acids, bases, salts and metals - Category wise Question and Answer Practice Test with Solutions

Question : 26

Plaster of paris is obtained –

a) by adding sulphuric acid to calcium hydroxide

b) by heating gypsum to a very high temperature

c) by adding water to calcium sulphate

d) by heating gypsum to 373 K.

Question : 27 [IAS (Pre) 2005]

With reference to ionic compounds, consider the following statements.

1. Ionic compounds are insoluble in alcohol.
2. Ionic compounds in the solid state are a good conductor of electricity.

a) Only 2

b) Both 1 and 2

c) Only 1

d) Neither 1 nor 2

Question : 28 [IAS (Pre) 1999]

Assertion (A):
To dilute sulphuric acid, acid is added to water and not water to acid.
Reason (R):
Specific heat of water is very high.

a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

b) (A) is true, but (R) is false

c) Both (A) and (R) are true and (R) is the correct explanation of (A)

d) (A) is false, but (R) is true

Question : 29

Match Column-I with Column-II:

a) A – P; B – R; C – S; D – Q

b) A – R; B – P; C – S; D – Q

c) A – Q; B – P; C – S; D – R

d) A – R; B – P; C – Q; D – S

Question : 30

Removal of impurities from ore is known as –

a) calcination

b) crushing and grinding

c) concentration of ore

d) roasting