Water wets wood, whereas mercury does not. Give reason.

Does sound needs a medium to travel? Give reasons .

Assertion : Phenol undergoes Kolbe's reaction whereas ethanol does not . Reason : Phenoxide ion is more basic than ethoxide ion .

(a) What length of water column is equivalent to 0.76 m of mercury column ? State the assumption made in your calculation. (b) Can water be used as barometric liquid ? Give a reason.

Frenkel defect does not change the density of the ionic crystal whereas, Schottky defect lowers the density of ionic crystal. Give a reason.

Give reasons Argon does not react.

Water is used in hot water bottles for fomentation. Give a reason.

Electrolysis of KBr (aq) gives br, at anode but of KF (aq) does not give F_(2) . Give reason for disparity in behaviour.

Carbon tetrachloride does not conduct electricity . Give reason .

A male honeybee has 16 chromosomes whereas, its female has 32 chromosomes. Give one reason.

A male honeybee has 16 chromosomes whereas, its female has 32 chromosomes. Give one reason.