List of top Chemistry Questions

Oxygen will directly react with each of the following elements except?

When orthophosphoric acid is heated to 600$^{\circ}$C, the product formed is

The number of oxygen atoms in $4.4\, g$ of $CO_2$ is,

Which one has the lowest boiling point?

Prussian blue is formed when

Photographic plates and films have an essential ingredient of

Bleaching powder reacts with a few drops of conc. HCI to give

An example of a double salt is

The substance used as a smoke screen in war fare is

$H_2O$ has a net dipole moment while $BeF_2$ has zero dipole moment because

Which of the following does not apply to metallic bond?

Which of the following statements do not form a part of Bohr's model of hydrogen atom?

If p, V, M, T and R are pressure, volume, molar mass, temperature and gas constant respectively, then for an ideal gas, the density is given by

A metal oxide has the formula $M_2O_3$. It can be reduced by $H_2$ to give free metal and water. $0.1596\, g$ of $M_2O_3$ required 6 mg of $H_2$ for complete reduction. The atomic mass of the metal is

Red P can be obtained from white P by

Which one of the following is the strongest base?

Which of the following is the strongest acid?

The ground state electronic configuration of chromium is

Nitrogen (I) oxide is produced by

The value of van derWaals' constant a for the gases $O_2, N_2$, $NH_3$ and $ CH_4$ are 1.360, 1.390,4.170 and $2.253L^2$ atm $mol^{-2}$ respectively. The gas which can most easily be liquefied is

Pauling's electronegativity values for elements are useful in predicting

The C- H bond distance is the longest in

Which of the following 0.1 M aqueous solution will have the lowest freezing point?

Calgon used as a water softner, is