List of top Chemistry Questions

$ Pb + Conc. HNO_3$ gives

At $18^{\circ}$C, the conductance of $H^+$ and $CH_3COO^-$ at infinite dilution are $315$ and $35\, mho\, cm^ 2\, eq^{-1}$ respectively. The equivalent conductivity of $CH_3COOH$ at infinite dilution is _____ $mho\,cm^ 2\,eq^{-1}$

$S _{ N } 1$ reaction is basically a solvolysis reaction. Polar protic solvents help the substrate to ionise and by the way get involved in $S _{ N } 1$ reaction.

: Noble gases have positive electron affinity. : Noble gases have stable closed shell electronic configuration.

Helium has the highest value of ionisation energy among all the elements known. Helium has the highest value of electron affinity among all the elements known.

Conductivity of silicon increases by doping it with group-15 elements. Doping means introduction of small amount of impurities like $P, As$ or $Bi$ into the pure crystal.

: Chlorine when solidifies does not have zero entropy even at absolute zero. : Chlorine is a pungent smelling gas and it is difficult to solidify it.

: Calcium carbide on hydrolysis gives ethylene. : Calcium carbide contains $C^{4-}$ anions.

Bond energy and bond dissociation energy have identical value for diatomic molecules. Greater the bond dissociation energy, less reactive is the bond.

Benzene on heating with conc. $H_2SO_4$ gives benzenesulphonic acid which when heated with superheated steam under pressure gives benzene. Sulphonation is a reversible process.

A primary amine has higher boiling point than any tertiary amine. A tertiary amine has greater number of $N - H$ bonds for $H$-bonding.

The colloidal system in which the disperse phase and dispersion medium are both liquids is known as

During smelting an additional substance is added which combines with impurities to form a fusible product which is known as

Isotonic solutions are the solutions having the same

Nylon-6 is made from

Which of the following is used to make non-stick cookware?

The units of conductivity are

An example of water soluble vitamin is

What is the freezing point of a solution containing $ \text{8}\text{.1 g HBr} $ in 100 g water assuming the acid to be 90% ionised? ( $ {{k}_{f}} $ for water $ =1.86\,\text{K}\,\text{mo}{{\text{l}}^{-1}} $ )

Which of the following is optically active?

Which of the following is paramagnetic with bond order $0.5$?

Which of the following statements is true for the electrochemical Daniell cell?

Which of the following thermodynamic relation is correct ?

Which one of the following compounds has the most acidic nature?

Which one of the following compounds is a peroxide?