JEE Main Previous Year Papers Questions of Chemistry with Solutions are available at eSaral. Practicing JEE Mains chapter wise questions of Chemistry will help the JEE aspirants in realizing the question pattern as well as help in analyzing weak & strong areas.

*Simulator*

**Previous Years AIEEE/JEE Mains Questions**

(1) 46.06 minutes (2) 460.6 minutes (3) 230.3 minutes (4) 23.03 minutes

**[aieee-2009]**

**Sol.**(1)

(1) 1 h

(2) 4 h

(3) 0.5 h

(4) 0.2**9.**

**[aieee-2010]**

**Sol.**(4)

For zero order reaction

$\mathrm{Cl}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{S}(\mathrm{aq}) \rightarrow \mathrm{S}(\mathrm{s})+2 \mathrm{H}^{+}(\mathrm{aq})+2 \mathrm{Cl}^{-}(\mathrm{aq})$

The rate equation for this reaction is rate = $\mathrm{k}\left[\mathrm{Cl}_{2}\right]\left[\mathrm{H}_{2} \mathrm{S}\right]$

Which of these mechanisms is/are consistent with this rate equation?

**[aieee-2010]**

**Sol.**(1)

(1) $\mathrm{k}_{1}=2 \mathrm{k}_{2} \mathrm{e}^{\mathrm{E}_{2} / \mathrm{RT}}$

(2) $\mathrm{k}_{1}=\mathrm{k}_{2} \mathrm{e}^{\mathrm{Ea}_{1} / \mathrm{RT}}$

(3) $\mathrm{k}_{2}=\mathrm{k}_{1} \mathrm{e}^{\mathrm{Ea}_{2} / \mathrm{RT}}$

(4) $\mathrm{k}_{1}=\mathrm{A} \mathrm{k}_{2} \mathrm{e}^{\mathrm{Ea}_{1} / \mathrm{RT}}$

**[aieee-2011]**

**Sol.**(2)

(1) 32 times (2) 64 times (3) 10 times (4) 24 times

**[aieee-2011]**

**Sol.**(1)

$\mathrm{k}_{2}=\mathrm{k}_{1}(2)^{5}=32 \mathrm{k}_{1}$

(1) $1.73 \times 10^{-4} \mathrm{M} / \mathrm{min}$

(2) $1.73 \times 10^{-5} \mathrm{M} / \mathrm{min}$

(3) $3.47 \times 10^{-4} \mathrm{M} / \mathrm{min}$

(4) $3.47 \times 10^{-5} \mathrm{M} / \mathrm{m}$

[**aieee-2012]**

**Sol.**(3)

$\left(\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{mol}^{-1} \text { and } \log 2=0.301\right)$

(1) $53.6 \mathrm{kJ} \mathrm{mol}^{-1}$

(2) $48.6 \mathrm{kJ} \mathrm{mol}^{-1}$

(3) $58.5 \mathrm{kJ} \mathrm{mol}^{-1}$

(4) $60.5 \mathrm{kJ} \mathrm{mol}^{-1}$

**[J-main 2013]**

**Sol.**(1)

(1) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}][\mathrm{B}]^{2}$

(2) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}]$

(3) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}][\mathrm{B}]$

(4) $\frac{\mathrm{dc}}{\mathrm{dt}}=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{B}]$

**[J-main 2014]**

**Sol.**(2)

(1) shifting of equilibrium towards reactants due to elastic collision

(2) loss of active species on collision

(3) low probability of simultaneous collision of all the reacting species

(4) increase in entropy and activation energy as more molecules are involved.

**[JEE-MAIN-(Offline) 2015]**

**Sol.**(3)

Higher order (>3) reaction are rare due to low probability of simulatneous collision of more than three molecuels.

$2 \mathrm{N}_{2} \mathrm{O}_{5}(\mathrm{g}) \rightarrow 4 \mathrm{NO}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})$

follows first order kinetics. The pressure of a vessel containing only $\mathrm{N}_{2} \mathrm{O}_{5}$ was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. will be (Assume temperature remains constant)

(1) 106.25 nm Hg

(2) 116.25 nm Hg

(3) 125 mm Hg

(4) 150 mm Hg

**[JEE-MAIN (Online)2015]**

**Sol.**(2)

(1) $\mathrm{E}_{\mathrm{f}}=60 \mathrm{kJ} / \mathrm{mol} ; \mathrm{E}_{\mathrm{b}}=100 \mathrm{kJ} / \mathrm{mol}$

$|(2) \mathrm{E}_{\mathrm{f}}=30 \mathrm{kJ} / \mathrm{mol} ; \mathrm{E}_{\mathrm{b}}=70 \mathrm{kJ} / \mathrm{mol}$

(3) $\mathrm{E}_{\mathrm{f}}=80 \mathrm{kJ} / \mathrm{mol} ; \mathrm{E}_{\mathrm{b}}=120 \mathrm{kJ} / \mathrm{mol}$

(4) $\mathrm{E}_{\mathrm{f}}=70 \mathrm{kJ} / \mathrm{mol} ; \mathrm{E}_{\mathrm{b}}=30 \mathrm{kJ} / \mathrm{mol}$

**[JEE-MAIN (Online)2015]**

**Sol.**(3)

**[JEE – Main 2016]**

**Sol.**(3)

$\mathrm{H}_{2} \mathrm{O}_{2(\mathrm{aq})} \longrightarrow \mathrm{H}_{2} \mathrm{O}_{(\mathrm{aq})}+\frac{1}{2} \mathrm{O}_{2}(\mathrm{g})$

(1) 8 (2) 12 (3) 6 (4) 4

**[JEE – Main 2017]**

**Sol.**(4)

From arrhenius equation,

(1)3

(2) 1

(3) 0

(4) 2

**[JEE – Main 2018]**

**Sol.**(4)

helphul

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