The amount of heat required to raise the temperature of one mole of the substance through 1 K is called, its

1. Molar heat

2. Entropy

3. Thermal capacity

4. Specific heat

 

Subtopic:  Cp & Cv |
 69%
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At standard conditions, if the change in the enthalpy for the following reaction is –109 kJ mol-1 

H2(g)+Br2(g)2HBr(g)

Given that the bond energy of H 2 and Br 2 is 435 kJ mol-1 and 192 kJ mol-1, respectively, what is the bond energy (in kJ mol-1) of HBr?

(1) 368

(2) 736

(3) 518

(4) 259

Subtopic:  Thermochemistry |
 64%
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In a constant volume calorimeter 3.5g of a gas

(mol.wt.28) was burnt in excess O2 at 298 K. The

increase in temperature is 0.45 K due to combus-

tion, If Heat capacity of calorimeter is 2.5 kJ/K

the value of E is

1. 90 KJ/m

2. 9 kJ/m

3. 45 kJ/m

4. 18 kJ/m

Subtopic:  First Law of Thermodynamics |
 63%
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The free energy change (G°) is negative when -

1. The surroundings do no electrical work on the system.

2. The surroundings do electrical work on the system.

3. The system does electrical work on the surroundings.

4. The system does no electrical work on the surroundings.

Subtopic:  Gibbs Energy Change |
 60%
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Which of the following statement is true for G?

1. It is always proportional to H

2. It may be less than or greater than or equal to H

3. It is always greater than H

4. It is always less than H

Subtopic:  Gibbs Energy Change |
 81%
From NCERT
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The Gibbs free energy is defined as

1. G=H-T.S

2. G=H+T.S

3. G=E- T.S

4. G=E+ T.s

Subtopic:  Gibbs Energy Change |
 91%
From NCERT
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For which of the following changes 

HE?

1. H2+l2 2Hl

2. HCl +NaOHNaCl+H2O

3. C(s) +O2(g)  CO2(g) 

4.  N2+3H22NH3 

Subtopic:  2nd & 3rd Law of Thermodynamics |
 84%
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Standard molar enthalpy of formation of CO2 is equal to

1. Zero

2. The standard molar enthalpy of combustion of gaseous carbon.

3. The sum of standard molar enthalpies of formation Of CO and CO2

4. The standard molar enthalpy of combustion of carbon (graphite)

Subtopic:  Hess's Law |
 66%
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Which of the following statements is false?

1. Work is a state function.

2. Temperature is a state function.

3. Density is a state function.

4. Entropy is state function.

Subtopic:  Classification of System, Extensive & Intensive Properties |
 88%
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Which of the following is not an endothermic reaction?

1. Combustion of methane

2. Decomposition of water

3. Dehydrogenation of ethane or ethylene

4. Conversion of graphite to diamond

Subtopic:  Thermochemistry |
 69%
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