Identify the following as mixture or compound. [2 MARKS]

(i) blood
(ii) common salt
(iii) sugar
(iv) brass

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Solution

Identification : 0.5 Mark each

(i) Blood - colloid.

(ii) Common salt - compound.

(iii) Sugar - compound.

(iv) Brass - alloy mixture.

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Identify the following as mixture or compound. [2 MARKS]

(i) blood
(ii) common salt
(iii) sugar
(iv) brass

(a) What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures.

(b) Classify the following into elements, compounds and mixtures :

Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, Sea-water, Chalk

Name the method that can be used for separating the following mixture:
(i) Sand and husk

(ii) Wheat, sugar and stalk

(iii) Water and petrol

(iv) Rice and salt

K_{2} C O_{3} (I), M g C O_{3} (I I), C a C O_{3} (I I I), B e C O_{3} (I V)

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