List of top Chemistry Questions

$Nylon-6,6$ is an example of a polymer formed by

Which of the following equations give ionic product of water? (i) $ { NH_{3(aq)} + H_2 O <=> NH^+_{4(aq)} + OH^{-}_{(aq)}}$ (ii) $ { NH^+_{4(aq)} + H_2 O <=> H_3O^+ + NH_{3(aq)}}$ (iii) $ { NH^{-}_{2(aq)} + H_2 O <=> NH_{3(aq)} + OH^-}$ (iv) $ { NH_{3(aq)} + OH^{-}_{(aq)} <=> NH^{-}_{2(aq)} + H_2O}$

Sodium rosinate is generally added in the soap because it

Strongest reducing agent among the following is (i) $ {Na^+ + e^- ->Na_{(s)} \:\: E^{\circ} = - 2.71 \, V}$ (ii) $ {Al^{3+} + 3e^- ->Al_{(s)} \:\: E^{\circ} = - 1.66 \, V}$ (iii) $ {F_{2(g)} + 2e^- ->2F^- \:\: E^{\circ} = + 2.87 \, V}$ (iv) ${2H_2 O+ 2e^- ->H_{2(g)} + 2OH^-_{(aq)} \:\: E^{\circ} = - 0.83\, V}$

The cathode reaction in the dry cell will be

The correct increasing order of basic strength of following amines, $ {C2H5NH2, NH3, (C2H5)2NH, C6H5NH2}$ in gaseous state is

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

In benzene, the triple bond consists of