Important Salts in Daily Life - Preparation and Uses of Sodium Hydroxide

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:

(A) I, II, and III

(B) II, III and IV

(C) III, IV and I

(D) I, II and IV

Sodium hydroxide is termed an alkali while Ferric hydroxide is not because ______.

An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

We need 20% aqueous solution of sodium hydroxide for the study of saponification reaction. When we open the lid of the bottle containing solid sodium hydroxide we observe it in which form?

(A) Colourless transparent beads

(B) Small white beads

(C) White pellets/flakes

(D) Fine white powder

Chlorine gas was prepared using electrolysis of brine solution. Write the chemical equation to represent the change. Identify the other products formed in the process and give one application of each.

A student Prepared 20% sodium hydroxide solution in a beaker to study saponification reaction. Some observations related to this are given below :

(I) Sodium hydroxide solution turns red litmus blue

(II) Sodium hydroxide readily dissolves in water

(III) The beaker containing solution appears cold when touched from outside

(IV) The blue litmus paper turns red when dipped into the solution

The correct observations are :-

(A) I, II and IV

(B) I, II and III

(C) only III and IV

(D) only I and II

NaOH is obtained by electrolysis of ___________.

Sodium hydroxide is used ____________.