QUESTIONS AND ANSWERS FOR STUDENTS
- In a chemical reaction, the change in the
concentration of a reactant with time is
a. rate of reaction
b. order of reaction
c. enthalpy of reaction
d. entropy reaction - 200cm3 of a gas at 250oC exerts a pressure of
700 mmHg. Calculate its pressure if its volume
increases to 350cm3 at 75oC.
a. 467.11 mmHg
b. 400.00 mmHg
c. 1430.54 mmHg
d. 342.53 mmHg - Ethyne is passed through a hot tube containing
organo-nickel catalyst to produce
a. ethanol
b. benzene
c. polythene
d. isoprene - Beryllium and aluminium have similar properties
because they
a. belong to the same period
b. are positioned diagonally to each other
c. belong to the same group
d. are both metals - The Mathematical expression of Ph is
a. log10 H3O+
b. log10 1/0H-
c. log10 1/H3O+
d. log10 0H- - On exposure to the atmosphere, a hydrated salt
loses its water of crystallization to become
anhydrous. This phenomenom is reffered to as:
a. hygroscopy
b. hydrolysis
c. deliquescence
d. efflorescence - The nitrogen obtained from air has a density
higher than the one from nitrogen-containing
compounds because the one from air is
contaminated with?
a. rare gas
b. carbon [iv] oxide
c. oxygen
d. water vapour - Zn[s] + CUSO4[aq] ——–> ZnSO4[aq] + Cu[s]
a. +1 to +2
b. +1 to + ±3
c. 0 to +2
d. 0 to + 4 - The process of converting starch to ethanol is
a. cracking
b. fermentation
c. oxidation
d. distillation - In the electrolytic extraction of calcium chloride,
the cathode is
a. zinc
b. platinum
c. iron
d. graphite - Due to the unstable nature of ethyne, it is stored
by dissolving
a. ethane-1,2-diol
b. ethanoic acid
c. propanone
d. propanol - Which subject are you doing?
a. C.R.S
b. Physics
c. English
d. Chemistry - The petroleum fraction that is used in heating
furnaces in industries is
a. diesel oil
b. kerosene
c. lubricating oil
d. gasoline - In the extraction of sodium from fused sodium
chloride, the anode is made of platinum because?
a. sodium is formed at the anode
b. sodium does not react with platinum
c. chlorine does not react with platinum
d. chlorine is formed at the anode. - A Mixture is different from a compound base
because?
a. The properties of a compound are those of its
individual constituents while those of a mixture differ
from its constituents
b. the constituents of a compound are chemically
bound together while those of a mixture are not.
c. a mixture can be represented by a chemical
formula while a compound cannot
d. a mixture is always homogenous while a
compound is not - The basicity of CH3COOH is
a. 4
b. 2
c. 3
d. 1 - The color of litmus in a neutral medium is
a. purple
b. yellow
c. orange
d. pink - How Many protons, neutrons and electrons
repectively are present in the element Co?
a. 27, 33 and 33
b. 27, 33 and 27
c. 60, 33 and 60
d. 33, 27 and 27 - How many faraday of electricity is required to
produce 0.25 mole of copper?
a. 1.00F
b. 0.05F
c. 0.50F
d. 0.01F - What is the percentage of sulphur in sulphur [iv]
oxide?
a. 50%
b. 25%
c. 66%
d. 40% - Which of the following salts will turn blue litmus
red?
a. Soduim tetrahydroxozincate[ii]
b. sodium trioxocarbonate[iv]
c. zinc chloride hydroxide
d. potassium hydrogentetraoxosulphate[iv] - The dispersion of a liquid in a liquid medium will
give
a. an emulsion
b. a gel
c. an aerosol
d. a fog - Which of the following will liberate hydrogen from
dilute tetraoxosulphate[iv] acid?
a. lead
b. copper
c. gold
d. magnesium - A gas X diffuses twice as fast as gas Y. If the
relative molecular mass of X is 32, Calculate the
relative molecular mass of Y.
a. 128
b. 16
c. 64
d. 8 - Polystrene is widely used as packaging materials
for fragile objects during transportation because of
its
a. lightness
b. high density
c. high compressibility
d. low density - Glycerol or Propane- 1,2,3- triol is obtained from
production of soap.
a. propanol
b. glycerol
c. methanol
d. ethanol - Flourine does not occur in the state in nature
because of its high reactivity
a. it is inert
b. it is a poisonous gas
c. of its high reactivity
d. it belongs to the halogen family - The polymer used in making car rear lights is
a. polystyrene
b. Perspex
c. polyacrylonitrile
d. Bakelite - A Compound that gives a brick-red colour to a
non luminous flame is likely to contain
a. Calcuim ions
b. copper ions
c. aluminium ions
d. sodium ions - If the the difference in electronegativity of
elements P and Q is 3.0. The bond that will be
formed within them is
a. Co-ordinate
b. Metallic
c. Ionic
d. Covalent
