List of top Chemistry Questions

The molecular weight of benzoic acid in benzene as determined by depression in freezing point method corresponds to

Sodium thiosulphate is prepared by

$KF$ combines with $HF$ to form $KHF_2.$ The compound contains the species

If $\alpha$ is the fraction of HI dissociated at equilibrium in the reaction, ${ 2HI(g) <=> H_2(g)+I_2(g)}$ starting with the 2 moles of HI, then the total number of moles of reactants and products at equilibrium are

Which of the following is the least stable and its existence is doubtful ?

An aqueous solution $FeSO_4 . Al_2(SO_4 )_3$ and chrome alum is heated with excess of $Na_2 0_2$ and filtered. The materials obtained are

Hydrolysis of one mole of peroxodisulphuric acid produces

Which one of the following oxides is neutral ?

A dilute aqueous solution of $ Na_2SO_4 $ is electrolysed using platinum electrodes. The products at the anode and cathode are respectively

Which of the following ion in aqueous medium has orange colour?

Which of the following acids, will be able to give silver mirror test?

What is the oxidation number of chromium in chromyl chloride?

The number of possible optical isomers of lactic acid are:

The molar conductivity of an aqueous solution of strong electrolyte:

Ethyl amine reacts with $ HN{{O}_{2}} $ to give:

Emulsifier is an agent which:

Which one of the following molecules is planar?

Copper sulphate dissolves in ammonical solution to give deep blue colour. The colour is due to the formation of:

The IUPAC name of the compound, $ {{C}_{2}}{{H}_{5}}NHCOC{{H}_{3}} $ is:

On heating one end of a piece of a metal, the other end becomes hot because of

The number of possible isomers of the compound with molecular formula $C_7H_8 O$ is

The normal boiling point of water is 373 K(at 760 mm). Vapour pressure of water at 298 K is 23 mm. If enthalpy of vaporisation is 40.656 kJ the boiling point of water at 23 mm atmospheric pressure will be

The $ BCl_3$ is a planar molecule whereas $NCl_3$ is pyramidal because

The correct order of the $O - O$ bond length in $O_2,H_2 O_2 $ and $O_3 $ is

If enthalpies of formation for $C _{2} H _{4}(g), CO _{2( g )}$ and $H _{2} O _{(1)}$ at $25^{\circ} C$ and $1\, atm$ pressure are $52,-394$ and - $286\, kJ / mol$ respectively, then enthalpy of combustion of $C _{2} H _{4}( g )$ will be