Name the catalyst.

A gas 'X' combines with another gas 'Y' in the presence of a catalyst 'C' to form a colourless gas 'Z'. The gas Z gives dense white fumes with hydrogen chloride and the gas 'Y' turns red litmus blue. Name the catalyst C.

(i) Write structural formula of the compound formed when one mole of ethyne reacts with one mole of hydrogen gas. (ii)Name the catalyst used in the above reaction. (iii) Write temperature at which the reaction mentioned in (a) occurs. (iv) Name the reaction.

Name few catalysts used in aromatization reaction.

Some bacteria obtain their energy by oxidising sulphur, producing sulphuric acid as a by-product. In the laboratory, or in industry, the first step in the conversion of sulphur to sulphuric acid is to produce sulphur dioxide. The sulphur dioxide is converted to sulphur trioxide, which reacts with water to give sulphuric acid. Name one catalyst used industrially which speeds up the conversion of sulphur dioxide to sulphur trioxide.

Hydrogeneration of oils (manufacture of vegetable ghee) is carried out in the presence of………..(name of catalyst).

The first step in the manufacture of nitric acid is the catalytic oxidation of ammonia. What is the name of the catalyst?

A catalyst promoter……….. The efficiency of a catalyst while a poison…………….. The efficiency of the catalyst.

(i) The flow chart below shows steps in the Contact process or the manufacture of sulphuric acid : (ii) Write equations for : (1) The roasting of iron pyrites. (2) Formation of sulphur trioxide from sulphur dioxide.(III) (3) Platinum was the catalyst used in the conversion of sulphur dioxide to sulphur trioxide. What is the common name of the catalyst used nowadays ? (4) Give the formula of oleum. (5) Name the substance which is added to change oleum into sulphuric acid.

In the industrial preparation of ammonia by Haber process from nitrogen and hydrogen, the reaction is carried in the temperature range of 450^@C to 500^@C and in a pressure range of 200 atm to 300 atm. Now answer the following question. What is the name of the catalyst used in the reaction?

A catalyst :