JEE Main 2020 (Online) 6th September Evening Slot | Thermodynamics Question 95 | Chemistry

For a reaction,
4M(s) + nO₂(g) $$ \to $$ 2M₂O_n(s)
the free energy change is plotted as a function of temperature. The temperature below which the oxide is stable could be inferred from the plot as the point at which :

the free energy change shows a change from negative to positive value

the slope changes from positive to negative

the slope changes from negative to positive

the slope changes from positive to zero

JEE Main 2020 (Online) 5th September Evening Slot

MCQ (Single Correct Answer)

-1

Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol^–1, and 4 kJ mol^–1, respectively.
The hydration enthalpy of NaCl is :

–780 kJ mol^–1

–784 kJ mol^–1

780 kJ mol^–1

784 kJ mol^–1

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-1

The process that is NOT endothermic in nature is :

Ar(g) + e^- $$ \to $$ Ar^-(g)

H(g) + e^- $$ \to $$ H^-(g)

Na(g) $$ \to $$ Na⁺(g) + e^-

O^-(g) + e^- $$ \to $$ O^2-(g)

JEE Main 2020 (Online) 4th September Evening Slot

MCQ (Single Correct Answer)

-1

Five moles of an ideal gas at 1 bar and 298 K is expanded into vacuum to double the volume. The work done is :

Zero

-RT $$\ln {{{V_2}} \over {{V_1}}}$$

C_V (T₂ – T₁)

– RT (V₂ – V₁)

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