6) Compared to its crystalline form, glass is generally: a) more dense b) less d

Question

6) Compared to its crystalline form, glass is generally:

               a) more dense

               b) less dense

               c) porous

               d) opaque

.

7) In which of the following materials would be the most permeable to nitrogen?

a) Polydimethylsiloxane D(N2) = 3.5 x 10-5 cm2/s

b) Polyimide D(N2) = 1.0 x 10-9 cm2/s

c) Polyisoprene D(N2) = 1.0 x 10-7 cm2/s

d) Polycarbonate D(N2) = 1.0 x 10-8 cm2/s
.

8) Which of the following conducts electricity the least at room temperature and pressure?

a) graphite

b) copper

c) iron

d) polyethylene

Please answer all of them without guessing!!! Thanks

Explanation / Answer

(6)

Option (b) is correct answer. Glass is less dense than parent crystal.

(7) Option (a) is correct answer. Because Defusivity (D) is highst for Polydimethylsiloxane.

D(N2) = 3.5 x 10-5 cm2/s

(8) Optio (d) i.e; Polyethylene is correct answer.

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