Professor, New Delhi
Time Remaining
Question 1: What happens when a solution of an acid is mixed with a solution of a base in a test tube?
Temperature of the solution decreases
Temperature of the solution increases
Temperature of the solution remains the same
Salt formation takes place
Question 2: Which one of the following salts does not con-tain water of crystallisation?
Blue vitriol
Baking soda
Washing soda
Gypsum
Question 3: When hydrogen chloride gas is prepared on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to
absorb the evolved gas
moisten the gas
absorb moisture from the gas
absorb Cl– ions from the evolved gas
Question 4: Write chemical equations for the reactions involved in obtaining pure alumina from the mineral bauxite which has impurities of iron oxide and silica.
