Thermodynamics Test

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Thermodynamics Test - 6

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Question 1
1 / -0

For the reaction at 298 K, 2A + B → C, ΔH = 400 kJ mol⁻¹and ΔS = 0.2 kJ K⁻¹mol⁻¹ .At what temperature will the reaction become spontaneous considering ΔH and ΔS to be constant over the temperature range.

A
3500 K

B
2000 K

C
2500 K

D
1500 K

Solution

Gibbs free energy, ΔG= ΔH-TΔS.

At equilibrium ΔG=0; then T= ΔH/ΔS = 2000K.

Therefore, above 2000K, the reaction will be spontaneuous.
Question 2
1 / -0

For the reaction, 2 Cl(g) → Cl2(g) , what are the signs of ΔH and ΔS?

A
ΔH > 0, ΔS > 0

B
ΔH < 0, ΔS < 0

C
ΔH < 0, ΔS > 0

D
ΔH > 0, ΔS < 0

Solution

As in this cas e bond formation between two Cl atom is taking place so energy will be released so ΔH<0 and since 2 atoms are combining to form 1 molecule randomness decreases so ΔS < 0.
Question 3
1 / -0

Thermodynamics is not concerned about

A
the rate at which a reaction proceeds.

B
the feasibility of a chemical reaction.

C
energy changes involved in a chemical reaction.

D
the extent to which a chemical reaction proceeds.

Solution

Thermodynamics tells that whether reaction will take place or not. It doesnot tell about the rate (speed) of reaction.
Question 4
1 / -0

Which of the following statements is correct?

A
The presence of reactants in a closed vessel made up of copper is an example of a closed system.

B
There is an exchange of energy as well as matter between the system and the surroundings in a closed system.

C
The presence of reacting species in a covered beaker is an example of open system.

D
The presence of reactants in a thermos flask or any other closed insulated vessel is an example of a closed system.

Solution

Since, matter will not exchange with surrounding but energy will exchange, so It will be a closed system.
Question 5
1 / -0

The state of a gas constant can be described by quoting the relationship between

A
temperature, amount, pressure

B
pressure, volume, temperature

C
pressure, volume, temperature, amount

D
amount, volume, temperature

Solution

State of gas constant is determined by stating the value of P,V,n,T.

i.e. R = PV/nT