List of top Chemistry Questions

The process of zone refining is used in the purification of

The values of $K_{sp}$ of $CaCO_3$ and $CaC_2O_4$ are $4.7 \times 10^{-9}$ and $1.3 \times 10^{-9}$ respectively at $25�C$. If the mixture of these two is washed with water, what is the concentration of $Ca^{2+}$ ions in water?

An example for a neutral buffer is

Which of the following cations will have minimum flocculation value for arsenic sulphide sol ?

The stability of a Lyophobic colloid is due to

Mesomeric effect involves

$XeF_2$ is isostructural with:

Which one of the following molecules contains no $\pi$ bond ?

Which of the following is a polar molecule ?

What is the density of $N_2$ gas at $227°C$ and 5.00 atm. pressure ? (R = 0.082 L Atm $K^{-1} mol^{-1}$)

Hybridised states of carbon in Graphite and Diamond are respectively

A group of atoms can function as a ligand only when

An alkyl bromide $(X)$ reacts with Sodium in ether to form $4, 5$ -diethyl octane, the compound X is

Acetone and Propanal are

Which of the following is not a colligative property ?

The number of water molecules present in a drop of water weighing $0.018\, gm$ is

Which one of the following is not correct ?

Which of the following aqueous solutions will exhibit highest boiling point ?

When limestone is heated, $CO_2$ is given off. The metallurgical operation is

Alkali metals have negative reduction potential and hence they behave as

The number of optical isomers of the compound $CH_3-CHBr-CHBr- COOH$ is

Correct statement(s) in cases of n-butanol and t-butanol is (are)

Pick out the electrophiles from following species $ BF_{3} $ , $ NH_{3} $ , $ Me_3C^+ $ , $ HCl $

Vapour pressure of pure benzene is $119$ torr and that of toluene is $37.0$ torr at the same temperature. Mole fraction of toluene in vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene $0.50$, will be :

For an isolated system, q is zero. In an isolated system, change in U and V is zero.