Which is not a spontaneous process?

(a) Expansion of a gas into vacuum

(b) Water flowing downhill

(c) Heat flowing from colder body to a hotter body

(d) Evaporation of water from clothes during drying

Concept Questions :-

Spontaneity and Entropy
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All the naturally occurring processes, i.e., spontaneous proceed spontaneously in a direction which leads to:

(a) decrease of free energy                      (b) increase of free energy

(c) decrease of entropy                            (d) increase of enthalpy

Concept Questions :-

Spontaneity and Entropy
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When one mole of monoatomic ideal gas at TK undergoes reversible adiabatic change under a constant external pressure of 1 atm changes volume from 1 litre to 2 litre. The final temperature in kelvin would be:

(a) T/(2)2/3                                          (b) T + 2/(3x0.0821)

(c) T                                                    (d) T - 3/(2x0.0821)

Concept Questions :-

CP and CV and Relation for Real Gas
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A gaseous system changes from state A(P1, V1, T1) to B(P2,V2,T2), B to C(P3, V3, T3) and finally from C to A. The whole process may be called:

(a) reversible process                            (b) cyclic process

(c) isobaric process                               (d) spontaneous process

Concept Questions :-

Thermodynamics' Properties and process
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One mole of ice is converted into water at 273 K. The entropies of H2O(s) and H2O(l) are 38.20 and 60.01 J mol-1K-1 respectively. The enthalpy change for the conversion is:

(a) 59.54 J mol-1                                (b) 5954 J mol-1

(c) 595.4 J mol-1                              (d) 320.6 J mol-1

Concept Questions :-

Spontaneity and Entropy
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S° will be highest for the reaction:

(a) Ca(s) + 1/2 O2(g) CaO(s)

(b) CaCO3(s)CaO(s) + CO2(g)

(c) C(s) + O2(g)CO2(g)

(d) N2(g) + O2(g)2NO(g)

Concept Questions :-

Spontaneity and Entropy
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Which statements are correct?

(a) 2.303 logP2P1=Hvap.RT2-T1T1T2 is called Clausius-Clapeyron equation

(b) Hvap.Boiling Point=88 J mol-1K-1 is called Trouton's rule

(c) Entropy is a measure of unavailable energy, i.e.,

     unavailable energy = entropy x temperature

(d) All of the above

 

Concept Questions :-

Enthalpy and It's Type
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The mathematical form of the first law of thermodynamics when heat (q) is supplied and W is work done by the system (+ve) is:

(a) U=q+W                        (b) U=q-W

(c) U=-q+W                       (d) U= -q-W

Concept Questions :-

Internal Energy and work done
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Change in entropy is negative for:

(a) Bromine (l)Bromine(g)

(b) C(s) + H2O(g) CO(g) + H2(g)

(c) N2(g,10 atm)N2(g,1 atm) 

(d) Fe ( 1mol, 400 K)  Fe( 1mol, 300 K)

Concept Questions :-

Spontaneity and Entropy
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The internal energy change when a system goes from state A to B is 40 kJ/mol. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the change in internal energy?

(a) 40 kJ                                    (b) >40 kJ

(c) <40 kJ                                  (d) Zero

Concept Questions :-

Internal Energy and work done
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