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Chemistry · 2026

JEE Main · 23 January 2026, Shift 1 · Q56

Consider the general reaction given below at 400 K x A ( g ) ⇌ y B ( g ). The values of K_p and K_c are studied under the same condition of…

Consider the general reaction given below at $\displaystyle 400$ K
$$x \mathrm{~A}(\mathrm{~g}) \rightleftharpoons y \mathrm{~B}(\mathrm{~g}) .
$$The values of $\displaystyle \mathrm{K}_{\mathrm{p}}$ and $\displaystyle \mathrm{K}_{\mathrm{c}}$ are studied under the same condition of temperature but variation in $\displaystyle x$ and $\displaystyle y$.
(i)
$\displaystyle \mathrm{K}_{\mathrm{p}}=85.87$ and $\displaystyle \mathrm{K}_{\mathrm{c}}=2.586$ appropriate units
(ii)
$\displaystyle \mathrm{K}_{\mathrm{p}}=0.862$ and $\displaystyle \mathrm{K}_{\mathrm{c}}=28.62$ appropriate units
The values of $\displaystyle x$ and $\displaystyle y$ in (i) and (ii) respectively are:
(i)
(ii)
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JEE Main 2026 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.