A gas "X" is used to purify air in cinema halls. It is also used as germicide for sterilizing water and it converts black PbS into a white coloured compound. X's allotrope "Y" react with dry potassium metal forming a yellow solid "Z". Identify X, Y, Z.

A metal X is found in the form of ribbon in the chemistry lab. It burns in the presence of oxygen with a bright dazzling light to form a white solid Z. Identify X and Z

A metal carbonate W on reacting with an acid gives a gas X which when passed through a solution Y gives the carbonate back. Solution Y reacts with gas Z to form a compound P which is used for bleaching wood pulp in paper industry. Identify W, X, Y, Z and P.

Hydrochloric acid reacts with a metal X to form a gas Y, which burns with a 'pop' sound. Sodium hydroxide solution also reacts with same metal X to form same gas Y. Name X and Y.

Identify the compounds X, Y and Z in the following reactions:

A metal carbonate X on reacting with an acid gives a gas which when passed through a solution Y gives the carbonate back. On the other hand, a gas G that is obtained at anode during electrolysis of brine is passed on dry Y, it gives a compound Z, used for disinfecting drinking water . Identify X,Y,G and Z.