When a crystal was added to the clear solution of its salt, the crystal did not dissolve and the solution remained unchange. This showed that the solution was
- A. supersaturated
- B. concentrated
- C. unsaturated
- D. saturated
Water has the ability to dissolve almost all substance because its molecules has a structure with
- A. one positive end and one neutral end
- B. one positive end and one negative end
- C. two negative ends
- D. two positive ends
Which of the following results in the fall of acid rain?
- A. Oxides of lead
- B. Particulate matter
- C. Oxides of sulphur
- D. Gaseous hydrocarbon
When 50cm2 of a saturated solution of sugar of molar mass 342 g at 40oC was evaporated to dryness, 34.2g of dry solid was obtained. The solubility of sugar at 40oC is
- A. 2.0 mol dm-3
- B. 3.5 mol dm-3
- C. 7.0 mol dm-3
- D. 10.0 mol dm-3
The products of the combustion of candle wax are?
- A. hydrogen and water
- B. oxygen and water
- C. carbon (IV) oxide and water
- D. carbon (II) oxide and water
An emulsion may be produced by shaking a detergent solution with
- A. palm wine
- B. ethanoic acid
- C. palm oil
- D. water
One mole of a hydrocarbon contains 36g of carbon and its vapour density is 20. The structure of the hydrocarbon is
- A. CH3C ≡ CH
- B. CH3CH = CH2
- C. CH3CH2C ≡ CH
- D. CH3CH2 CH3
CH3 – CH2 – C≡CH
The hybridization in the compound above is
- A. Sp2
- B. sp
- C. sp3 and sp2
- D. sp3 and sp
Which of the following has an isomer?
- A. C6H6
- B. C2H6
- C. C4H10
- D. C2H4
An example of aliphatic unsaturated hydrocarbon is
- A. pentane
- B. butanol
- C. propene
- D. benzene
Nigerian crude oil is described as light crude because of its
- A. low sulphur content
- B. high natural gas content
- C. high octane number
- D. low aliphatic-hydrocarbon content
The gas obtained as a product of anaerobic action on organic matter buried in the earth is?
- A. ethene
- B. methane
- C. carbon (IV) oxide
- D. nitrogen (IV) oxide
Which of the following typically represents a photochemical reaction?
- A. Formation of water from hydrogen and oxygen molecules
- B. Conversion of dinitrogen (IV) oxide to nitrogen (IV) oxide
- C. Decomposition of calcium hydroxide to its oxide
- D. Conversion of silver halides to grey metallic silver
The sulphide which is insoluble in dilute hydrochloric acid is
- A. FeS
- B. CuS
- C. ZnS
- D. Na2S
In the industrial production of H2 from natural gas the CO2 produced along with the H2 is removed by
- A. washing under pressure
- B. drying over phosphorus (V) oxide
- C. passing the mixture into lime water
- D. using ammonical copper (I) chloride
The characteristic colour of the flame shown when a copper sail moistened with concentrated hydrochloric acid on a platinum wire is put on bunsen burner is
- A. lilac
- B. green
- C. yellow
- D. brick-red
Which of the following pairs of substance will react further with oxygen to form a higher oxide?
- A. CO2 and H2O
- B. NO and H2O
- C. CO and CO2
- D. SO2 and NO
The ion that will give a white precipitate with aqueous NaOH and soluble in excess of the base is
- A. Ca2+
- B. Mg2+
- C. Zn2+
- D. Cu2+
Dynamic equilibrium describes a situation where
- A. a reaction gives back the reactant
- B. te concentration of the reactant and products is equal
- C. both forward and and reverse reactions proceed at the same rate
- D. reactants are converted to products
The efficiency of a solid catalyst to increase reaction rates depends on its
- A. surface area
- B. solubility
- C. concentration
- D. quantity
Carbon exist naturally in the combined state as?
- A. graphite
- B. coal
- C. diamond
- D. wood