Multiple choice --- one best answer ... one point each. ___ Hydrogen bonding is

Question

Multiple choice --- one best answer ... one point each. ___ Hydrogen bonding is observed in molecules containing hydrogen attached to highly electronegative atoms highly electropositive atoms any atoms only oxygen ___ the equilibrium vapor pressure of a few liters of a liquid is dependent upon the temperature only the mass of the liquid the volume of the liquid the surface area of the liquid ___Which of the following molecules has the most polarity H_2 O CCI_4 N_2 CO_2 In which pair do both compounds exhibit predominantly ionic bonding SO_3 and HCl KNO_3 and CaO NaF and H_2 O KCI and CO_2

Explanation / Answer

1)

we know that

A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen (H) atom bound to a highly electronegative atom

so

the answer is

a) highly electronegative atoms

2)

we know that

mass of liquid , volume and surface area has no effect on vapor pressure

now

Vapor pressure increases with increase in temperature.

This is because with an increase in temperature, rate of evaporation also increases

so

the answer is

a) the temperature only

3)

N2 , there is a bond between same atoms

so no polarity in N2

now

consider the electronegative values of common atoms

H = 2.1 , O = 3.5 , Cl = 3 , C = 2.55

we can see that

C02 has more polarity

so

the answer is

d) C02

4)

S03 has covalent bonding

both KN03 and CaO are ionic

H20 is predominantly covalent

C02 is covalent

so

the answer is

b) KN03 and CaO

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