Materials and construction

1

Brass container is suitable for storing

A. aqueous ammonia

B. beer

C. H₂SO₄(95%)

D. phosphoric acid (95%)

Answer

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2

Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by

A. dilute HC1

B. acetic acid

C. concentrated H₂SO₄

D. none of these

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3

Lead pipe is

A. especially resistant to solutions containing H₂SO₄

B. usually joined by burning (e.g. by melting to adjacent pieces with a torch)

C. having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain.

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

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4

Cast iron vessels are not suitable for the storage of

A. freon

B. H₂SO₄ (95%) at room temperature

C. H₂SO₄ (fuming)

D. wet SO₂

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5

Which of the following comprises of hydrocarbons ?

A. Mica flakes

B. Glass

C. Rubber

D. None of these

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