Select the correct statements.
(`I`) Greater is humidity, lesser will be rate of evaporation of water.
(`II`) Greater is humidity, lesser will be density of air.
(`III`) If room temperature `=` dew point, realtive humidity `= 100%`.
(`IV`) Dew point is the temperature at which the gas a given atmospheric condition becomes staturted with `H_(2)O` (`v`)

Relative humidity id defind as the ration of partial pressure of water in air at a given temperature to the vapour pressure of water at that that temperature Calculate the mass of water per litre air at (a) 20^(@)C and 45% relative humidity (b) 0^(@)C and 95% relative humidity (c ) Discuss wether temperature or relative humidity has the greater effect on the mass of water vapour in air Given P_(H_(2)O)^(@) =17.5 torr at 20^(@)C and 4.58 torr 0^(@)C .

Under which of the following conditions, the absorption of water mainly takes place by active transport? (i) Low humidity (ii) Low temperature (iii) High temperature (iv) High humidity

Heat of neuralisation is amount of heat evolved or absorbed when 1g- equivalent of an acid reacts with 1g- equivalent of a base in dilute solution . If weak acid or weak bae are neutralised, the heat released during neutralisation is somewhat lesser than -13.7kcal or -57.27 kJ . Het of neutralisation is also referred as heat of formation of water from H^(+) and OH^(-) ions i.e., H^(+)+OH^(-) rarr H_(2)O, DeltaH=-13.7kcal. 200mL of 0.1M NaOH is mixed with 100mL of 0.1M H_(2)SO_(4) in 1 experiment. In II experiment 100mL of 0.1M NaOH is mixed with 50mL of 0.1M H_(2)SO_(4) . Select the correct statements: (1) heat liberated in each of the two reactions is 274cal . (2) heat liberated in I is 274 cal and in II is 137 cal . ,brgt (3) temperature rise is I reaction is equal to the temperature rise in II . (4) temperature rise in I reaction is equal to the temperaure rise in II

Refer to the given graph showing relationship between temperature and enzyme action. Select the correct statement regarding 'A' and 'B'. (i) 'A' shows the rate at which reaction decreases due to denaturation of enzyme molecules. (ii) 'B' shows rate at which reaction increases due to decreased kinetic energy of substrate. (iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall. (iv) 'B' shows rate at which reaction increases due to increased kinetic energy of substrate and enzyme molecules.

Refer to the given graph showing relationship between temperature and enzyme action. Select the correct statement regarding 'A' and 'B'. (i) 'A' shows the rate at which reaction decreases due to denaturation of enzyme molecules. (ii) 'B' shows rate at which reaction increases due to decreased kinetic energy of substrate. (iii) As temperature rises, more and more enzyme molecules are denatured and 'A' appears to fall. (iv) 'B' shows rate at which reaction increases due to increased kinetic energy of substrate and enzyme molecules.