One mole of hydrogen gas at 25C and 1 atm pressure is heated at constant pressure until its volume has doubled. Given that Cv for hydrogen is 3.0 cal deg-1 mol-1, the H and E for this process are-

1. H = 1490 cal and E = 894 cal

2. H E= 1490 cal

3. H = 894 cal and E= 1490 cal

4. H E= 894 cal

Concept Questions :-

CP and CV and Relation for Real Gas
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The enthalpy change of the reaction

Al2Cl6s+6Nas2Als+6NaCls is -257 kcal.

Given the heat of formation of NaCl(s) is 98.0 kcal, the heat of formation of Al2Cl6s is-

1. 158 kcal

2. -331 kcal

3. -166 kcal

4. 316 kcal

Concept Questions :-

Thermochemistry
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Some of the thermodynamic parameters are state variables while some are process variables. Some grouping of the parameters are given. Choose the correct one-

1. State variables : Temperature, No. of moles

Process variables : Internal energy, work done by the gas

2. State variables : Volume, Temperature

Process variables : Internal energy, work done by the gas

3. State variables : work done by the gas, heat rejected by the gas.

Process variables : Temperature, volume

4. State variables : Internal energy, volume

Process variables : Work done by the gas, heat absorbed by the gas

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One mole of a real gas is subjected to heating at constant volume fromP1, V1, T1 state to P2, V2, T2 state. Then it is subjected to irreversible adiabatic compression against constant external pressure of P3 atm till syatem reaches the final stateP3, V3, T3. If the constant volume molar heat capacity of real gas is CV. Find out correct expression for H from state 1 to state 3-

1. CvT3-T1+P3V1-P1V1

2. CvT2-T1+P3V2-P1V1

3. CvT2-T1+P3V1-P1V1

4. CpT2-T1+P3V1-P1V1

Concept Questions :-

CP and CV and Relation for Real Gas
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H2g+12O2g=H2Og; H=241.8 kJCOg+12O2g=CO2g; H=283 kJ

The heat evolved in the combustion of 112 litres of water gas(mix of equal volumes of H2 and CO)

1. 241.8 kJ

2. 283 kJ

3. 1312 kJ

4. 1586 kJ

Concept Questions :-

Thermochemistry
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In which case of mixing of a strong acid and a base, each of 1(N) concentration, temperature-increase is the highest ?

1. 20 ml acid and 30 ml alkali

2. 10 ml acid and 40 ml alkali

3. 25 ml acid and 25 ml alkali

4. 35 ml acid and 15 ml alkali

Concept Questions :-

Thermochemistry
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The heats of neutralisation of four acids A, B, C and D are -13.7, -9.4, -11.2 and -12.4 kcal respectively when they are neutralised by a common base. The acidic character obeys the order :

1. A>B>C>D

2. A>D>C>B

3. D>C>B>A

4. D>B>C>A

Concept Questions :-

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The Hf for CO2(g), CO(g) and H2O(g) are -393.5, -110.5 and -241.8 kJ mol-1 respectively. The standard enthalpy change (in kJ) for the reaction,

CO2g+H2gH2Og is :

1. 524.21

2. 41.2

3. -262.5

4. -41.2

Concept Questions :-

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The dissociation energy of CH4 and C2H6 are respectively 360 and 620 Kcal/mole. The bond energy of C-C is-

1. 260 Kcal/mole

2. 180 Kcal/mole

3. 130 Kcal/mole

4. 80 Kcal/mole

Concept Questions :-

Thermochemistry
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For an endothermic reaction-

1. ProductsH=ReactantsH

2. ProductsH<ReactantsH

3. ProductsH>ReactantsH

4. ProductsH=0 but ReactantsH is positive.

Concept Questions :-

Enthalpy and It's Type
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