ldentify the correct statement regarding entropy.

(1) At absolute zero temperature, entropy of a perfectly crystaline

     substance is +ve.

(2) At absolute zero temperature, entropy of a perfectly crystalline

     substance is taken to be zero 

(3) At absolute zero temperature, entropy of all crystaline sustances

     in taken to be 0.

(4) At 0° C entropy of a perfectly crystalline substance is taken to

      be 0.

Subtopic:  Spontaneity & Entropy |
 77%
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The reaction that has a value of S° greater than zero among the following is-

\( \begin{align} & {{1}{.}\;{CaO}\left({s}\right){+}{CO}_{2}\rightarrow{CaCO}_{3}\left({s}\right)}\\ & {{2}{.}\;{NaCl}\left({aq}\right)\rightarrow{NaCl}\left({s}\right)}\\ & {{3}{.}\;{NaNO}_{3}\left({s}\right)\rightarrow{Na}^{{+}}\left({aq}\right){+}{NO}_{3}^{{-}}\left({aq}\right)}\\ & {{4}{.}\;{N}_{2}\left({g}\right){+}{3}{H}_{2}\left({g}\right)\rightarrow{2}{NH}_{3}\left({g}\right)} \end{align}\)

Subtopic:  Spontaneity & Entropy |
 79%
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The net work done for an ideal gas is given as 

1. -3PV

2. 3PV

3. PV

4. Zero

Subtopic:  First Law of Thermodynamics |
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For a spontaneous process, the correct statement is 

1. Entropy of the system always increases

2. Free energy of the system always increases 

3. Total entropy change is always negative 

4. Total entropy change is always positive

Subtopic:  Spontaneity & Entropy |
 62%
From NCERT
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Which one of the following has the maximum entropy of vaporization?

1. water (l) 

2. toluene (l)

3. diethyl ether (l) 

4. acetone (l) 

Subtopic:  Spontaneity & Entropy |
 58%
From NCERT
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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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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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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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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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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%
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