EASY
9th CBSE
IMPORTANT
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Which of these can be classified as elements?
Salt, water, hydrogen, sodium, oxygen
50% studentsanswered this correctly
Important Questions on Is Matter around Us Pure
EASY
9th CBSE
IMPORTANT
Identify what will happen if wheat flour is added to a glass of water and stirred properly?
MEDIUM
9th CBSE
IMPORTANT
Solid-solid homogeneous mixture can be separated by
EASY
9th CBSE
IMPORTANT
Air is a mixture, why, choose proper reasons:
I. It has no fixed chemical formula
II. It varies in its composition
III. It involves energy change
EASY
9th CBSE
IMPORTANT
Which of the following are not physical changes?
(i) Juice freezes in refrigerator
(ii) Gasoline is ignited
(iii) Rusting of iron rod
(iv) Water evaporates from the river
EASY
9th CBSE
IMPORTANT
Which of the given alloys does not have only metals as its constituents?
(i) Amalgam (ii) Invar (iii) Type metal (iv) Steel
EASY
9th CBSE
IMPORTANT
Which statement is / are correct for mixtures?
I. Mixture may contain only solids
II. Mixture may contain only liquids
III. Mixture cannot contain only gases
IV. Substances in different states cannot make a mixture
EASY
9th CBSE
IMPORTANT
The colloidal solution of water in air is / are _____?
EASY
9th CBSE
IMPORTANT
Why water is supposed to be a compound and not a mixture? Choose the correct statements:
I. It has a definite formula.
II. The properties of water are the same as its constituents hydrogen and oxygen.
III. It has a fixed boiling point.
