JEE Mains · Chemistry · STD 11 - 6.1. Equilibrium - 1 (chemical Equilibrium)

Consider the general reaction given below at 400 K
\(xA ( g ) \rightleftharpoons yB ( g )\)
The values of \(K _{ p }\) and \(K _{ c }\) are studied under the same condition of temperature but variation in x and y .
(i) \(K _{ p }=85.87\) and \(K _{ c }=2.586\) appropriate units
(ii) \(K _{ p }=0.862\) and \(K _{ c }=28.62\) appropriate units
The value of \(x\) and \(y\) in (i) and (ii) respectively are:

A (i) 3, 1; (ii) 3, 1
B (i) 4, 1; (ii) 4, 1
C (i) 1, 3; (ii) 2, 1
D (i) 1, 2; (ii) 2, 1

Verified Solution

Answer & Solution

Correct Answer

(D) (i) 1, 2; (ii) 2, 1

Step-by-step Solution

Detailed explanation

For reaction (i): \(K _{ p }> K _{ c }\) \(\Delta n _{ g }>0\) \(y-x>0\) \(85.87=2.586(0.0821 \times 400)^{y \times}\) Solving \(y-x \simeq 1\) For reaction (ii) : \(K _{ p }< K _{ c }\) \( y-x<0\).

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List-I with List-II

List-I Pair of Compounds	List-II Type of Isomers
A. 2-Methylpropene and but-1-ene	I. Stereoisomers
B. Cis-but-2-ene and trans-but-2-ene	II. Position isomers
C. 2-Butanol and diethyl ether	III. Chain isomers
D. But-1-ene and but-2-ene	IV. Functional group isomers

Choose the correct answer from the options given below:

JEE Mains 2026 Easy

Match \(List-I\) with \(List-II\).

\(List-I\)	\(List-II\)
\((A)\) \(Cd ( s )+2 Ni ( OH )_{3}( s ) \rightarrow CdO ( s )+2 Ni ( OH )_{2}( s )+ H _{2} O (l)\)	\((I)\) Primary battery
\((B)\) \(Zn ( Hg )+ HgO ( s ) \rightarrow ZnO ( s )+ Hg (l)\)	\((II)\) Discharging of secondary battery
\((C)\) \(2 PbSO _{4}( s )+2 H _{2} O (l) \rightarrow Pb ( s )+ PbO _{2}( s )+ 2 H _{2} SO _{4}( aq )\)	\((III)\) Fuel cell
\((D)\) \(2 H _{2}( g )+ O _{2}( g ) \quad \rightarrow 2 H _{2} O (l)\)	\((IV)\) Charging of secondary battery

Choose the correct answer from the options given below.

JEE Mains 2022 Medium

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