Question

1
1
4. Prove that:
2 sec20
1 + sin o ' 1-sin e​

Answer 1

Answer:

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QUESTION

A metal ‘X’ acquires a green colour coating on its surface on exposure to air.

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ANSWERS"

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(i)Identify the metal ‘X’ and name the process responsible for this change.

Ans . metal 'X'is a copper.

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(ii) Name and write chemical formula of the green coating formed on the metal.

Ans .This lead to corrosion of cu metal by formation of green coating.

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(iii) List two important methods to prevent the process.

Ans. 1. we should apply grease on the surface of metal time to time.

2. we should apply paint on the surface of metal.

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hope it helps you

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