330 350K Ni 4CO Ni CO → 450 470K Ni CO Ni 4CO → The above reactions are of the purification of Ni by

Mond’s process is used for the purification of Ni. 330 350K 4 Ni 4CO Ni CO → 450 470K 4 Ni CO Ni 4CO → 148. van-Arkel method is useful in the removal of all impurities of …I… and …II… present in the metals like Zn and Ti. Here, I and II refer to (a) oxygen and nitrogen (b) oxygen and carbon (c) carbon and nitrogen (d) carbon and silicon Van-Arkel method is useful in the removal of all impurities of oxygen and nitrogen present in the metals like Zn and Ti. 149. Usually copper is added to gold and silver to be used in jewellery to (a) increase the hardness (b) increase ma