The reaction

CH4(g) + Cl2(g)CH3Cl(g) + HCl(g)

has H=-25 K cal

From the given data, what is the bond enthalpy of Cl-Cl bond?

1. 70 K cal                                 2.  80 K cal

3.  67.75 K cal                           4. 57.85 K cal

Concept Questions :-

Enthalpy and It's Type
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In which case entropy decreases?

1. Boiling of egg

2. Combustion of benzene at 127°C

3. Stretching of rubber band

4. Dissolution of sugar in water

Concept Questions :-

Spontaneity and Entropy
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Which is correct at equilibrium?

1. H = 0              2. GTotal=0

3. STotal=0          4. E=0

Concept Questions :-

Gibbs Energy Change
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In which case heat of neutralization is greater than 13.7 K Cal?

1. HF & NH4OH              2. HCl & NaOH

3. HI & KOH                   4. HF & NaOH

Concept Questions :-

Thermochemistry
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Consider the reaction

N2(g) + 3H2(g)2NH3(g) carried out at constant temperature and pressure. If H and E are enthalpy change and internal energy change respectively, which of the following expression is True?

1.  HE                        2. H=E3.  H<E                        4. H>E

Concept Questions :-

Enthalpy and It's Type
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Which work done is maximum?

1. Isobaric work           2. Isothermal work

3. Isochoric work         4. Adiabatic work

Concept Questions :-

Thermodynamics' Properties and process
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For exothermic reaction to be spontaneous (S=negative)

1. Temperature must be high

2. Temperature must be zero

3. Temperature may have any magnitude

4. Temperature must be low

Concept Questions :-

Spontaneity and Entropy
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Which of the following conditions should be satisfied for the given reaction to be spontaneous at 0°C and 1 atm?

H2O(s) H2O(l)

Concept Questions :-

Spontaneity and Entropy
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'The free energy change due to a reaction is zero when

1. The reactants are initially mixed.

2.  A catalyst is added

3. The system is at equilibrium

4. The reactants are completely consumed

Concept Questions :-

Gibbs Energy Change
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An ideal gas expands at a constant external pressure of 2.0 atmosphere by 20 litre and absorbs 10kJ of heat from surrounding. What is the change in internal energy of the system:-

(1) 4052 J

(2) 5948 J

(3) 14052 J

(4) 9940 J

Concept Questions :-

First Law of Thermodynamics
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