JEE Main 2019 (Online) 11th January Morning Slot | Thermodynamics Question 125 | Chemistry

Two blocks of the same metal having same mass and at temperature T₁ and T₂, respectively, are brought in contact with each other and allowed to attain thermal equilibrium at constant pressure. The change in entropy, $$\Delta $$S, for this process is :

2C_p In $$\left[ {{{{{\left( {{T_1} + {T_2}} \right)}^{{1 \over 2}}}} \over {{T_1}{T_2}}}} \right]$$

2C_p In $$\left[ {{{\left( {{T_1} + {T_2}} \right)} \over {2{T_1}{T_2}}}} \right]$$

C_p In $$\left[ {{{{{\left( {{T_1} + {T_2}} \right)}^2}} \over {4{T_1}{T_2}}}} \right]$$

2C_p In $$\left[ {{{\left( {{T_1} + {T_2}} \right)} \over {4{T_1}{T_2}}}} \right]$$

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

The process with negative entropy change is :

Dissociation of CaSO₄ (s) to CaO(s) and SO₃(g)

Dissolution of iodine in water

Synthesis of ammonia from N₂ and H₂

Sublimation of dry ice

JEE Main 2019 (Online) 10th January Evening Slot

MCQ (Single Correct Answer)

-1

An ideal gas undergoes isothermal compression from 5m³ to 1 m³ against a constant external pressure of 4 Nm^–2. Heat released in this process is used to increase the temperature of 1 mole of Al. If molar heat capacity of Al is 24 J mol^–1 K^–1, the temperature of Al increases by :

$${2 \over 3}K$$

$${3 \over 2}K$$

1 K

2 K

JEE Main 2019 (Online) 10th January Morning Slot

MCQ (Single Correct Answer)

-1

A process has $$\Delta $$H = 200 J mol^–1 and $$\Delta $$S = 40 JK^–1 mol^–1. Out of the values given below, choose the minimum temperature above which the process will be spontaneous :

4 K

20 K

5 K

12 K

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