List of top Chemistry Questions

The magnetite ore is

If avogadro number $N_A$, is changed from ${6.022 \times 10^{23} \, mol^{-1} }$ to ${6.022 \times 10^{20} \, mol^{-1} }$ , this would change :

Aqueous solution of which of the following compounds is the best conductor of electric current?

A mixture of gases contains $H_2$ and $O_2$ gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture?

In an $S_N1$ reaction on chiral centres, there is :

Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic radii? (Numbers in the parenthesis are atomic numbers)

Consider the following compounds:

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group ?

What is the mole fraction of the solute in a $1.00\, m$ aqueous solution ?

A device that converts energy of combustion of fuels like hydrogen and methane, directly into electrical energy is known as

Buna-$N$ synthetic rubber is obtained by copolymerisation of

The following tripeptide can be synthesized from the following ammo acid

If the density of methanol is $0.8\, kg\, L ^{-1}$, what is its volume needed for making $4\, L$ of its $0.25\, M$ solution?

A unit cell with edge length $ a\ne b\ne c $ and axial angles $ \alpha =\beta =\gamma =90^{\circ} $ is called

Cold ferrous sulphate solution on absorption of $NO$ develops brown colour due to the formation of

A gas can be liquefied at temperature $T$ and pressure $P$ provided

In a mixture, two enantiomers are found to be present in $85\%$ and $15\%$ respectively. The enantiomeric excess $(e, e)$ is

Consider the following salts: $NaCl,\, HgCl_2,\, Hg_2Cl_2,\, CuCl_2,\, CuCl$ and $AgCl$. Identify the correct set of insoluble salts in water

Which one of the following monomers form biodegradable polymer?

$0.06\%\, (w/v)$ aqueous solution of urea is isotonic with

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at $25^{\circ } C$?

The sum of coordination number and oxidation number of the metal M in the complex \([M(en)_2(C_2O_4)]Cl\) (where en is ethylenediamine) is :-

The hybridization involved in complex $ {[Ni(CN)4]^{2-}}$ is (At.No. Ni = 28)

Nitrogen dioxide and sulphur have some properties in common. Which property is shown by one of these compounds, but not by the other?

The rate constant of the reaction $ A \to B$ is $0.6 \times 10^{-3}$ mole per second. If the concentration of A is 5 M, then concentration of $B$ after 20 minutes is :