AS REVISION 1 9701 A-LEVEL

1. The petrol additive tetraethyl-lead(IV), Pb(C2H5)4, is now banned in many countries. When it is completely burned in air, lead(II) oxide, CO2 and H2O are formed. How many moles of oxygen are required to burn one mole of Pb(C2H5)4?

A 9.5 B 11 C 13.5 D 27

2. Which compound has a boiling point that is influenced by hydrogen bonding?

A CH3CHO B CH3OCH3 C HCO2H D HCO2CH3

3. Which gas is likely to deviate most from ideal gas behaviour?

A HCl B He C CH4 D N2

4. During the electrolysis of brine using a diaphragm cell, which reaction occurs at the cathode?

A 2Cl – (aq) → Cl2(g) + 2e– B 4OH–(aq) → O2(g) + 2H2O(l) + 4e–

C 2H2O(l) + 2e– → H2(g) + 2OH–(aq) D Na+(aq) + e– → Na(s)

5. Chlorine dioxide is produced on a large scale as it is used for bleaching paper pulp. It is made by the following reaction.

2ClO (aq) + SO2(g) → 2C lO2 (g) + SO − 2 4 (aq)

How do the oxidation numbers of chlorine and sulphur change in this reaction?

A chlorine decreases by 1 ; sulphur increases by 1B chlorine decreases by 1 ; sulphur increases by 2C chlorine decreases by 3 ; sulphur increases by 1D chlorine decreases by 3 ; sulphur increases by 2

6.What is the number of isomers of C2H2Cl2 including cis-trans isomers?

A 2 B 3 C 4 D 5.

7. In the upper atmosphere chlorofluoroalkanes (CFCs) are broken down to give chlorine radicals but not fluorine radicals. What is the best explanation for this?

A Fluorine is more electronegative than chlorine.B Fluorine radicals are less stable than chlorine radicals.C The C– F bond is stronger than the C–Cl bond.D The chlorine atom is larger than the fluorine atom

8. An amine is produced in the following reaction.

C2H5I + 2NH3 → C2H5NH2 + NH4I

What is the mechanism?A electrophilic addition B electrophilic substitutionC nucleophilic addition D nucleophilic substitution

9. Which molecules are planar?

1 BCl3 2 NH3 3 PH3

10. What properties enable magnesium oxide to be used as a refractory lining in a furnace?

1 It has a high melting point.2 It has a low thermal conductivity.3 It does not react with basic slags.

11. N2O4 is a poisonous gas. It can be disposed of safely by reaction with sodium hydroxide.

N2O4(g) + 2NaOH(aq) → NaNO3(aq) + NaNO2(aq) + H2O(l)

What is the minimum volume of 0.5 mol dm–3 NaOH(aq) needed to dispose of 0.02 mol of N2O4?

A 8 cm3 B 12.5 cm3 C 40 cm3 D 80 cm3

12. A sample of chlorine containing isotopes of mass numbers 35 and 37 was analysed in a mass-spectrometer. How many peaks corresponding to Cl 2

+ were recorded?

A 2 B 3 C 4 D 5

13. Which of the following least resembles an ideal gas?

A ammonia B helium C hydrogen D trichloromethane

14. At a total pressure of 1.0 atm, dinitrogen tetraoxide is 50 % dissociated at a temperature of 60oC,according to the following equation.

N2O4 2NO2

What is the value of the equilibrium constant, Kp, for this reaction at 60oC?

A 1/3 atm B 2/3 atm C 4/3 atm D 2 atm

15. What happens when chlorine is bubbled through aqueous potassium iodide?

A Chlorine is oxidised to chloride ions. B Hydrochloric acid is formed.C Iodide ions are oxidised to iodine. D Potassium iodide is reduced to iodine

16. Warfarin is used as a rat poison.

How many chiral centres are present in the warfarin molecule?

A 0 B 1 C 2 D 3

17. The structures below show isomers of C6H12.

In which pair are the members cis-trans isomers of each other?

A 1 and 2 B 1 and 3 C 1 and 4 D 2 and 4

18. Which alcohol may be oxidised to a product which reacts with 2,4-dinitrophenylhydrazine reagent but not with Fehling’s reagent?

A butan-1-ol B butan-2-ol C 2-methylpropan-1-ol D 2-methylpropan-2-ol

19. Aldehydes and ketones are carbonyl compounds.Which of them react both with NaBH4 and with Tollens’ reagent?

A both aldehydes and ketones B aldehydes onlyC ketones only D neither aldehydes nor ketones.

20. Which compound is a product of the hydrolysis of CH3CO2C3H7 by boiling aqueous sodium hydroxide?

A CH3OH B C3H7OH C C3H7CO2H D C3H7 CO2− Na+

21. Hydrazine, N2H4, is widely used as a rocket fuel because it reacts with oxygen as shown,producing ‘environmentally friendly’ gases.

N2H4(l) + O2(g) → N2(g) + 2H2O(g) ΔH = –534 kJ mol–1

Despite its use as a rocket fuel, hydrazine does not spontaneously burn in oxygen.Why does hydrazine not burn spontaneously?

1 The activation energy is too high.2 The N≡N bond is very strong.3 Hydrazine is a liquid.

22. Ammonia and chlorine react in the gas phase.8NH3 + 3Cl2 → N2 + 6NH4Cl

Which statements are correct?

1 Ammonia behaves as a reducing agent.2 Ammonia behaves as a base.3 The oxidation number of the hydrogen changes

23. How can the rate of reaction between ethanal and aqueous hydrogen cyanide be increased?

1 by irradiation with ultraviolet light2 by a rise in temperature3 by the addition of a small quantity of aqueous sodium cyanide

24. Which statements about lactic acid, CH3CH(OH)CO2H, are correct?

1 Lactic acid forms optical isomers.2 Two hydrogen atoms per lactic acid molecule can be involved in hydrogen bonding.3 Lactic acid would form an aldehyde when oxidised by acidified potassium dichromate(VI).

25. Which diagram describes the formation of a π bond from the overlap of its orbitals?

26. For an ideal gas, the plot of pV against p is a straight line. For a real gas, such a plot shows a deviation from ideal behaviour. The plots of pV against p for three real gases are shown below.

The gases represented are ammonia, hydrogen and nitrogen.

27. Sulphur dioxide is an important food preservative.Which property makes sulphur dioxide useful in this role?

A It is a gas. B It is a reducing agent.C It reacts with oxygen to form sulphur trioxide. D It reacts with water to form an acidic solution

28. In which class of compound, in its general formula, is the ratio of hydrogen atoms to carbonatoms the highest?

A alcohols B aldehydes C carboxylic acids D halogenoalkanes

29. Which reaction is an example of nucleophilic substitution?

A CH3CH2Br → CH2=CH2 + HBrB CH2=CH2 + HBr → CH3CH2BrC C3H7Br + H2O → C3H7OH + HBrD C2H6 + Br2 → C2H5Br + HBr

30. Which compound

• is unaffected by hot alkaline potassium manganate(VII);• gives hydrogen when treated with sodium?

A (CH3)2CHCOCH3 B (CH3)3COH C CH3CH2CH(OH)CH3 D CH3CO2CH(CH3)2