If a process is both endothermic and spontaneous, then :

1. $∆S>0$

2. $∆S<0$

3. $∆H<0$

4. $∆G>0$

Concept Questions :-

Gibbs Energy Change
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Difficulty Level:

The bond energies of C=C and C-C at 298 K are 590 and 331 kJ mol-1 respectively. The enthalpy of polymerization per mole of ethylene is

1. -70 kJ

2. -72 kJ

3. 72 kJ

4. -68 kJ

Concept Questions :-

Thermochemistry
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Difficulty Level:

1 mole of NH3 gas at ${27}^{\circ }C$ is expanded adaibatic condition to make volume 8 times ($\gamma$=1.33). Final temperature and work done respectively are-

1. 150 K, 900 cal

2. 150 K, 400 cal

3. 250 K, 1000 cal

4. 200 K, 800 cal

Concept Questions :-

CP and CV and Relation for Real Gas
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Difficulty Level:

Which of the following statements is correct with regard to $∆$G of a cell reaction and EMF of the cell (E) in which the reaction occurs ?

(A) Both $∆$G and E are extensive properties

(B) $∆$G is an intensive property but E is an extensive property

(C) $∆$G is an extensive property and E is an intensive property

(D) Both $∆$G and E are intensive properties.

Concept Questions :-

Extensive and Intensive Properties
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Difficulty Level:

Temperature of 1 mol of a gas is increased by ${1}^{\circ }$ at constant pressure. Work done is-

1. R

2. 2R

3. R/2

4. 3R

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Difficulty Level:

When 0.16 g of glucose was burnt in a bomb calorimeter, the temperature rose by 4 deg. Calculate the calorimeter constant (water equivalent of the calorimeter) given that  [molar enthalpy of combustion]. Molar mass of glucose = 180 mol-1.

1.

2.

3.

4.

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Difficulty Level:

The C-Cl bond energy can be calculated from :

1.

2.

3.

4.

High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:

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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Difficulty Level:

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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Difficulty Level:

$∆H$ 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