What is the entropy change for the reaction given below,
2H2 (g) + O2 (g) 2H2O(l)
at temperature 300 K? Standard entropies of H2 (g), O2(g) and H2O(l) are 126.6, 201.20 and 68.0 JK-1mol-1 respectively.
1. -318.4 JK-1mol-1 .
2. 318.4 JK-1mol-1
3. 31.84 JK-1mol-1
4. none of these
If S for H2, Cl2 and HCl are 0.13, 0.22 and 0.19 kJ K-1mol-1 respectively. The total change in standard entropy for the reaction, H2 + Cl2 2HCl is:
1. 30 J K-1mol-1
2. 40 J K-1mol-1
3. 60 J K-1mol-1
4. 20 J K-1mol-1
Change in entropy is negative for:
1. Bromine (l)Bromine(g)
2. C(s) + H2O(g) CO(g) + H2(g)
3. N2(g,10 atm)N2(g,1 atm)
4. Fe ( 1mol, 400 K) Fe( 1mol, 300 K)
Which statements are correct?
1. is called Clausius-Clapeyron equation
2. is called Trouton's rule
3. Entropy is a measure of unavailable energy, i.e.,
unavailable energy = entropy x temperature
4. All of the above
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:
1. reversible process
2. cyclic process
3. isobaric process
4. spontaneous process
All the naturally occurring processes, i.e., spontaneous proceed spontaneously in a direction that leads to:
1. decrease of free energy
2. increase of free energy
3. decrease of entropy
4. increase of enthalpy
Entropy decreases during:
1. crystallization of sucrose from solution
2. rusting of iron
3. melting of ice
4. vaporization of camphor
The work done by a mass less piston in causing an expansion V (at constant temperature), when the opposing pressure, P is variable, is given by:
1. W=
2. W=0
3. W= -PV
4. none of these
At constant pressure and temperature, the direction of any chemical reaction is one where the...... decrease.
1. Entropy
2. Enthalpy
3. Gibbs energy
4. None of the above
According to the law, a perfect crystal's entropy is 0 at absolute zero, which is:
1. The first law
2. Second law
3. Third law
4. None of the above