If glucose is heated with concentration tetraoxosulphate (VI) acid, it will be dehydrated to
- A. carbon
- B. carbon (IV) oxide
- C. ethene
- D. ethanol
If the silver mirror test is positive, it indicates the presence of an
- A. alkyne
- B. alkanol
- C. alkanone
- D. alkanal
The type of isomerism shown by cis- and trans- isomers is
- A. optical isomerism
- B. positional isomerism
- C. functional isomerism
- D. geometrical isomerism
The most common ores of iron include
- A. haematite, malachite and limonite
- B. chalcocite, calamine and bornite
- C. magnetite, haematite and limonite
- D. magnetite, chalcocite and bornite
which of the following gives a precipitate when treated with NaOH solution?
- A. AlCl3
- B. NH4Cl
- C. Na2CO3
- D. CH3COONa
Leads is used for making bullets and lead shots because of its
- A. resistance to corrosion
- B. low melting point
- C. high density
- D. flexibility
When a solution of ammonium trioxocarbonate (IV) is added to a solution of an unknown salt, a white precipitate which is soluble in dilute hydrochloric acid but insoluble in ethanoic acid is formed. This indicates the presence of
- A. Ca2+
- B. Na+
- C. Zn2+
- D. K+
Which of the following compounds of trioxonitrate (V) will decompose to give dinitrogen (i) oxide and water when heated?
- A. NaNO3
- B. Zn(NO3)2
- C. Cu(NO3)2
- D. NH4NO3
The substance that is used in the steel industry for the removal of carbon, sulphur and phosphorus impurities from pig iron is
- A. oxygen
- B. chlorine
- C. nitrogen
- D. hydrogen
The rate of a reaction usually decreases with a decrease in the concentration of reactants because
- A. kinetic energy decrease
- B. temperature increase
- C. speed increases
- D. reactants collision decrease
A catalyst speeds up the rate of chemical reaction by
- A. taking part in the reaction
- B. increasing the activation energy of the reaction
- C. lowering the activation energy of the reaction
- D. increasing the heat content
Which of the following reaction is endothermic?
- A. C(s) + O2(g) → CO2(g)
- B. CaO(s) + H2O(l) → Ca(OH)2(s)
- C. C(s) + H2O(g) → CO(g) + H2(g)
- D. HCl(aq) + NaOH(aq) → NaCl(aq) + H2O(l)
\(NH_{3(g)} + HCl_{(g)} → NH_4Cl_{(s)}\)
The entropy change in the system above is
- A. positive
- B. zero
- C. negative
- D. indeterminate
If a given quantity of electricity liberates 0.65g of Zn2+, what amount of Hg2+ would be liberated by the same quantity of current?
[Zn = 65, Hg = 201]
- A. 1.00g
- B. 2.01g
- C. 4.02g
- D. 8.04g
In recharging a lead-acid accumulator, the reaction at the cathode can be represented as
- A. Pb2+(aq) + SO2-4(aq) →PbSO4(s)
- B. Pb2+(aq) + 2e- →Pb(s)
- C. Pb2+(aq) + 2H2O(l) → PbO2(s) + 4H+(aq) + 4e-
- D. Pb(s) → Pb2+(aq) + 2e-
What is the IUPAC nomenclature of the compound NaCIO?
- A. sodium oxochlorate (I)
- B. sodium chloro (I) oxide
- C. sodium monooxochlorate (II)
- D. sodium chloro (I) monoxide
Insoluble salts can be prepared by?
- A. titrating an alkali against an appropriate acid
- B. reacting an acid with trioxocarbonate (IV) salt
- C. directing combination of the elements which make up the salt
- D. mixing two soluble compounds containing the metallic radical and the acidic radical
0.05 mol dm-3 HCl is neutralized by 25 cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base
- A. 0.016 mol dm-3
- B. 0.032 mol dm-3
- C. 0.039 mol dm-3
- D. 0.064 mol dm-3
What is the pH of 0.001 mol dm-3 solution of sodium hydroxide
- A. 14
- B. 13
- C. 12
- D. 11