148mg of Ca(OH)₂ is required to remove hardness of one lit. of hard water by Clarke’s process. If hardness is due to only calcium bicarbonate, what is the degree of hardness of sample of water?

The addition of HCl will not suppress the ionization of

The weakest acid among the following is

Ultrapure elements are obtained in the following method of metal refining

In dry cell cathode is

Three faradays of electricity are passed through molten Al₂O₃, aqueous solution of CuSO₄ and molten NaCl taken in three different electrolytic cells. The amount of Al,Cu and Na deposited at the cathodes will be in the ratio of

Order of boiling points

CCl₃COCH₃+Ca(OH)₂→X+Y. Here X and Y are

For the reversible reaction C₂H₄+H₂↔C₂H₆ the equilibrium constant can be expressed in units of

In which of the following reactions, the concentration of reactant is equal to concentration of product at equilibrium(K=equilibrium constant)