Question

Multiple choice questions:


1) Copper and brass articles are coated with ______.

a) tin

b) iron

c) Coal


2) Bursting of a balloon is a ________ change.

a) fast

b) slow

c) Reversible


3) A _______ layer is seen to form on a copper article.

a) reddish

b) greenish

c) black


4) Which of the following causes corrosion?

a) Oxygen

b) Moisture

c) Vapours of chemicals

d) All of the above.

please tell the answer
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Answer 1

1. (a) tin

2. (a) fast

3. (a) reddish

4. (d) all the above

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Answer 2

Answer:

1-

ans-tin

2-

ans Bursting of the balloon is an irreversible physical change

3-

ans Turquish green

4-

ans Causes of Corrosion

Metal corrodes when it reacts with another substance such as oxygen, hydrogen, an electrical current or even dirt and bacteria. Corrosion can also happen when metals like steel are placed under too much stress causing the material to crack.

Explanation: