List of top Chemistry Questions

In the modern periodic table, the period indicates the value of:

Elements with atomic number 35 belongs to

Which pair will show common ion effect ?

A binary solution of ethanol and n-heptane is an example of

A compound is formed by substitution of two chlorine for two hydrogens in propane. The number of possible isomeric compounds is 

If nt number of radioatoms are present at time t, the following expression will be a constant : 

The velocity of the most energetic electrons emitted from a metallic surface is doubled when the frequency v of the incident radiation is doubled. The work function of this metal is

Conjugate acid of $SO_4^{2-}$ is

List various types of isomerism possible for coordination compounds, giving an example of each

The tenth element in the periodic table resembles the element with atomic number

Direct nitration of aniline is not a feasible process because

Arrange the following ions in the order of decreasing X-0 bond length, where X is the central atom in $SiO_4^{4-},ClO_4^- ,PO_4^{3-},SO_4^{2-}$

Glucose on oxidation with bromine water gives

Which one of the following has a different crystal lattice from those of the rest?

In the estimation of sulphur by Carius method, $0.480\, g$ of an organic compound gives $0.699 \,g$ of barium sulphate. The percentage of sulphur in this compound is (Atomic masses: $Ba\, = 137, S = 32, 0 = 16)$

The crystal field splitting energy for octahedral $(\Delta_0)$ and tetrahedral $(\Delta_t) $complexes is related as

The reaction of $ CHC{{l}_{3}} $ and alcoholic $ KOH $ with $ p $ -toluidine gives

Consider the following statements concerning $N_2H_4$ 1. It is an exothermic compound 2. It burns in air with the evolution of heat 3. It has kinetic stability 4. In reduces $Fe^{3+}$ to $Fe^{2+}$ in acidic medium Which of the following combination is correct?

Which one of the following amines forms a non-acidic and alkali insoluble product with p-toluenesulphonyl chloride?

Dry air is passed through a solution containing $ 10\,g $ of a solute in $ 90\,g $ of water and then through pure water. The loss in weight of solution is $ 2.5\,g $ and that of pure solvent is $ 0.05 \,g $ . Calculate the molecular weight of the solute.

The correct order of ease of cleavage of ether linkage by hydrogen halide follows

When methane is heated with dioxygen in the presence of $Mo_2O_3$ catalyst, the organic product obtained is

Which of the following pairs contain metalloid elements in the periodic table?

For a first order reaction, the time taken to reduce the initial concentration by a factor of 1/4 is 20 min. The time required to reduce initial concentration by a factor of 1/16 is