Assertion :Ice is less dense than liquid water. Reason: Water molecules are non polar.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
In water and ice there are two types of bonds, covalent bonds within the water molecules, and hydrogen bonds between the molecules. Hydrogen bonds are weaker than the covalent bonds.
As the water freezes, the hydrogen bonds start to take a greater part in the bonding, which orders the molecules into a regular crystal structure. This regular structure is not as closely packed as the random liquid structure, which means the water expands slightly, decreasing its density.
Water is an example of a polar molecule since it has a slight positive charge on one side and a slight negative charge on the other. The dipoles do not cancel out resulting in a net dipole.

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