JEE Main 2022 (Online) 25th June Evening Shift | Thermodynamics Question 68 | Chemistry

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

At 25$$^\circ$$C and 1 atm pressure, the enthalpy of combustion of benzene (I) and acetylene (g) are $$-$$ 3268 kJ mol^$$-$$1 and $$-$$1300 kJ mol^$$-$$1, respectively. The change in enthalpy for the reaction 3 C₂H₂(g) $$\to$$ C₆H₆ (I), is :

+324 kJ mol^$$-$$1

+632 kJ mol^$$-$$1

$$-$$ 632 kJ mol^$$-$$1

$$-$$ 732 kJ mol^$$-$$1

JEE Main 2022 (Online) 24th June Evening Shift

MCQ (Single Correct Answer)

-1

At 25$$^\circ$$C and 1 atm pressure, the enthalpies of combustion are as given below :

Substance	$${H_2}$$	C (graphite)	$${C_2}{H_6}(g)$$
$${{{\Delta _c}{H^\Theta }} \over {kJ\,mo{l^{ - 1}}}}$$	$$ - 286.0$$	$$ - 394.0$$	$$ - 1560.0$$

The enthalpy of formation of ethane is

+54.0 kJ mol^$$-$$1

$$-$$68.0 kJ mol^$$-$$1

$$-$$86.0 kJ mol^$$-$$1

+97.0 kJ mol^$$-$$1

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

-1

The incorrect expression among the following is :

$${{\Delta {G_{System}}} \over {\Delta {S_{Total}}}} = - T$$ (at constant P)

$$K = {{\Delta H^\circ - T\Delta S^\circ } \over {RT}}$$

$$K = {e^{ - \Delta G^\circ /RT}}$$

For isothermal process $${w_{reversible}} = - nRT\ln {{{V_f}} \over {{V_i}}}$$

JEE Main 2021 (Online) 17th March Evening Shift

MCQ (Single Correct Answer)

-1

During which of the following processes, does entropy decrease?

(A) Freezing of water to ice at 0$$^\circ$$C

(B) Freezing of water to ice at $$-$$10$$^\circ$$C

(C) N₂(g) + 3H₂(g) $$ \to $$ 2NH₃(g)

(D) Adsorption of CO(g) on lead surface.

(E) Dissolution of NaCl in water

Choose the correct answer from the options given below :

(A), (C) and (E) only

(B) and (C) only

(A), (B), (C) and (D) only

(A) and (E) only

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