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General — JEE Chemistry MCQs

Master General for JEE Main with free chemistry MCQs. Each question includes a detailed solution and instant feedback — practice at easy, medium, and hard difficulty levels to build exam-ready confidence.

7 practice questions with instant feedback and solutions.

Easy•General

The geometries of the ammonia complexes of

\mathrm{Ni}^{2+}, \mathrm{Pt}^{2+}

and

\mathrm{Zn}^{2+}

, respectively, are

Easy•General

Which of the following combination will produce

\mathrm{H}_{2}

gas?

Easy•General

The green colour produced in the borax bead test of a chromium(III) salt is due to

Easy•General

Calamine, malachite, magnetite and cryolite, respectively, are

Medium•General

Among

[\mathrm{Ni(CO)}_{4}]

[\mathrm{NiCl}_{4}]^{2-}

[\mathrm{Co(NH_3)_{4}Cl_2}]\mathrm{Cl}

\mathrm{Na_3}[\mathrm{CoF_6}]

\mathrm{Na_2O_2}

and

\mathrm{CsO_2}

number of paramagnetic compounds is

Medium•General

On decreasing the

p \mathrm{H}

from 7 to 2, the solubility of a sparingly soluble salt (MX) of a weak acid (HX) increased from

10^{-4} \mathrm{~mol} \mathrm{~L}^{-1}

10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}

. The

p\mathrm{~K}_{\mathrm{a}}

\mathrm{HX}

Medium•General

For the following electrochemical cell at

298 \mathrm{~K}

\mathrm{Pt}(s) \mid \mathrm{H}_{2}(g, 1

bar

)\left|\mathrm{H}^{+}(aq, 1 \mathrm{M}) \| \mathrm{M}^{4+}(aq), \mathrm{M}^{2+}(aq)\right| \operatorname{Pt}(s)

E_{\text {cell }}=0.092 \mathrm{~V}

when

\frac{\left[\mathrm{M}^{2+}(aq)\right]}{\left[M^{4+}(aq)\right]}=10^{x}

. Given :

E_{\mathrm{M}^{4} / \mathrm{M}^{2+}}^{0}=0.151 \mathrm{~V} ; 2.303 \frac{R T}{F}=0.059 \mathrm{~V}

The value of

x