Question

1.when a liquid X is added to a grey, powdery is substance y slowly sets into a hard mass .A thick paste of substance y and sand made in liquid X is used for plastering the walls of houses.

a. what could the liquid X be?

2. An iron rim is made slightly smaller than the wooden wheel (around which it is to be fitted)
This iron rim is heated uniformly due to which it undergoes a change p and can be easily put around the wooden wheel . When cold water is poured over this hot rim, it undergoes another change Q and fits tightly over the wooden wheel. After a considerable times a change R takes place in the iron rim due to which a red brown coating is formed on it?

a. what are the changes p,q and r
b. out of p ,Qand R with change/ changes is/ are reversible ?​

Answer 1

Answer:

b is the proper answer for this question