A student prepared 20% sodium hydroxide solution in a beaker containing water. The observations noted by him are given below.
I. Sodium hydroxide is in the form of pellets.
II. It dissolves in water readily.
III. The beaker appears cold when touched from outside.
IV. The red litmus paper turns blue when dipped into the solution.
The correct observations are:
I, II, and III
II, III and IV
III, IV and I
III, IV and I
D.
III, IV and I
Sodium hydroxide is in the form of pallets and it readily dissolves in water to form a solution. Since, it is basic in nature, NaOH turns red litmus paper blue.
