Give reasons for the following :
A. Platinum, gold and silver are used to make jewellery.
B. Sodium, potassium and lithium are stored under oil.
C. Aluminium is a highly reactive metal but still used for making cooking utensils.
D. Carbonate and sulphide ores are usually converted into oxides during the process of extraction. (CBSE 2013, 2014)
Answer:A
Give reasons for the following :
A. Platinum, gold and silver are used to make jewellery. B. Sodium, potassium and lithium are stored under oil. C. Aluminium is a highly reactive metal but still used for making cooking utensils. D. Carbonate and sulphide ores are usually converted into oxides during the process of extraction. (CBSE 2013, 2014)