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CBSE Class 11-science Answered

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Asked by prakriti12oct | 27 Sep, 2019, 01:43: AM
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Standard enthalpy of formation is zero of the elements in their standard state. Chlorine exists in Cl2(g) form in nature So it is standard form of Chlorine so the standard formation of heat will be zero. In other cases, Hg exists in liquid form, Br2  exists in liquid and  I2   exists in solid form in nature, so the standard enthalpy of formation cannot be zero for other given elements.
Answered by Ravi | 27 Sep, 2019, 07:34: PM

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CBSE 11-science - Chemistry
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CBSE 11-science - Chemistry
a steel fiber is in a oxygen filled container which is closed with a frictionless piston. the iron in the steel fiber reacts with oxygen to form Fe2O3 , the heat generated by the reaction is removed during the process to maintain the temperature constant which is 25 degrees centigrade. for the reaction of 2 moles of iron 831.08KJ of heat is removed. calculate the heat , work and internal energy of change of the system
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CBSE 11-science - Chemistry
How to solve this Question?
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Asked by varakalasuchi3 | 28 Mar, 2020, 04:47: PM
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CBSE 11-science - Chemistry
When 100ml of strong acid mixed with 100ml of strong base, change in temperature is 5°c. Determine the change in temperature when 10ml of strong acid mixed with strong base.
Asked by patra04011965 | 09 Nov, 2019, 12:18: PM
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CBSE 11-science - Chemistry
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Asked by prakriti12oct | 27 Sep, 2019, 01:43: AM
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CBSE 11-science - Chemistry
How is isothermal irreversible expansion cyclic  and how is delta H=0 for the process?
Asked by prakriti12oct | 26 Sep, 2019, 01:40: AM
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CBSE 11-science - Chemistry
The transition Sn(s, gray) ⇌ Sn(s, white) is in equilibrium at 18°C and 1 atm pressure. If ΔS = 8.811K mol for the transition at 18°C and if the densities are 5.75 g/cm3 for gray tin and 7.28 g/cm3 for white tin, calculate the transition temperature under 100 atm pressure
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Asked by sayantan.chem2 | 06 Aug, 2019, 05:07: PM
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CBSE 11-science - Chemistry
6.63 sum
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Asked by lovemaan5500 | 21 Jan, 2019, 06:37: AM
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CBSE 11-science - Chemistry
One mole of anhydrous MgCl2 dissolves in water and librates 25 cal/mol of heat. ∆Hhydration of MgCl2 = –30 cal/mol. Heat of dissolution of MgCl2.7H2O(s) is :- (1) +5 cal/mol (2) –5 cal/mol (3) 55 cal/mol (4) –55 cal/mol
Asked by Atulcaald | 25 May, 2018, 12:24: AM
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