PDF chapter test TRY NOW

Write brief answers to the following question:
 
Which of the following represents a correct chemical formula? Name it.
(a). \(CaCl\)
(b). \(BiPO_4\)
(c). \(NaSO_4\)
(d). \(NaS\)
 
(a). Valency of Ca is , and Cl is 1. Hence, the correct formula for calcium chloride is \(CaCl_2\)​.
 
(b). Valency of Bi is 3 and (\(PO_4\)​), i.e. phosphate ion is also . Hence, the formula of bismuth phosphate is \(BiPO_4\).
 
(c). Valency of Na is and sulphate, \(SO_4\)​ is 2. Hence, the formula of sodium sulphate is \(Na_2​SO_4\)​.
 
(d). Valency of Na is 1, and sulphur is . Hence, the formula of sodium sulphide is \(Na_2​S\).