Question

Statement - I : Plaster of Paris is

stored in moisture proof containers.

Statement - II : Plaster of Paris on

reaction with water changes into a

hard solid gypsum.

Select the correct answer from

the options given below :

(1) Statement - I is true,

Statement - II is false.

(2) Statement - I is false,

Statement - II is true.

(3) Both Statements are true and

Statement - II provides

explanation to Statement - I

(4) Both Statements are true but

Statement - II does not provide

explanation to Statement - I​

Answer 1

Answer:

option 4 is correct

its is true that pop stored in moisture but when it react with 3/2 mole of water molecules then it changes into gypsums

Answer 2

Answer:

(3) both statement are true

Explanation:

Plaster of paris should be kept in moist proof containers otherwise it will react to become hard solid Gypsum.

On mixing with water, plaster of paris takes up water of crystallization to form orthorhombic calcium sulphate dihydrate. This sets to a hard mass which is monoclinic calcium sulphate dihydrate or gypsum.