Three liquids X, Y and Z containing only hydrogen and carbon were burnt on a spoon. X and Y burnt with sooty flames while Z did not. Y is able to discharge the colour of bromine water whereas X and Z cannot. Which of the liquids would be aromatic in nature?
- A. X and Z
- B. Y
- C. X
- D. Z
The gas responsible for most of the fatal explosions in coal mines is
- A. butane
- B. ethene
- C. ethane
- D. methane
The alkaline hydrolysis of fats and oils produces soap and
- A. propane 1, 1, 3 - triol
- B. propane - 1,2,3 - triol
- C. propane - 1,3,3 - triol
- D. propane - 1, 2, 2 - triol
The bond which joins two ethanoic acid molecules in the liquid state is
- A. a covalent bond
- B. an ionic bond
- C. a dative covalent bond
- D. a hydrogen bond
The reaction between ethanoic acid and sodium hydroxide is an example of
- A. esterification
- B. neutralization
- C. hydroxylation
- D. hydrolysis
Vulcanization of rubber is a process by which
- A. isoprene units are joined to produce rubber
- B. rubber latex is coagulated
- C. sulphur is chemically combined in the rubber
- D. water is removed from the rubber
When excess chlorine is mixed with ethene at room temperature, the product is
- A. 1,2 - dichloroethane
- B. 1,2 - dichloroethene
- C. 1,1 - dichloroethane
- D. 1, 1 - dichloroethene
Which of the following is NOT involved in the extraction of metals from their ores?
- A. reduction with carbon
- B. reduction with other metals
- C. reduction by electrolysis
- D. oxidation with oxidizing agents
Mortar is NOT used for under-water construction because
- A. it hardens by lose of water
- B. its hardening doe not depend upon evaporation
- C. it requires concrete to harden
- D. it will be washed away by the flow of water
A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is
- A. copper
- B. aluminium
- C. zinc
- D. sodium
The scale of a chemical balance is made of iron plate and coated with copper electrolytically because
- A. iron is less susceptible to corrosion than copper
- B. copper is twice as less susceptitible to corrosion as iron
- C. copper is less susceptible to corrosion than iron
- D. copper and iron are equally susceptible to corrosion
The products of the thermal decomposition of ammonium trioxonitrate (V) are
- A. NO 2 and oxygen
- B. NH3 and oxygen
- C. nitrogen and water
- D. N2O and water
Bleaching powder, CaOCI2, H2O, deteriorates on exposure to air because
- A. it loses its water of crystallization
- B. atmospheric nitrogen displaces chlorine from it
- C. carbon (IV) oxide of the atmosphere displaceschlorine from it
- D. bleaching agents should be stored in solution
Which of the following reactions is (are) feasible?
I Br (1) + 2CI 2(aq) 2Br (aq) + CI 2(g)
ll 21 (aq) + Br 2(1) 2Br (aq) + 1 2(s)
lll 2F (aq) + CI 2(g) 2CI (aq) + F 2(g) IV 2F (aq) + Br 2(1) 2Br (aq) + F 2(g)
- A. l
- B. ll
- C. l and lll
- D. lll and lV
Gunpower is made from charcoal, sulphur and potassium trioxonitrate (V) The salt in the mixture performs the function of
- A. an oxidant
- B. a reductant
- C. a solvent
- D. a catalyst
Some products of destructive distillation of coal are?
- A. carbon (IV) oxide and ethanoic acid
- B. trioxocarbonate (IV) acid and methanoic acid
- C. producer gas and water gas
- D. coke and ammoniacal liquor
The catalyst used in the contact process for the manufacture of tetraoxosulphate (VI) acid is
- A. manganes (IV) oxide
- B. manganese (ll) tetraoxosulphate (VI)
- C. vanadium (V) oxide
- D. iron metal
Which of the following represents the balanced equation for the reaction of copper with concentrated trioxonitrate (V) acid?
- A. Cu (s) + 2HNO 3(aq) → Cu (NO 3) 2(aq) + H 2(g)
- B. Cu (s) + 4HNO 3(aq) → Cu (NO 3) 2(aq) + 2H 2O (1) + 2NO 2(g)
- C. 3Cu (s) + 8HNO3(aq) → 3Cu (NO3)2(aq) + 4H2O(1) + 2NO(g)
- D. 3Cu(s) + 4HNO3(aq) → 3Cu(NO 3) 2(aq) + 2H 2O (1) + 2NO (g)
The combustion of ethene, C 2H 4, is given by the equation C 2H 4 + 30 2 → 2CO2 + 2H2 O; ∆H = – 1428 KJ. If the molar heats of formation of water and carbon (IV) oxide are – 286 kJ and – 396 kJ respectively, calculate the molar heat of formation of ethene in KJ
- A. - 2792
- B. + 2792
- C. - 64
- D. + 64
An element, Z froms an anion whose formula is [Z(CN)6]y. If Z has an oxidation number of +2, what is the value of y?
- A. - 2
- B. - 3
- C. - 4
- D. - 5
What is discharged at the cathode during the electrolysis of copper (ll) tetraoxosulphate (VI) solution?
- A. Cu 2+ only
- B. H + only
- C. Cu 2+ and H
- D. Cu 2+ and SO 2-