81.The abnormally high boiling point of water is primarily due to
- A. ionic bonding
- B. covalent bonding
- C. dative bonding
- D. hydrogen bonding.
82.The energy required to remove an electron from the isolated gaseous atom is known as
- A. electron affinity
- B. bond energy
- C. lonisation energy
- D. electronegativity
83.The group that oxygen belongs to is collectively called
- A. allotropes
- B. halogens
- C. chalcogens
- D. alkenes
84.The ideal gas equation is ___
- A. P=nRT
- B. PR =nVT
- C. PV =gRT
- D. V=kT
85.The number of atoms in one mole of a substance is equal to
- A. the atomic number
- B. the Avogadro’s number
- C. number of neutrons
- D. number of electrons
86.The number of electrons in the outermost shell of the atom represents its
- A. period
- B. number of shells
- C. group
- D. atomic number
87.The number of protons or electrons of an atom represents its
- A. electronegativity
- B. period
- C. number of shells
- D. atomic number
88.The partial pressure of oxygen in a sample of air is 500 mmHg. If the total Pr pressure 780 mmHg, what is the mole fraction of the oxygen?
- A. 0.64
- B. 5.73
- C. 1.56
- D. 0.70
89.The periodic classification of the elements is an arrangement of the elements in order of their
- A. atomic weights
- B. isotopic weights
- C. molecular weights
- D. atomic numbers
90.The process of changing one element into another is called
- A. radioisotope
- B. radioactivity
- C. dating
- D. transmutation
91.The shapes of CO₂, H₂O and CH4 respectively are
- A. bent, linear and tetrahedral
- B. bent, tetrahedral and linear
- C. tetrahedral, linear and bent
- D. linear, bent and tetrahedral
92.This compound exhibits ionic bonding
93.This type of bonding involves overlapping of orbitals during which electrons are shared
- A. hydrogen bonding
- B. covalent bonding
- C. ionic bonding
- D. metallic bonding
94.Which one of the following changes is physical?
- A. Adding iron filings to aerated
- B. Adding sodium metal to water
- C. Cooling a solution of iron(II) sulphate to obtain the hydrated salt
- D. Cooling water to obtain ice
95.A side effect of soft water is that
- A. it gives offensive taste
- B. excess calcium is precipitated
- C. it encourages the growth of bacteria
- D. it attacks lead contained in pipes
96.Ammonia is very soluble in water because it is a /an molecule
- A. non-polar
- B. polar
- C. reactive
- D. basic
97.Citrus fruits such as lemon and grape taste sour because they contain
- A. ascorbic acid and citric acid
- B. citric acid and ascetic acid
- C. citric acid and dilute HCl
- D. citric acid and salicyclic acid
98.Soap lather is an example of a colloid in which a
- A. liquid is dispersed in gas
- B. solid is dispersed in liquid
- C. gas is dispersed in liquid
- D. liquid is dispersed in liquid
99.The air around a petroleum refinery is most likely to contain.
- A. CO₂, SO₃ and N₂O
- B. CO₂, CO and N₂O
- C. SO₂, CO and NO₂
- D. PH₃, H₂O and CO₂
100.The difference between colloids and suspensions is brought out clearly by the fact that while colloids
- A. do not scatter light, suspensions do
- B. can be separated by filtration, suspensions cannot be so separated
- C. can be separated by a membrane, suspensions cannot
- D. do not settle out on standing, suspensions do