Hardening of an oil may be achieved by?
- A. boiling the oil with water
- B. boiling the oil with a catalyst
- C. treating the oil with sodium hydroxide
- D. treating the oil with hydrogen and catalyst
- E. distilling oil under reduced pressure
Which of the following does NOT happen when a zinc rod is introduced into a solution of copper (ll) sulphate?
- A. Electrons flow towards the zinc rod
- B. The zinc rod dissolves
- C. The temperature of the soil changes
- D. The blue colour of the solution gradually disappears
- E. Copper metal is deposited
The chemical reaction which takes place at the anode (positive electrode) in electrolysis is?
- A. oxidation
- B. hydrolysis
- C. dissociation
- D. reduction
- E. disproportionation
Which of the following silver halides is readily soluble in ammonium hydroxide?
- A. Agl
- B. AgBr
- C. AgCl
- D. AgF
- E. None of the above
In which of the following is the oxidation state of oxygen different from its value in water?
- A. OH-
- B. H3O+
- C. O-
- D. H2O2
- E. SO2
When dilute hydrochloric acid is added to iron(ll)sulphide, the gas evolved will?
- A. turn moist red litmus paper blue
- B. turn lime water milky
- C. blacken lead acetate paper
- D. rekindle a glowing splint
- E. burn a sqeakly pop
Given the mean atomic mass of chlorine prepared in the laboratory to be 35.5 and assuming that chlorine contains two isotopes of mass number 35 nad 37, what is the percentage composition of the isotope of mass number 35?
- A. 20
- B. 25
- C. 50
- D. 75
- E. 90
Which of the following is acceptable as the organic product of the reaction of ethanoic acid and ethanol with an acid catalyst?
- A. Ethyl ethanoate
- B. Methyl ethanoate
- C. Ethyl methyl ketone
- D. Butanol
- E. None
20 cm3 of 1 M H\(_2\)SO\(_4\) is mixed 20 cm\(^3\) of 1 M NaOH. The resulting solution is?
- A. acidic with a molarity of 0.50 M H2SO4
- B. acidic with a molarity of 0.25 H2SO4
- C. neutral
- D. alkaline with a molarity of 0.25 M NaOH
- E. alkaline with a molarity of 0.50 M NaOH
When ethene gas reacts with chlorine gas to form 1, 2-dichloroethene, the reaction is called?
- A. substitution
- B. addition
- C. polymerization
- D. hydrolysis
- E. reduction
Which ONE of the following statements is true?
- A. All alkali metals salts dissolves with dissociation in water
- B. Most ionic substances are easily vaporized
- C. Ionic substances exist only as liquid
- D. Non-ionic substances are good electrolytes
- E. Nitrogen exists in a trivalent state in ammonium salts
Element X has a total of 19 electrons and can react with oxygen to form an oxide. Which of the following statements is NOT true of the oxide of the element?
- A. When exposed to air, it slowy changes to liquid
- B. its solution in water conducts electricity
- C. Its solution in water, on evaporationm gives a white solid
- D. Its solution in water liberates hydroge when in contact with aluminium metal
- E. Its oxide, when stronlgy heated, regenerates the elements X
Chlorine, bromine and iodine resemble each other in that all?
- A. dissolve in alkalis
- B. react violently with hydrogen without heating
- C. displace each other from solutions of their salts
- D. are gases
- E. are liquids
The boiling point of water is higher than that of methanol because?
- A. water is oxide while methanol is an alcohol
- B. inter molecular forces in water are stronger than those in methanol
- C. water is an inorganic compound while methanol is organic
- D. water is an ionic compound while methanol is a covalent compound
- E. water is more reactive than methanol
Which of the following statements is true?
- A. Metals conduct electricity while non-metals do not
- B. Metals have high density, non-metals have low density
- C. Metals form basic oxides, non-metals form acidic oxides
- D. In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
- E. Metals lose elections while non-metals gain electron during chemical reactions
Which of the following statements is an exception in the assumptions of the kinetic theory of gases?
- A. Gases are composed of many elastic particles
- B. The particles are of negligible size
- C. The particles are in constant random motion
- D. The particles are of negligible mass
- E. The particles collide with each other
How many grams of hydrogen gas will be liberated when 6g of magnesium ribbon dissolves in 500cm3 of 6M HCl?
(Mg=24, H=1, Cl=35.5)
- A. 1.2 g
- B. 0.7 g
- C. 0.5 g
- D. 0.3 g
- E. 0.12 g
Under high pressure, real gases do not obey gas laws because their molecules?
- A. have become more energetic
- B. have become less energetic
- C. have become smaller in size
- D. decompose into atoms
- E. start repelling each other
Which of the following reactions is correct as as written?
- A. FeCl2 + 3NH4OH → Fe(OH)3 + 3NH4Cl
- B. Pb2O3 + 4HCl → PbCl2 + 2H2O
- C. PbNO3 + H2S → PbS + 2HNO3
- D. NaOH + H2SO4 → NaHSO4 +H2O
- E. 2NH4NO3 → N2 + 2H2O
If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?
- A. 2.2 M
- B. 1.1 M
- C. O.22 M
- D. 0. 11 M
- E. 0.20 M
On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 11/2 litres of an oxide, What is the formula of the oxide.
- A. XO3
- B. X2O3
- C. X3O2
- D. XO2
- E. None of the above