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Prevention of Corrosion

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Question

Solve the following crossword puzzle:
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2. the process of coating a thin layer of tin on utensils
4. An alloy of iron
5. A reddish brown, soft, porous, flaky coating on iron articles

Down
1. The common name of acetic acid
3. The colour of crystals of copper sulphates

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Q. A student placed a clean iron nail in blue coloured copper sulphate solution for a considerable time. He observes that :
(1) iron nail gets green coating
(2) iron nail gets brown coating
(3) iron nail gets no coating
(4) iron nail gets blue coating

The process of coating a layer of zinc over iron articles is known as __.

During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium (b) tin (c) zinc (d) copper

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Standard VII Chemistry

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