Roasting of metallurgical ores is done mainly to ___________________?

Question: Molecular weight of plastics ranges from
[A].

5000 to 10000

[B].

20000 to 250000

[C].

500 to 5000

[D].

106 to l09

Answer: Option B

Explanation:

No answer description available for this question.

Question: Permanent hardness of water can be removed by
[A].

simply boiling.

[B].

adding alum.

[C].

passing it through cation & anion exchangers.

[D].

all (a), (b) and (c).

Answer: Option C

Explanation:

No answer description available for this question.

Question: Chemical formula of oleum is
[A].

H2SO3

[B].

H2SO4

[C].

H2S2O7

[D].

H2SO7

Answer: Option C

Explanation:

No answer description available for this question.

Question: Glauber’s salt is chemically
[A].

calcium sulphate

[B].

potassium sulphate

[C].

potassium chlorate

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Dacron is a
[A].

condensation product of hexam-ethylene diamine and adipic acid.

[B].

thermosetting material.

[C].

condensation product of dimethyl terephthalate and ethylene glycol.

[D].

none of these.

Answer: Option D

Explanation:

No answer description available for this question.