Chemical reactions and equations class 10 mcq (multiple ...
Question 1. Which of the following reactions involves the combination of two elements :(a)CaO + CO 2> CaCO 3 (b)4Na + O 2> 2Na 2 O (c)SO 2 +(1/2)O 2> SO 3 (d)NH 3 + HCI > NH 4 CI Question 2. When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphate is obtained and the sulphuric acid so formed remains in the solution.