The C-Cl bond energy can be calculated from :

1.

2.

3.

4.

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Given $∆{{H}^{\circ }}_{f}$ of DyCl3 (s) = -994.30 kJ mol-1

1. -966.5 kJ/mol

2. -699.43 kJ/mol

3. -596.6 kJ/mol

4. -569.6 kJ/mol

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1 g H2 gas at S.T.P is expanded so that volume is doubled. Hence work done is:

1. 22.4 L atm

2. 5.6 L atm

3. 11.2 L atm

4. 44.8 L atm

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$∆H$ for the reaction 2C(s) + 3H2(g)$\to$C2H6(g) is -20.24 kcal/mol. To what value of the enthalpy of sublimation of C(s) does this point given that the bond energies of C-C, C-H and H-H are 63 kcal/mol, 85.6 kcal/mol and 102.6 kcal/mol.

1. 124.3 kcal/mol

2. 185.3 kcal/mol

3. 158.3 kcal/mol

4. 211.5 kcal/mol

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The gas absorbs 100 J heat and is simultaneously compressed by a constant external pressure of 1.50 atm from 8 lit. to 2 lit. in volume. Hence $∆E$ will be-

1. -812 J

2. 812 J

3. 1011 J

4. 911 J

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If $∆G=∆H-T∆S$ and $∆G=∆H+T{\left(\frac{d\left(∆G\right)}{dT}\right)}_{P}$ then variation of EMF of a cell E, with temperature T, is given by

1. $\frac{∆H}{nF}$

2. $\frac{∆G}{nF}$

3. $\frac{∆S}{nF}$

4. $-\frac{∆S}{nF}$

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The standard heat of combustion of Al is -837.8 kJ mol-1 at ${25}^{\circ }C$ which of the following releases 250 kcal of heat ?

1. The reaction of 0.624 mol of Al

2. The formation of 0.624 mol of Al2O3

3. The reaction of 0.312 mol of Al

4. The formation of 0.150 mol of Al2O3

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${C}_{P}-{C}_{V}=R$. This R is :

1. Change in K.E.

2. Change in rotational energy

3. work done which system can do on expanding the gas per mol per degree increase in temperature

4. All correct

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Heat of neutralisation of oxalic acid is -25.4 K cal mol-1 using strong base, NaOH. Hence enthalpy change of the process is is-

1. 2.0 kcal

2. -11.8 kcal

3. 1.0 kcal

4. -1.0 kcal

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5 moles of nitrogen gas are enclosed in an adiabatic cylindrical vessel. The piston itself is a rigid light cylindrical container containing 3 moles of Helium gas. There is a heater which gives out a power 100 cal to the nitrogen gas. A power of 30 cal is transferred to Helium through the bottom surface of the piston.

The rate of increment of temperature of the nitrogen gas assuming that the piston moves slowly :

1. 2K/sec

2. 4K/sec

3. 6K/sec

4. 8K/sec

Concept Questions :-

CP and CV and Relation for Real Gas