Question

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Answer 1

Answer:

i) D dry air . because rusting requires air and moisture

ii) C moist air has both air and water

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Answer 2

Answer:

1. Test tube A

2. Test tube B

Explanation:

1. Test tube A because rusting requires oxygen , due to oil layer oxygen does not reach nail so its rusts slowly.

2. Teat tube B because salt water increases the speed of rusting