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1.
A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?
2.
Sodium carbonate is a basic salt because it is a salt of
3.
Calcium phosphate is present in tooth enamel. Its nature is
4.
Which of the following salts does not contain water of crystallisation?
5.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
6.
During the preparation of hydrogen chloride gas 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
7.
What happens when a solution of an acid is mixed with a solution of a base in a test tube?
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place.
(i) The temperature of the solution increases
(ii) The temperature of the solution decreases
(iii) The temperature of the solution remains the same
(iv) Salt formation takes place.
8.
Curd cannot be stored in
(z) Brass vessel
(ii) Copper vessel
(iii) Steel
(iv) Bronze
(z) Brass vessel
(ii) Copper vessel
(iii) Steel
(iv) Bronze
9.
Egg shell is made up of
10.
An aqueous solution with pH = 1 is