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Excess of iron oxide in the bricks makes them _________ in colour.

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Excess of iron oxide in the bricks makes them _________ in colour.

(a) Red

(b) Yellow

(c) Dark blue

(d) White

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The correct answer is (c) Dark blue

Explanation: Excess of iron oxide in the bricks makes them dark blue or blackish in colour. However, if its quantity is comparatively less, the bricks will turn yellowish in colour.
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