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Subject :NSO    Class : Class 8
Four experiments on rusting are shown below.

fig5.eps

Which two experiments can be used to show that air is needed for iron to rust?

(A) 1 and 3

(B) 1 and 4

(C) 2 and 3

(D) 2 and 4


Please explain solution for this question. The answer given by Sofolympiadtrainer site is B. I believe it should be C.

Ans 1: (Master Answer)

Class : Class 1
The correct answer is C.

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