List of top Chemistry Questions

Phenol and benzoic acid are distinguished by:

Alkyl halides react with dialkyl copper reagents to give

Which of the following gives propyne on hydrolysis?

Aluminium oxide may be electrolysed at 1000 $^{\circ}$C to furnish aluminium metal (Atomic mass = 27 amu: 1 faraday = 96,500 Coulombs). The cathode reaction is $Al^{3+} + 3e^- \to Al^{\circ}$ To prepare 5.12 kg of aluminium metal by this method would require :

The salt soluble in excess of sodium hydroxide solution is

Concentrated nitric acid with aluminium gives

If a is the degree of dissociation of $Na_2SO_4$, the van?t Hoff factor (i) used for calculating the molecular mass is :

The volume of a colloidal particle, $V_C$ as compared to the volume of a solute particle in a true solution $V_S$, could be :

Noble gases are adsorbed by:

Synthetic polymer which resembles natural rubber is:

$Na _{2} S _{2} O _{3}+ I _{2} \longrightarrow$ Product is

$50 \,mL$ of $10 \,N H_2SO_4, 25 \,mL$ of $12 \,N \,HCI$ and $40\, mL$ of $5N \,HNO_3$ are mixed and the volume of the mixture is made $1000\, mL$ by adding water. The normality of resulting solution will be

How will you separate a solution (miscible) of benzene $ +CHCl_{3}$ ?

Formalin is:

Which one of the following statements) is incorrect about order of reaction?

According to law of mass action rate of a chemical reaction is proportional to :

A reaction involving two different reactants can never be

Consider an endothermic reaction $X\, \to \,Y$ with the activation energies $E_b$ and $E_f$ for the backward and forward reactions respectively. In general :

The rate constant of a reaction depends on:

The temperature coefficient of a reaction is 2. If the velocity of the reaction is 5 at 25�C, then, the velocity of the reaction at 55�C is

If $2.0 \,g$ of a radioactive isotope has a half-life of $20\, h$, the half-life of $0.25 \,g$ of the same substance is:

Law of multiple proportions is illustrated by one of the following pairs:

The amount of calcium carbonate that reacts with 500 cc of 0.5 N hydrochloric acid is

On reduction with hydrogen, $3.6\, g$ of an oxide of metal left $3.2\, g$ of metal. If the vapour density of metal is $32$, the simplest formula of the oxide would be

In electrolysis of dilute $ H_2SO_4$, what is liberated at anode?