1
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below is an expression for the rate constant of a first-order reaction occurring at a certain temperature, $\mathrm{T}(\mathrm{K})$.

$$ \operatorname{lnk}=14.34-\frac{1.25 \times 10^4}{T} $$

The energy of activation in $\mathrm{kcal} \mathrm{mol}^{-1}$ for the reaction is :

(Given: $\mathrm{k}^{-1} \mathrm{~s} \mathrm{~s}^{-1}, \mathrm{R}=1.987 \mathrm{cal} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ )

A

24.84

B

14.34

C

18.63

D

12.42

2
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language
Given below are certain reactions. Identify the reaction for which $K_P \neq K_C$.
A

$\mathrm{H}_2 \mathrm{O}(\mathrm{g})+\mathrm{CO}(\mathrm{g}) \rightleftharpoons \mathrm{H}_2(\mathrm{~g})+\mathrm{CO}_2(\mathrm{~g})$

B

$\mathrm{N}_2(\mathrm{~g})+3 \mathrm{H}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_3(\mathrm{~g})$

C

$\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$

D

$\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})$

3
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

Identify the incorrect statement from the following :

A

The largest and the smallest species among $\mathrm{Mg}, \mathrm{Mg}^{2+}, \mathrm{Al}$ and $\mathrm{Al}^{3+}$ are Al and $\mathrm{Mg}^{2+}$ respectively.

B

The IUPAC name of the element with atomic number 107 is Unnilseptium.

C

The similarity in behaviour of Li with Mg is referred to as 'diagonal relationship'

D

The oxidation state and covalency of Al in $\left[\mathrm{AlCl}\left(\mathrm{H}_2 \mathrm{O}\right)_5\right]^{2+}$ are 3 and 6, respectively.

4
NEET 2026
MCQ (Single Correct Answer)
+4
-1
Change Language

Mixture of chloroform and acetone forms a solution with negative deviation from Raoult's law due to :

A

Increase in escaping tendency of molecules of each component.

B

Formation of hydrogen bonding between acetone and chloroform

C

Stronger intermolecular forces between chloroform molecules than those between chloroform and acetone molecules.

D

Repulsive forces.