The filter in the cigarette reduce the nicotine construct by
A. burning
B. absorption
C. evaporation
D. absorption
Answer: A
Nicotine is a substance in cigarette which makes difficult to make one stop smoking. This can be derived by burning
Which of these require crystallization most?
A. Drug making
B. Cement making
C. Paint making
D. Perfume making
Answer: A
Crystallization is required the most in industries where the purity of their products is important e.g in the manufacture of drugs
Iron is often galvanized in order to
A. Make it more malleable
B. Remove the impurities unit
C. Protect it against corrosion
D. Render it passive
Answer: C
Iron is galvanized with zinc covering to protect it against corrosion.
In the industrial production of H2 is removed by (solution)
A. washing under pressure
B. drying over phosphorus (V) oxide
C. passing the mixture to the limewater
D. using ammonical copper (I) chlorine
Answer: A
The gas that is most useful in protecting humans against solar marathon is
A. chlorine
B. ozone
C. carbon IV oxide
D. hydrogen sulphur
Answer: B
The ozone layer or ozone shield refers to a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet (UV) radiation
Vulcanization involve the removal of
A. monometer
B. the single bond
C. the double bond
D. a polymer
Answer: C
Vulcanizer is the removal of double bond in a chemical reaction.
The acid in electrolysis of water is dilute
A. HNO3
B. CH3COOH
C. H2SO4
D. HCl
Answer: C
A small quantity of solid ammonium chloride (NH4Cl) texted gently in a test tube, the solid gradually disappear produce two gases. Later, a white cloudy deposit was absence on the cooler part of the test tube. The ammonium chloride is to have undergo
A. distillation
B. sublimation
C. precipitation
D. evaporation
Answer: B
Sublimation is the transformation of solid gaseous state without passing through the liquid state
When salt loses its water of crystallization to the atmosphere on exposure, the process is said to be
A. efflorescence
B. deliquescence
C. effervescence
D. fluorescence
Correct Option: A
Atomicity of ozone is
A. 1
B. 2
C. 3
D. 4
Answer: C
Ozone means O3 as the atomicity is 3.Which of the noble gases has the greatest ionization energy
A. He
B. Xe
C. Ar
D. Rr
Answer: A
The weakest attractive force that can be observed between two molecules is
A. ionic
B. covalent
C. co-ordinate covalent
D. vander Waals
Answer: D
An elements used in production of matches is
A. nitrogen
B. aluminum
C. copper
D. sulphur
Answer: D
Cathode rays cause an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays
A. are positively charged
B. are negatively charged
C. Have mass
D. travel in straight lines
Answer: D
Flow of current in electrolytes is due to the movement of
A. electrons
B. Holes and electron
C. Ions
D. Charges
Answer: C
A suitable reagent for distinguish between ethanoic and ethanol is
A. bromine water
B. Fehling’s solution
C. sodium hydrogen trioxocarbonate (iv)
D. Ammoniacal silver trioxonitrate(V)
Answer: C
In the discovery of protein, the instrument used is
A. cathode ray tube
B. glass tube and discharge tube
C. discharge tube with terminal cathode
D. discharge tube with central cathode
Answer: D
The above orbital diagram shown the electronic configuration of
A. chlorine
B. nitrogen
C. calcium
D. neon
Answer: B
Nitrogen has an electronic configuration of 7 =
1s2 2ps2 2p3.
Which of the following metals burns with brick red
A. Pb
B. Ca
C. Na
D. Mg
Answer: B
In the production of soap, concentrated sodium chloride solution is added to
A. increase the solubility of soap
B. decrease the solubility of the soap
C. saponify the soap
D. emulsify the soap
Answer: B
A liquid that will dissolve fat is
A. hydrochloric acid
B. calcium hydrochloride
C. kerosene
D.water
Answer: C
Tartaric acid is used industrially to
A. make baking powder
B. make fruit juice
C. remove rust
D. dry substance
Answer: A
P1V1 = P1V1 supports ?
A. Charles’s law
B. Boyles’s law
C. Graham’s law
D. Avogadro’s law
Answer: B
A fixed mass of gas a volume of 92cm3 at 3°C. When will be its volume at 18C if the pressure remains constant?
A. 15.3cm3
B. 87.3cm3
C. 2.0cm3
D. 97.0cm3
Answer: D
V1 ÷ T1 = V2 ÷ T2
T1 = 3 × 273 = 276k
T2 = 18 + 273 = 291k
V1 = 92cm3
V2 = ?
V2 = (V1T2) ÷ T1 = (92 × 291) ÷ 276
= 97.0cm3
Which of the following ion’s requires the quantity of electricity for discharge at an electrode
A. 2.0 mole of Q3+
B. 2.5 mole of R2+
C. 3.0 mole of T–
D. 4.0 mole of Y–
Answer: A
2.0 mole of Q3+ ions require the largest quantity of electricity for discharge at an electric.
Hydrogen can be displaced from a lot alkaline solution by
A. Fe
B. Cu
C. Cn
D. Sn
Answer: A
Which of the following types of alkanols undergo oxidation to produce alkanoic acids.
I. Primary alkanols
II. Secondary alkanols
III. Tertiary alkanols
A. I, II and III
B. I and II only
C. III only
D. I only
Answer: D
Only primary alkanols undergo oxidation to produce alkanoic acid.
Rare gases are suitable because they
A. are monoatomic
B. form ions easily
C. have duplet or octet electronic configuration in the outermost shells in their atoms
D. are volatile gases
Answer: C
A major source of oxide of oxygen is from the burning of
A. coal
B. wood
C. fuel
D. chlorofluorocarbons
Answer: A
Which of the activities is commonly used as a nuclear fuel
A. uranium
B. palladium
C. actium
D. thorium
Answer: A
The leachate of a certain ash is used in local soap because it contain
A. sodium chloride and potassium hydroxide
B. sodium hydroxide
C. potassium hydroxide
D. soluble carbonates and hydrogen carbonate
Answer: B
Sodium hydroxide (NaOH) is made suitable or soap production locally.
All these are electromagnetic waves except
A. White light
B. Photon
C. X-ray
D. Infrared
Answer: B
Cu2S(s) + O2(g) = 2CU(s) + SO22(g)
A. +1 to 0
B. 0 to +2
C. +2 to +1
D. 0 to +1
Answer: A
The oxidation number is from h to O as a result of release of sulphur.
The number of isomers formed by C6H14 is
A. 4
B. 5
C. 2
D. 3
Answer: B
There are basic particles from which matter called be made except
A. Salt
B. Atom
C. Ion
D. Molecule
Answer: A
Salt is a chemical used for varieties of purposes, so it’s not part of matter
The energy value of petrol can be determined by
A. Bomb calorimeter
B. Catalytic cracker
C. Fractionating column
D. Thermometer
Answer: C
What volume of 0.5mldm3 H2SO4 will exactly neutralize 20cm3 of 0.1moldm3 NaOH Solution?
A. 2.0cm3
B. 5.0cm3
C. 6.8cm3
D.8.3cm3
Answer: A
CaVa) ÷ (CbVb) = ratio of acid / ratio of base
0.5Va ÷ (0.1 × 20) = ½
Va = 2.0cm3
A compound contains 40.0% carbon, 6.7% hydrogen and 53.3% oxygen. If the molar mass of the compound is 180, Find the molecular formula [H = 1, C = 12, O = 16)
A. CH2O
B. C3H6O3
C. C6H12O6
D. C6H12O3
Correct Option: C
Solution
C = 40%, 40/12 = 3.33
H = 6.7%, 6.7/1 = 6.7
O = 53.3%, 53.3/16 = 3.33
C = 3.33/3.33 = 1
H = 6.7/3.33 = 2
O = 3.33/3.33 = 1
(CH2O)n = 180
(12 + 2 + 16)n = 180
30n = 180
n = 6
= C6H12O6
An oxidation state of Cr in K2Cr2O7
A. 7
B. 6
C. 5
D. 4
Correct Option: B
Ox no of k=1, Ox no of O =-2
K2Cr2O7 = 0
2(1) + 2 Cr + 7(-2)=0
2 + 2Cr – 14 =0
2Cr = 14-2 = 12
Cr = 12/2 = 6
The elements that belong to the third period of periodic table are
A. Li, Be, Al and D
B. Na, P, O and Cl
C. B, C, N, and O
D. N2, Mg, S and Ar
Answer: D
When sugar is dissolve in tea, the reaction is accomplished by
A. positive change
B. negative entropy change
C. no entropy change
D. a minimum entropy change
Answer: C
No entropy change because the sugar will not change the chemical equivalent of the tea.
NH3(g) + HCl(s) → NH 4Cl (s)
The entropy change in the system above is
A. positive
B. Zero
C. Negative
D. intermediate
Answer: C
Entropy s is a measure of the degree of disorder or randomness of a substance. The entropy charge in the system is negative ie from gas to solid
Detergents are manufacture with strength hydrocarbon chains is to make them
A. soluble
B. biodegradable
C. cheaper
D. foamy
Answer: B
Biodegradable because the straight hydrocarbons are natural and slightly soluble in water.
Which of the following results in the fall of acid rain
A. oxide of lead
B. particulate matter
C. oxides of sulphur
D. gaseous hydrocarbon
Answer: C
The fuming of kettles is caused by the presence in the water of
A. calcium tetraoxosulphate (IV)
B. calcium hydrogentrionocarbonate (IV)
C. calcium hydroxide
D. calcium trioxocarbonate (IV)
Answer: B
A difference between chemical and physical change is that in a chemical change
A. oxygen is consumed
B. heat is supplied
C. the reversible process occurs
D. a new substance is formed
Answer: D
According to the kinetic theory an absence in temperature causes the kinetic energy of particles to
A. decrease
B. increase
C. remain constant
D. be zero
Answer: D
PCL5(g)= PCL3(g) + Cl2(g)
In the reaction above, a decrease in pressure will
A. Decelerate the reaction
B. Increase yield of Pcl3
C. Increase the yield of Pcl5
D. Accurate the reaction
Answer: B
Which of the following gives a precipitation when treated with NaOH Solution?
A. AlCl3
B. NH4Cl
C. Na2CO3
D. CH3COONa
Answer: A
Electronic configuration of an elements 13x in the subsidiary energy level is
A. 1s2 2s2 2p6 3s2 3p1
B. 1s2 2s2 2p4 3p1 3s1
C. 1s2 2s2 2p6 3s2 3p3
D. 1s1 2s2 2p6 3s2 3p4
Answer: A
Alloys are best prepared by
A. electroplating
B. Arc-welding
C. reducing and mixture of their metallic
D. cooking a molten of the metals
Answer: D
Alloy is a metal that consist of two or more metals combined together
In countries where the temperature fall below 273k, salt always spilled on the ray road in order to
A. increase the boiling point
B. increase the density of the ice
C. make the ice impure
D. reduce the freezing point of ice
Answer: Option D
What is the volume of energy required to burn 45cm3 of mixture at S.T.P
A. 135.0cm3
B. 150.0cm3
C. 45.0cm3
D. 90.0cm3
Answer: D
CH4(g) + 2O2(g) → 2H2O(g)
1 volume of methane will react with 90cm3 of oxygen at S.T.P
The substance that is used in the steel industry for the removal of carbon. Sulphur and phosphorus impurities from pig iron is
A. oxygen
B. chlorine
C. nitrogen
D. hydrogen
Answer: A
If glucose is heated on the concentration tetraoxosulphate(iv)acid, it will be dehydrated
A. carbon
B. carbon(iv)oxide
C. ethane
D. ethanol
Answer: A
Rare gases are suitable because they
A. are monoatomic
B. are monoatomic
C. have duplet or octet electronic configuration in the outermost shells in their atoms
D. are volatile gases
Answer : C
Which of the following compounds can be represented by the molecular formula C2 H6O?
A. propanal
B. ethanol
C. methanoic acid
D. glucose
Answer: B
Two equal bulbs, one containing ammonia and the other one opened mouth-to mouth to each other at temperature the entropy in the mixture of gases is likely to
A. remain unchanged
B. increase
C. decrease
D. charge
Answer: A
The bubble remain the same because entropy favors the mixture as it is the degree of randomness or disorderliness.
what is the pH of 0.00lmoldm3 solution of sodium hydroxide
A. 14
B. 13
C. 12
D. 11
Answer: D
[H+][OH−] = 10 − 4
[H+] =10 − 14 ÷ [OH+]
=10 −14 ÷ (1 × 10 − 3) = 10 − 11
pH = − log10[H+ ]
= − log10[10 − 11] = − 1 × −11
log10[10 − 11] = 1
= − 1 × 11 × 1
= − 11
According to the kinetic theory an absence in temperature causes the kinetic energy of particles to
A. decrease
B. increase
C. remain constant
D. be zero
Answer: C
