Page 1 - PRACTICE WORKSHEET

SAI International School
Subject-Chemistry

Cl-IX
Topic- Chapter1,2, 3 and cathode and anode rays, Thomson’s model
of an atom

Practice Worksheet

Q.1 Seema visited a Natural Gas Compressing Unit and found that the gas can be
liquefied under specific conditions of temperature and pressure. While sharing her
experience with friends she got confused. Help her to identify the correct set of
conditions.
(a) Low temperature, low pressure
(b) High temperature, low pressure
(c) Low temperature, high pressure
(d) High temperature, high pressure

Q2. Choose the correct statement of the following.
(a) Conversion of solid into vapours without passing through the liquid state is called
vaporisation.
(b) Conversion of vapours into solid without passing through the liquid state is called
sublimation.
(c) Conversion of vapours into solid without passing through the liquid state is called
freezing.
(d) Conversion of solid into liquid is called sublimation.

Q3 Two substances, A and B were made to react to form a third substance, A2B
according to the following reaction 2A + B → A2 B. Which of the following statements
concerning this reaction are incorrect?
(i) The product A2B shows the properties of substances A and B.
(ii) The product will always have a fixed composition.
(iii) The product so formed cannot be classified as a compound.
(iv) The product so formed is an element.
(a) (i), (ii) and (iii)

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