Density of ice is lower than that of water.

Assertion: Density of ice is less than that of water. Reason: In ice H_(2)O molecules are more closely packed than in water.

Ice is lighter than water, but entropy of ice is less than that of water. Explain.

The electron affinity of nitrogen is lower than that of carbon because

Justify the following: The electron gain enthalpy of 'F' is lower than that of 'Cl .

The first ionization enthalpy of sodium is lower than that of magnesium but its second ionisation enthalpy is higher than that of magnesium. Explain.