What would happen to a hole in a metal sheet, when the sheet is heated?

It decreases in size.

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It increases in size.

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No change is seen.

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First increases and then decreases.

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Solution

The correct option is B It increases in size.
When we heat the plate, all the constituent molecules vibrate more. The molecules of the plate at the rim of the hole also vibrate. Now if the hole shrinks, the molecules at the rim will come closer to each other, which is not possible as they are vibrating more. So the molecules must move apart i.e. the hole would expand.

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On moving from left to right in a period in the periodic table, the size of the atom.

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Assertion: The metallic character increases as we go down the group.

Reason: Increase in size decreases the ionisation energy.

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