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Earn 100

Quartz is a crystalline variety of
(a)Silica
(b)Sodium silicate
(c)Silicon carbide
(d)Silicon

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Important Questions on Solid State
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Given below are two statements. One is labelled as
Assertion and the other is labelled as Reason .
Assertion Sharp glass edge becomes smooth on heating it up to its melting point.
Reason The viscosity of glass decreases on melting.
Choose the most appropriate answer from the options given below.

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(A) Crystalline solids have long range order.
(B) Crystalline solids are isotropic.
(C) Amorphous solid are sometimes called pseudo solids.
(D) Amorphous solids soften over a range of
temperatures.
(E) Amorphous solids have a definite heat of fusion. Choose the most appropriate answer from the options given below.

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.
. Barium chloride dihydrate
. Rubber
. Solid cake left after the distillation of coal tar.

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