Three solutions contain carbonate, sulphate and sulphide ions respectively. One test that will identify just ONE of them completely is by addition to each of them of
- A. barium chloride solution
- B. dilute hydrochloric acide
- C. lead nitrate solution
- D. calcium chloride solution
- E. sodium hydroxide solution
If excess zinc is added to a bluish green solution of copper (II) sulphate, and the excess zinc filtered off after completion of reaction, a colourless solution is obtained because
- A. both zinc and copper are metals
- B. the sulphate radical and the zinc ion are divalent
- C. zinc is more electropositive than copper
- D. both zinc and copper form depositive ions in solution
- E. zinc is a reducing agent
Consider the following exothermic reaction
2SO2(g) + O2(g) ↔ 2SO3(g)
If the temperature of the reaction is reduced from 800°C to 500°C, an no other change takes place, then
- A. the reaction rate increases
- B. concentration of SO3 decreases
- C. concentration of SO3 increases
- D. SO2 gas becomes unreactive
- E. O3 gas becomes unreactive
The most common type of chemical reaction which alkanes undergo is
- A. substitution
- B. addition
- C. condensation
- D. polymerisation
- E. double decomposition
Which of the following compounds will form a solution if exposed to air?
- A. Na2CO3.10H2O
- B. NaNO3
- C. CuSO4
- D. CaCl2
- E. Na2SO4.10H2O
The normal boiling point of a liquid is defined as?
- A. the temperature at which its vapour pressure equals the atmospheric pressure
- B. the temperature at which bubbles begin to form
- C. the temperature at which the vapour pressure equals 1 temperature
- D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid
- E. the temperature at which the space above the liquid is saturated
Hypochlorous acid is used as a bleach because
- A. it is a strong acid
- B. it yields chlorine readily in pure water
- C. it is an oxidising agent
- D. it is a weak acid
- E. it is a reducing agent
The nucleus of an atom contains
- A. protons only
- B. neurons only
- C. protons and electrons
- D. neutrons and electrons
- E. protons and neutrons
An example of an alcohol is
- A. CCl4
- B. CH3COOH
- C. CHCl3
- D. C2H6
- E. CH3OH
When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called
- A. ionic bond
- B. electrovalent bond
- C. covalent bond
- D. co-ordinate bond
- E. hydrogen bond
Which of the following is not a member of the homologous series of the paraffins (alkanes)?
- A. C3H8
- B. C5H12
- C. C7H16
- D. C15H32
- E. C24H48
Which of the following reactions does not take place in the smelting of iron in a blast furnace?
- A. \(CaCO_{3(s)} → CaO_{(s)} + (CO_{2(g)}\)
- B. \(C_{(s)} + O_{2(g)} → CO_{2(g)}\)
- C. 3\(Fe{(s)} + 2O_{2(g)} → FeO_{4(s)}\)
- D. \(SiO_{2(s)} + CaO_{(s)} → CaSiO_{3(s)}\)
- E. \(CO_{2(g)} + C_{(s)} → 2CO_{(g)}\)
Which of the following gases may not be dried with concentrated sulphuric acid?
- A. HCl
- B. N2
- C. Cl2
- D. SO2
- E. NH3
Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?
- A. Tin
- B. Zinc
- C. Copper
- D. Lead
- E. Aluminium
If 30cm\(^3\) of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm\(^3\) of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively?
- A. 9.3 sec
- B. 14 sec
- C. 21 sec
- D. 28 sec
- E. 30.3 sec
The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;
- A. acetic acid and ethene
- B. methanoic acid and ethene
- C. methanoic acid and ethylene
- D. ethanol and ethene
- E. acetic acid and ethylene
The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as;
- A. saponification
- B. dehydration
- C. esterification
- D. hydrolysis
- E. hydration
During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,
- A. the litmus turns blue but no gas is evolved
- B. the litmus turns blue and oxygen is evolved
- C. the litmus turns blue and hydrogen is evolved
- D. the litmus turns red and oxygen is evolved
- E. the litmus turns red and then becomes colourless
A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by
- A. boiling the water
- B. adding excess calcium hydroxide
- C. adding a calculated amount of calcium hydroxide
- D. adding sodium carbonate
- E. adding magnesium hydroxide
Which of the following metals cannot replace hydrogen from water or steam?
- A. Sodium
- B. Magnesium
- C. Iron
- D. Calcium
- E. Copper
When each of the nitrates of Potassium, Magnesium and iron is heated,
- A. all the nitrates decompose to their oxides
- B. the nitrate of magnesium gives the nitrite and oxygen
- C. the nitrates of magnesium and iron give the oxides
- D. the nitrate of iron gives the nitrite and oxygen
- E. the nitrate of the magnesium is not decomposed