A thousand ways to pass basic chemistry examination

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
  • A. H₂0
  • B. H₂
  • C. KCl
  • D. NH₃
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