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Subject :NSO    Class : Class 7

Observe the given experimental setup carefully.

Which of the following statements is/are correct?
1. The nails in flask I will rust because both water and oxygen are available.
2. Nails in flask II will not rust because tap water contains impurities.
3. Nails in flask III will not rust because both oxygen and water are not available.

A2 only
B1 and 3 only
C3 only
DNone of these


Answer should be C as it the nails are covered with calcium chloride which removes water vapour from air so statement 3 should be correct

Ans 1:

Class : Class 8
does none of these mean none of the options are correct or none of the statements are correct?

Ans 2:

Class : Class 7
Isn't C right? Calcium chloride is a dehydrating agent, it removes water vapour from air , no water means no rust. and in the statement it says "cause there is no H2O OR O2 it will not rust"

Ans 3:

Class : Class 7

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