An element, X, forms a volatile hydride XH3 with a vapour density of 17.0. The relative atomic mass of X is?
(H = 1)
- A. 34.0
- B. 31.0
- C. 20.0
- D. 14.0
2.85g of an oxide of copper gave 2.52g of copper on reduction and 1.90g of another oxide gave 1.52g of copper on reduction. The data above illustrates the law of?
- A. constant composition
- B. conservation of mass
- C. reciprocal proportions
- D. multiple proportions
35 cm3 of hydrogen was sparked with 12 cm3 of oxygen at 110°C and 760mm Hg to produce steam. What percentage of the total volume of gas left after the reaction is hydrogen?
- A. 11%
- B. 31%
- C. 35%
- D. 69%
The relatively high boiling points of alkanols are due to?
- A. ionic bonding
- B. aromatic character
- C. covalent bonding
- D. hydrogen bonding
An example of a secondary amine is?
- A. propylene
- B. di-butylamine
- C. methylamine
- D. trimethylamine
CxHY + 4O2 → 3CO2 + 2H2O. The hydrocarbon, CxHY, in the reaction above is?
- A. propane
- B. propene
- C. propyne
- D. propanone
The role of sodium chloride in the preparation of soap is to?
- A. purify the soap
- B. separate the soap from glycerol
- C. accelerate the decomposition of the fat or oil
- D. react with glycerol
Aromatic and aliphatic hydrocarbons can be distinguished from each other by the?
- A. action of bromine
- B. use of polymerization reaction
- C. action of heat
- D. use of oxidation reaction
Which of the following pairs has compounds that are isomers?
- A. Propanal and propanone
- B. Ethanoic acid and ethylmethanoate
- C. Ethanoic acid and ethane-1, 2-diol
- D. 2-methylbutane and 2, 2-dimethylbutane
CHCl3 + Cl2 → HCl + CCl4. The reaction above is an example of?
- A. an addition reaction
- B. a substitution reaction
- C. a chlorination reaction
- D. a condensation reaction
Group 1 A metals are not found free in nature because they?
- A. are of low melting and boiling points
- B. have weak metallic bonding
- C. conduct electricity and heat
- D. are very reactive
Which of the following compounds will impart a brick-red colour to a non-luminious bunsen flame?
- A. NaCl
- B. LiCl
- C. CaCl2
- D. MgCl2
In the extraction of iron in the blast furnace, limestone is used to?
- A. release CO2 for the reaction
- B. reduce the iron ore
- C. increase the strenght of the iron
- D. remove impurities
Which of the following ions will give a white precipitate with aqueous NaOH and soluble in excess of the base?
- A. Ca2+
- B. Mg2+
- C. Zn2+
- D. Cu2+
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
- A. sulphur (lV) oxide
- B. hydrogen sulphide
- C. sulphide (lV) oxide
- D. hydrogen chloride
A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?
- A. sulphur (ii) oxide
- B. hydrogen sulphide
- C. sulphide (lV) oxide
- D. hydrogen chloride
Sulphur exists in six forms in the solid state. This property is known as?
- A. isomerism
- B. allotropy
- C. isotopy
- D. isomorphism
In the industrial production of hydrogen from natural gas, carbon (IV) oxide produced along with the hydrogen is removed by?
- A. washing with water under pressure
- B. passing the mixture into lime water
- C. using ammoniacal copper (l) chloride
- D. drying over phoshorus (V) oxide
Which of the following equilibria is shifted to the right as a result of an increase in pressure?
- A. H2(g) + I2(g) 2HI(g)
- B. 2NO2(g) N2O4(g)
- C. PCl5(s) PCl3(s) + Cl2(g)
- D. 2O3(g) 3O2(g)
Which of the following processes leads to increase in entropy?
- A. Mixing a sample of NaCl and sand
- B. Condensation of water vapour
- C. Boiling a sample of water
- D. Cooling a saturated solution
If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?
- A. low temperatures
- B. high temperatures
- C. all temperatures
- D. all pressures