Question

1) Answer all the questions:

I. Fill in the blanks:
a) The people who work for the development of science are called _______________.

b) The atomicity of phosphorus is ______________.

c) The step by step process involved in doing something is known as ________________.

d) ________________ is used for separating solid constituents of a mixture which differ in

their sizes.

e) A ______________ has a free surface, whereas a _______________ does not.

II. State which of the following statements are true and which are false:
a) Germanium is a metalloid.

b) Only scientists use scientific methods.

c) The change of state from solid to liquid is called condensation.

d) In mixtures, the constituents may be present in any proportion.

e) All gases can diffuse into each other.

III. Write the formulae of the following compounds:
a) Carbon dioxide b) Water

c) Hydrogen chloride d) Lead oxide

IV. Give one word answer:
a) Atomicity of ozone.
b) Who discovered synthetic fibre nylon.

c) An example of chemical preservative.

d) A metal that is liquid under normal temperature and pressure.

e) A compound containing hydrogen, sulphur and oxygen.​

Answer 1

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