______________ glass has the lowest co-efficient of thermal expansion and hence is more heat resistant ?

Question: Catalytic oxidation of toluene produces
[A].

styrene

[B].

phenol

[C].

benzene

[D].

tri-nitro-toluene

Answer: Option B

Explanation:

No answer description available for this question.

Question: Free alkali in a toilet soap is __________ that in a laundary shop.
[A].

less than

[B].

more than

[C].

same

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Na2CO3 is called
[A].

washing soda

[B].

soda ash

[C].

plaster of paris

[D].

calcite

Answer: Option B

Explanation:

No answer description available for this question.

Question: Permanent hardness of water is due to the presence of calcium & magnesium
[A].

bi-carbonates

[B].

sulphates & chlorides

[C].

carbonate

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.