Question

d) Four nails are added to four test tubes A, B, C, D as shown.
А
Boiled water
+ oil layer
B
Salt water
с
Moist air
D
Dry air
(i) Identify the test tube with the nail that would rust the least? Why?
(ii) Identify the test tube with the nail that would rust the fastest? Why?​

Answer 1

Answer:

(i). boiled air + oil layer

(ii). moist air

Explanation:

in first case the nail is having no contact with air at all

in second case the nail is having both air and water to rust quickly

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Answer 2

The iron nail will rust only in 2nd test tube because it needs proper amount of moisture and air to rust