List of top Chemistry Questions

If the salts $ M_2X $ , $ QY_2 $ and $ PZ_3 $ have the same solubilities, their $ K_{sp} $ values are related as

$K_{sp}$ of $CaSO_4\cdot5H_2O$ is 9 x $10^{-6}$, find the volume for 1 g of $CaSO_4$ (M.wt. = 136).

What is the $pH$ of a $0.5\, M$ aqueous solution of $NH_4Cl$ with $0.2\, M \,NH_3$? $ (pK_a = 9.25)$

Le-Chatelier?s principle is not applicable to

Given a gas phase reaction, $\hspace10mm 2A(g)+B(g) \rightleftharpoons C(g)+D(g)$ Which one of the following changes will affect the value of $K_c$?

The equilibrium constant for mutarotation $\alpha-D \rightleftharpoons \beta-D$ Glucose is $1.8$. What percentage of $\alpha$ form remains at equilibrium?

Solubility product of ${PbCl_2}$ at ${298\, K}$ is ${1 \times 10^{-6}}$. At this temperature, solubility of ${PbCl_2\, (in\, mol/L)}$ is

A vessel at 1000 K contains $CO_2$ with a pressure of 0.5 atm. Some of the $CO_2$ is converted into CO on the addition of graphite. It the total pressure at equilibrium is 0.8 atm, the value of K is

An acid HA ionises as $HA {\rightleftharpoons} H^{+} + A^{-}$ The pH of 1.0 M solution is 5. Its dissociation constant would be:

Identify the incorrect statement from the following:

$bcc$ and $hcp$ has same packing efficiency. Both have same number of atoms per unit cell and same arrangement.

Neutron was discovered by

Bombardment of aluminium by a-particle leads to its artificial disintegration in two ways, (i) and (ii) as shown. Products X , Y and Z respectively, are

The correct decreasing order of $pK_b$ is

Which one of the following alkylbromides undergoes most rapid solvolysis in methanol solution to give corresponding methyl ether?

For adiabatic process, which is correct?

The reduction potential of hydrogen half-cell will be negative if :

When a number of thermocouple are joined in series, the thermo emf

The freezer in a refrigerator is located at the top section so that

The enthalpy of formation of $CO_{\left(g\right),} CO_{2\left(g\right)}, N_{2}O_{\left(g\right)}$ and $N_{2}O_{4\left(g\right)}$ is -110, -393, +811 and 10 kj/mol respectively. For the reaction, $N_{2}O_{4\left(g\right)}+3CO_{\left(g\right)}\to N_{2}O_{\left(g\right)}+3CO_{2\left(g\right)}.\Delta H_{r} \left(kJ/mol\right)$ is

Rutherford's atomic model could account for

Rochelle's salt is

Phosphine is prepared by the action of

$PCl_3$ on hydrolysis gives fumes of