In three test tubes P, Q and R iron nails, water, oil and anhydrous calcium chloride is taken. Among these test tubes, in which test tubes corrosion of nails will not take place?

P, Q and R

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P and R

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P and Q

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Q and R

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Solution

The correct option is C Q and R
In test tubes Q and R, corrosion of nails will not take place.
For corrosion to take place, air ( or oxygen), water and iron, all three should be in contact.
In test tube Q, layer of oil separates air from nails and boiled distilled water.
In test tube R, anhydrous calcium chloride ensures that no moisture is present.

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Similar questions

Take some clean iron nails and place them in the three test tubes prepared as under:

Test tube A: Contains boiled water and a thin layer of oil.

Test tube B: Contains dry air.

Test tune C: Testube half-filled with water.

All the test tubes are tightly closed after placing the nails. After some time what will you observe?

Iron nails rust in test tube A but they do not rust in test tubes B and C. What inferences can be drawn from the given observations ?

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