JEE Main 2022 — Chemistry Physical Chemistry

2022mcqmedium

Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$

Assertion $A$ : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.

Reason $R$ : The value of ${\Delta G}^{\Theta }$ becomes more on negative side as entropy is higher in liquid state than solid state.

In the light of the above statements. Choose the most appropriate answer from the options given below

Official previous-year question

Held on 28 Jul 2022 · Verified 6 Jul 2026.

Options

A
Both $A$ and $R$ are correct and $R$ is the correct explanation of $A$
B
Both $A$ and $R$ are correct but $R$ is NOT the correct explanation of $A$
C
$A$ is correct but $R$ is not correct
D
$A$ is not correct but $R$ is correct

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Solution

The entropy is higher if the metal is in liquid state than when it is in solid state. The value of entropy change $(\Delta S)$ of the reduction process is more on positive side when the metal formed is in liquid state and the metal oxide being reduced is in solid state. Thus the value of ${\Delta }_{f}G$ becomes more on negative side and the reduction becomes easier.

$\Delta G=\Delta H-T\Delta S$

$\because$ Entropy of liquid is more than solid

$\therefore$ on melting the entropy increases and $\Delta G$ becomes more negative and hence it becomes easier to reduce metal.

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Solution

$\Delta G=\Delta H-T\Delta S$

$\because$ Entropy of liquid is more than solid

$\therefore$ on melting the entropy increases and $\Delta G$ becomes more negative and hence it becomes easier to reduce metal.

JEE Main 2022 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

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JEE Main 2022 — Chemistry Physical Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Physical Chemistry in other years

More JEE Main Physical Chemistry questions

Other Chemistry topics for JEE Main

Organic Chemistry

Inorganic Chemistry

Keep practicing Physical Chemistry