Chemistry Question Bank

At room temperature and pressure two flask of equal volumes are filled with \(\mathrm{H_2}\) and \(\mathrm{SO_2}\) respectively. Particles which are equal in number in two flasks are

Simplest formulae of a compound containing 20% of element X (atomic weight 10) and 80% of element Y (atomic weight 20) is

Which of the following samples contains 2.0 1023 atoms?

A copper sulphate solution contains 1.595% of \(\mathrm{CuSO_4}\) by weight. Its density is 1.2 g / ml, Its molarity will be

6.023 ×1023 molecules of Ca (OH)₂ react with 3.01×1022 molecules of HCl, number of moles of \(\mathrm{CaCl_2}\) obtained are

The \(\mathrm{O_18O_16}\) ratio in some meteorites is greater than that used to calculate the average atomic mass of oxygen on earth. The average mass of an atom of oxygen in these meteorites is ………. that of a terrest…

An element, X, have three isotopes X 20, X 21 and X 22. The percentage abundance of X 20is 90% and its average atomic mass of the element is 20.11. The percentage abundance of X 21 should be

An organic compound on analysis was found to contain 0.014% of nitrogen. If its molecule contains two N atoms, then the molecular mass of the compound

A compound contains 28% nitrogen and 72% metal by mass 3 atoms of the metal combine with 2 atoms of nitrogen. The atomic mass of metal is

A partially dried clay mineral contains 8% water. The original sample contained 12% water and 45% silica. % of Silica in the partially dried sample is nearly

Cortisone is a molecular substance containing 21 atoms of carbon per molecule. The weight percentage of carbon in cortisone is 69.98%. What is the molecular weight of cortisone?

The charge on 1 gram ion of \(\mathrm{Al_3}\) is (e represents magnitude of charge on 1 electron)

Which one of the following statements is not correct?

Which of the following weighs the least

The no. of moles of carbon dioxide which contain 8g of oxygen is

The wt. of NO having the same no. of oxygen atom present in 9.2 gm of is

Which of the following samples contains the smallest no. of atoms?

Which of the following substances contains the greatest mass of chlorine

Which of the following has greatest no. of oxygen atoms

The element A at wt.=75 and B at wt. =32 combine to form a compound X. If 3 mol of B combine with 2 mol of A to give 1 mol of X, the weight of 5 mol of X is

A sample contains 200 atoms of hydrogen, 0.05 gm atom of nitrogen, 1020 gm atom of oxygen. What is the approximate no. of total atoms

Maximum no. of hydrogen atoms are in:

8 g of sulphur is burnt to form \(\mathrm{SO_2}\) which is oxidised by \(\mathrm{Cl_2}\) water. The solution is treated with \(\mathrm{BaCl_2}\) solution. The amount of \(\mathrm{BaSO_4}\) precipitated is

If half mole of oxygen gas combine with Al to form , the weight of Al used in the reaction is:

25.0 ml of HCl solution gave, on reaction with excess solution of . The molarity of HCl solution is