When 22.4 liters of H_2(g) is mixed with 11.2 litres of Cl_2(g), each at S.T.P. the moles of HCl_(g) formed is equal to

Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27^oC in identical conditions. The ratio of the volumes of gases H₂ : O₂ : methane would be

In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO₃, which of the following will be the formula of the chloriode (X stands for the symbol of the element other than chlorine)

6.02 $$ \times $$ 10²⁰ molecules of urea present in 100 mL of its solution. The concentration of solution is