JEE Main 2017 (Online) 9th April Morning Slot | Thermodynamics Question 139 | Chemistry

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

A gas undergoes change from state A to state B. In this process, the heat absorbed and work done by the gas is 5 J and 8 J, respectively. Now gas is brought back to A by another process during which 3 J of heat is evolved. In this reverse process of B to A :

10 J of the work will be done by the gas.

6 J of the work will be done by the gas.

10 J of the work will be done by the surrounding on gas.

6 J of the work will be done by the surrounding on gas.

JEE Main 2017 (Online) 9th April Morning Slot

MCQ (Single Correct Answer)

-1

An ideal gas undergoes isothermal expansion at constant pressure. During the process :

enthalpy increases but entropy decreases.

enthalpy remains constant but entropy increases.

enthalpy decreases but entropy increases.

Both enthalpy and entropy remain constant.

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

For a reaction, A(g) $$ \to $$ A($$\ell $$); $$\Delta $$H= $$-$$ 3RT.
The correct statement for the reaction is :

$$\Delta $$H = $$\Delta $$U $$ \ne $$ O

$$\Delta $$H = $$\Delta $$U = O

$$\left| {} \right.$$$$\Delta $$H$$\left| {} \right.$$ < $$\left| {} \right.$$$$\Delta $$U$$\left| {} \right.$$

$$\left| {} \right.$$$$\Delta $$H$$\left| {} \right.$$ > $$\left| {} \right.$$$$\Delta $$U$$\left| {} \right.$$

JEE Main 2017 (Online) 8th April Morning Slot

MCQ (Single Correct Answer)

-1

The enthalpy change on freezing of 1 mol of water at 5^oC to ice at −5^oC is :

(Given $$\Delta $$_fusH = 6 kJ mol^$$-$$1 at 0^oC,
C_p(H₂O, $$\ell $$ = 75.3J mol^$$-$$1 K^$$-$$1)
C_p(H₂O s) =36.8 J mol^$$-$$1 K^$$-$$1)

5.44 kJ mol^$$-$$1

5.81 kJ mol^$$-$$1

6.56 kJ mol^$$-$$1

6.00 kJ mol^$$-$$1

PREVIOUS NEXT

JEE Main Subjects