Which of the following statements is/are false? P. CuCl₂ is used as a catalyst in the manufacture of ammonia by Haber process. Q. CuCl exhibits blue colour in aqueous solution. R. Fractional crystallisation of metals to get maximum pure form is known as zone-refining.

P. Iron (Fe) is used as a catalyst in the manufacture of ammonia by Haber process. CuCl₂ is used as catalyst in Deacon process for the preparation of Cl₂ from HCl. Q. CuCl in aqueous solution form Cu⁺ ions, which possess no colour due to the presence of completely filled d-orbitals. R. Zone melting is a group of techniques used to purify an element or a compound/metal or control its composition by melting a short region (i.e. zone) and causing this liquid zone to travel slowly through a relatively long ingot, or charge of the solid. As the zone travels, it redistributes impurities along the charge. The final distribution of the impurity depends on its distribution in the starting charge of material. This method is based on fractional crystallisation and so it is also called as zone-refining. Hence, both the statements P and Q are false.