List of top Chemistry Questions

Which of the following element has the highest ionisation enthalpy?

General formula of solid in zinc blende structure is:

$aK _{2} Cr _{2} O _{7}+ bKCl + cH _{2} SO _{4} \longrightarrow xCrO _{2} Cl _{2}+ yKHSO _{4}+ zH _{2} O$ The above equation balances when

Which of the following has zero net dipole moment?

In the purification of impure nickel by Mond's process, metal is purified by:

The electronic configuration of $Eu$ (Atomic $No. 63$), $Gd$ (Atomic $No. 64$) and $Tb$ (Atomic $No. 65$) are :

The angular speed of the electron in the $n^{th}$ orbit of Bohr hydrogen atom is

In Dumas method one gram of carbon compound gives $50 \,mL$ of $N _{2}$ at $300\, K$ and $740 \,mm\, Hg$ pressure. If the aqueous tension at $300\, K$ is $15\, mm\, Hg$, what is the percentage of nitrogen in it?

Write the IUPAC name of the following

In water saturated air, the mole fraction of water vapour is $0.02$. If the total pressure of the saturated air is $1.2\, atm$, the partial pressure of dry air is :

The molecule/ion having diamagnetic nature and a bond order of $1.0$ is

\(BrO^{3-}\) Changes into \(Br_2\) in an acidic medium of a unbalanced equation how many electron should be present on the balanced electron.

1 g of non-volatile non-electrolyte solute is dissolved in 100g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, $\frac{\Delta T_b(A)}{\Delta T_b (B)}$, is:

Which of the following compounds is not aromatic ?

In the following skew conformation of ethane, $H'-C-C-H''$ dihedral angle is :

An aromatic compound $'A'$ having molecular formula ${C7H6O2}$ on treating with aqueous ammonia and heating forms compound $'B'$. The compound $'B'$ on reaction with molecular bromine and potassium hydroxide provides compound $'C'$ having molecular formula ${C_6H_7N}$. The structure of $'A'$ is :

Arrange the following amines in the decreasing order of basicity:

Ethylamine ${(C2H5NH2)}$ can be obtained from N-ethylphthalimide on treatment with :

Hinsberg's reagent is :

Each unit of DNA has

Which of the following statements about addition polymers is correct?

Which product is formed, when acetonitrile is hydrolysed partially with cold concentrated HCl

Which among the following cannot react with nitrous acid?

Carbocation intermediate is involved in reactions,

In the Williamsons synthesis for preparation of the compounds used are