Chemistry Question Bank

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)

A mixture contains n moles of \(\mathrm{H_2}\) and 2n moles of \(\mathrm{CH_4Th}\) ratio of no. of C:H atoms in the mixture is:

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:

A mixture of KBr and NaBr weighing 0.560 gm was treated with aqueous Ag⁺ and all the bromide ion was recovered as 0.970 gm of pure AgBr. The weight of KBr in the sample is

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

Calcium carbonate reacts with aqueous to give according to the reaction, . The mass of required to react completely with of is

of a hydrocarbon requires of for complete combustion. Calculate value of?

How many gms of copper would be displaced from the copper sulphate solution by adding 27 gm of aluminium