List of top Chemistry Questions

Aqueous solutions of $HNO_3 \, KOH, \, CH_3COOH$ and $CH_3COONa $ of identical concentrations are provided. The pair(s) of solutions which form a buffer upon mixing is(are)

At $25^{\circ}C$, the solubility product of $Mg\left(OH\right)_{2} $ is $1.0 \times 10^{-11}$. At which pH, will $Mg^{2+}$ ions start precipitating in the form of $Mg\left(OH\right)_{2}$ from a solution of $0.001 \,M \,Mg^{2+}$ ions ?

For the reaction $A B(g) \rightleftharpoons A(g)+B(g), A B$ is $33 \%$ dissociated at a total pressure of $p$. Therefore, $p$ is related to $K_{p}$ by one of the following options

If the solubility product of lead iodide $(PbI_2)$ is $3.2 \times 10^{-8}$, its solubility will be

In aqueous solution the ionization constants for carbonic acid are $K_1 = 4.2 \times 10^{-7}$ and $K_2 = 4.8 \times 10^{-11}$ Select the correct statement for a saturated 0.034 M solution of the carbonic acid.

What is the $pH$ of $0.01\, M$ glycine solution? For glycine $K_{a_1} = 4.5 \times 10^{-3}$ and $K_{a_2} = 1.7 \times 10^{-10}$ at $298 \,K$.

When pressure is applied to the equilibrium systems : Ice $\leftrightharpoons $ water (liquid), which of the following will take place?

Calculate $K_{C}$ for the reversible process given below if $K_{P}=167$ and $T=800^{\circ} C$ $CaCO _{3}( s ) \rightleftharpoons CaO ( s )+ CO _{2}( g )$

$0.1\, (M)\, HCl$ and $0.1\, (M)\, H_2SO_4$ each of volume $2ml$ are mixed and the volume is made up to $6\, ml$ by adding $2\,ml$ of $0.01\, (N)\, NaCl$ solution. The $pH$ of the resulting mixture is

The relation between $K_p$ and $K_c$ for the following reaction is $\hspace10mm N_2 (g)+3H_2(g) \longrightarrow 2NH_3(g)$

The pH of 10$^{-3}$ M solution of NaOH is

A solution contains 10 mL 0.1 N NaOH and 10 mL $0.05 NH_2SO_4 $,PH of this solution is

Which of the following mixtures can be used to prepare a buffer solution ?

For the reaction, $N_{2}(g)+3 H_{2}(g) \rightleftharpoons 2 N H_{3}(g)$ at $400\, K,\, K_{p}=41 .$ Find the value for the following reaction, $\frac{1}{2} N _{2}(g)+\frac{3}{2} H _{2}(g) \rightleftharpoons NH _{3}(g)$

The maximum number of $P-H$ bonds are contained in which of the following molecules?

Which of the following processes occurs in the electrolysis of an aqueous solution of nickel chloride at nickel anode?

The shape and hybridisation of some xenon oxyfluorides are given. Choose the wrong set.

Total number or voids in $0.5$ mole or compound forming hexagonal closed packed structure are

Crystals can be classified into basic crystal habits equal to

At identical temperature and pressure, the rate of diffusion of hydrogen gas is $3\sqrt{3}$ times that of a hydrocarbon having molecular formula $C_{n}H_{2n-2}$. What is the value of $'n'$ ?

Structural formula of Lewisite is

Water gas is a mixture of

The white $ ZnO $ turns yellow on heating because of

The standard enthalpy of formation of $NH_3$ is $-46.0\, kJ \,mol^{-1}$. If the enthalpy of formation of $H_2$ from its atoms is $-436\, kJ \,mol^{-1}$ and that of $N_2$ is $-712\, kJ\, mol^{-1}$, the average bond enthalpy of $N-H$ bond in $NH_3$ is

The standard emf of a galvanic cell involving $3$ moles of electrons in its redox reaction is $0.59 \,V$. The equilibrium constant for the reaction of the cell is