The bodies of living organisms contain……….% water…….
a) 70-90
b) 90-100
c) 20-30
d) 50-60
Explanation: that’s why there is no life without water
Protoplasm cannot survive if its water content is reduced as low as…….percent.
a) 20
b) 30
c) 10
d) 5
Water is a …….molecule.
a) polar
b) non-polar
c) ionic
d) coordinate
Explanation: O is partial negative and H is partial positive in water molecule
Which of the following is universal solvent?
a) alcohol
b) water
c) CCl4
d) benzene
Explanation: water dissolve almost all polar and ionic substances
Why water is regarded as “universal solvent”?
a) because of strong ionic bond
b) because of polarity
c) because of its vapor pressure
d) because of its heat capacity
Which of the following intermolecular force of attraction is found among water molecules?
a) di-pole di-pole interaction
b) London dispersion
c) Vander Wall’s forces
d) hydrogen bonding
Explanation: the attraction b/w electron deficient hydrogen and lone pair of electronegative oxygen atom is called hydrogen bonding
