Hint

Nicotine is a substance in cigarette which makes difficult to
make one stop smoking. This can be derived by burning.
Options B,C,D will not reduce this nicotine

Hint

SOLUTION:

Crystallization is required the most in industries where the
purity of their products is important e.g in the manufacture of
drugs and in sugar production. Options B,C and D do not
undergo crystallization

Hint

SOLUTION:

Iron is galvanized with zinc covering to protect it against
corrosion. Option A, B, D are the main reasons iron is
galvanized

Hint

SOLUTION:

Washing under pressure is an action in the industrial
production of H. Options B,C,D will not yield Co and H

Hint

SOLUTION:

The ozone layer or ozone shield refers to a region of Earth’s
stratosphere that absorbs most of the Sun’s ultraviolet (UV)
radiation. It contains high concentrations of ozone (O3) relative
to other parts of the atmosphere, although still very small
relative to other gases in the stratosphere

Hint

SOLUTION:

Vulcanizer is the removal of double bend in a chemical
reaction. Option A,B,D can not be removed by vulcanizer

Hint

SOLUTION:

HeSO is the acid used in the electrolysis of water. Option
A,B,D are concentrated acid and they will react with the water

Hint

SOLUTION:

Efflorescence is a process of long exposure to the atmosphere
which favors salt loss of water. Options B, C, D are not related
to loss of water

Hint

SOLUTION:

Ozone means Oz as the atomicity is 3. Option A,B,D cannot
give ozone because their atomicity is not 3

Hint

SOLUTION:

4

Helium has the greatest ionization energy because they are
less stable. Options B,C,D have low ionization energy because
one more stable and do not react easily

Hint

SOLUTION:

Vander Waals are the weakest attractive forces that exist
between two molecules.

Hint

Sulphur is an element that burns with a strongly explosive
smell, as a result it is explosive smell

Hint

SOLUTION:

Rays travels in straight lines and finds its way through any
opening available. It could be refracted, reflected or
transmitted based on any obstacle. Option A,B,C are not the
reason why the cathode are coasted shadows

Hint

SOLUTION:

Sodium hydrogen trionocarbonate iv is the only distinguishing
reagent between ethanoic and ethanol. Option A, B, D are not
conspicuous in distinguishing between ethanoic and ethanol

Hint

SOLUTION:

Discharge tube with central cathode is an apparatus for
producing cathode rays and positive rays. Option A,B,C will not

yield cathode rays and positive rays

Hint

SOLUTION:

Nitrogen has an electronic configuration of 7 i.e
1s2 2ps2 2p3. option A,C,D are chlorine 17, calcium 20, neon
10

Hint

Calcium is the only metal that burn with brick red flame. Option
A,C,D will not burn with brick red flame rather burn with brick
blue flame

Hint

Hint

Hint

SOLUTION:

2.0 mole of Q ions require the largest quantity of electricity
for discharge at an electric.

Hint

SOLUTION:

Uranium is common nuclear because of its less stability as a
result has a great tendency to increase energy than. Options
B,C,D which are not stable

Hint

SOLUTION:

The oxidation number is from h to O as a result of release of
sulphur.

Hint

The number of isomers C6H14 cm is 5.

Hint

Fractionating column contains petrol with different densities.

Hint

The oxidation state of K2Cr2O7 is +6. OTHER optionS  are the
oxidation state of other elements like O7,C14,

Hint

SOLUTION:

Na, Mg, s and Ar one elements that belong to third period of
the periodic table. Option A,B,C belong to the other period in
the periodic table, second period