sulphate

(b) (i) Litmus turns blue to red, and then gets bleached.

     (ii) Paper turns from pink to white.

(c) MgSO4 + BaCl2 MgCl2 + BaSO4

Question 20

(a) Choose from the list of substances - Acetylene gas, aqua fortis, coke, brass, barium chloride, bronze, platinum.

An aqueous salt solution used for testing sulphate radical

Solution 20

(a) Barium chloride

Question 21

(a) Name the gas which turns acidified potassium dichromate solution green.

(b) Identify the anion present in the following compounds.

(i) Compound X on heating with copper turnings and conc. sulphuric acid liberates a reddish brown gas.

(ii) When a solution of compound Y is treated with silver nitrate solution, a white precipitate is obtained which is soluble in excess of ammonium hydroxide solution.

(iii) Compound Z which on reacting with dilute sulphuric acid liberates a gas which turns lime water milky, but the gas has no effect on acidified potassium dichromate solution.

(iv) Compound L on reacting with barium chloride solution gives a white precipitate insoluble in dilute hydrochloric acid or dilute nitric acid.

(c) State one chemical test between each of the following pairs:

(i) Sodium carbonate and sodium sulphite

(ii) Ferrous nitrate and lead nitrate

(iii) Manganese dioxide and copper (II) oxide

(d) State your observation: A zinc granule is added to copper sulphate solution.

(e) Give balanced equation for the reaction: Silver nitrate solution and sodium chloride solution

Solution 21

(a) Sulphur dioxide

(b) (i) Nitrate ion, NO3-

     (ii) Chloride ion, Cl-

      (iii) Carbonate ion, CO32-

     (iv) Sulphate ion, SO42-

(c)

i. On adding dil. sulphuric acid to sodium carbonate, a colourless and odourless gas is evolved which has no action on acidified potassium dichromate paper.

Na2CO3+ H2SO4→ Na2SO4+ H2O + CO2

Sodium sulphite on adding dil. sulphuric acid liberates a colourless gas having burning sulphur smell and turns acidified potassium dichromate paper from orange to green.

Na2SO3 + H2SO4 Na2SO4 + H2O + SO2

K2Cr2O7 + 3SO2 + H2SO4 → K2SO4 + Cr2(SO4)3 + H2O

(Orange)                                   (Green)

ii. Ferrous nitrate on reaction with little NaOH produces a dirty green precipitate which is insoluble in excess. Lead nitrate on reaction with little NaOH produces white precipitate which is soluble in excess.

iii. Add a little dil. sulphuric acid to copper oxide and manganese dioxide and heat gently. The copper oxide reacts to produce a blue solution of copper sulphate. The manganese dioxide gives a colourless solution.

CuO + H2SO4→ CuSO4 + H2O

                        (Blue)

MnO2 + 2H2SO4→MnSO4 + 2H2O

                             (Colourless)

 

(d) The blue colour of copper sulphate solution discharge and a reddish brown layer of copper are seen.

(e) AgNO3 + NaCl → AgCl + NaNO3

Question 22

(a) Give a chemical test to distinguish between

(i) Sodium chloride soln. and sodium nitrate soln.

(ii) Hydrogen chloride gas and hydrogen sulphide gas

(iii) Calcium nitrate soln. and zinc nitrate soln.

(iv) Carbon dioxide gas and sulphur dioxide gas

(b) Which one of the following will not produce an acid when made to react with water?

     (i) Carbon monoxide   (ii) Carbon dioxide

     (iii) Nitrogen dioxide   (iv) Sulphur trioxide

Solution 22

(a)

i. Add silver nitrate solution to both solutions. Sodium chloride will form a curdy white ppt., whereas sodium nitrate will not undergo any reaction.

ii. Hydrogen chloride gas gives thick white fumes of ammonium chloride when a glass rod dipped in ammonia solution is held near the vapour of the acid, whereas no white fumes are observed in case of hydrogen sulphide gas.

iii. Calcium nitrate forms no ppt. even with addition of excess of NH4OH, whereas zinc nitrate forms a white gelatinous ppt. which dissolves in excess of NH4OH.

iv. Carbon dioxide gas has no effect on acidified KMnO4 or K2Cr2O7, but sulphur dioxide turns potassium permanganate from pink to colourless.

(b) (i) Carbon monoxide

Question 23

(a) Distinguish between

      Sodium nitrate and sodium sulphite [Using dilute sulphuric acid]

(b) State your observation: When moist starch iodide paper is introduced into chlorine gas.

(c) The flame test with a salt P gave a brick red flame. What is the cation in P?

(d) A gas Q turns moist lead acetate paper silvery black. Identify the gas Q.

(e) pH of liquid R is 10. What kind of substance is R?

Solution 23

(a) Sodium nitrate on treatment with dilute sulphuric acid gives sodium bisulphate and nitric acid.

     NaNO3 + H2SO4 →NaHSO4 + HNO3

Sodium sulphite on treatment with dilute sulphuric acid gives sodium sulphate and sulphur dioxide.

     Na2SO3 + H2SO4 → Na2SO4 + H2O + SO2

(b) When moist starch iodide paper is introduced into chlorine gas, chlorine oxidises iodide to iodine, which shows up as blue when complexed with starch.

(c) On carrying out the flame test with a salt P, a brick red flame is obtained. Hence, the cation P is Ca2+.

(d) Gas Q turns moist lead acetate paper silvery black. Hence, the gas is H2S.

(e) pH of liquid R is 10. Hence, substance R is a base.

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