Thermochemistry

 Identify the intensive quantities from the following:

Q: Identify the intensive quantities from the following:

(A) Enthalpy                                             

(B) Temperature

(C) Volume                                               

(D) Refractive index

Ans: (A)

The temperature of 5 ml of a strong acid increases by 5° C when 5 ml of a strong base is added to it. If 10 ml of each is mixed, temperature should increase by

Q: The temperature of 5 ml of a strong acid increases by 5° C when 5 ml of a strong base is added to it. If 10 ml of each is mixed, temperature should increase by

(A) 5° C

(B) 10° C

(C) 15° C

(D) Cannot be known

Ans: (A)

Which of the following has impossibilities of reaction of any temperature ?

Q: Which of the following has impossibilities of reaction of any temperature?

(A) ΔH > 0, ΔS < 0                                   

(B) ΔH > 0, ΔS > 0

(C) ΔH < 0, ΔS < 0                                   

(D) None

Ans: (B)

In which case, a reaction is possible at any temperature ?

Q: In which case, a reaction is possible at any temperature ?

(A) ΔH < 0, ΔS > 0

(B) ΔH < 0 , ΔS < 0

(C) ΔH > 0, ΔS > 0

(D) None

Ans: (A)

Which of the following corresponds to the definition of enthalpy of formation at 298 K?

Q: Which of the following corresponds to the definition of enthalpy of formation at 298 K?

(A) C(graphite) + 2H2(g) + 1/2 O2(l) →CH3OH(g)

(B)C(diamond) + 2H2(g) + 1/2 O2(g) →CH3OH (l)

(C) 2C(graphite) + 4H2(g) + 4H2(g) + O2(g) →2CH3OH (l)

(D) C(graphite) + 2H2(g) + 1/2 O2(g) →CH3OH(l)

Ans: (D)