[uks] Chemistry 2005(mock) Paper2(e)

2005-MOCK EXAM.-CHEM 2

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There are 30 questions in Section A and 20 questions in Section B. Atomic numbers and relative atomic masses of elements can be obtained from the Periodic Table printed on page 1. Section A 1.

A compound formed from the element X and sulphur has the following electronic structure:

(Only electrons in the outermost shells are shown.) How many lone pair(s) is/are there in the compound? A. B. C. D. 2.

2 4 6 8

The hazard warning label shown below is found on a compressed gas cylinder.

Which of the following gases may be contained in the cylinder? A. B. C. D.

Ethane Sulphur dioxide Oxygen Argon

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3.

Which of the following will NOT conduct an electric current? A. B. C. D.

4.

Which of the following statements about chlorine and bromine is incorrect? A. B. C. D.

5.

O2– F– Na+ Mg2+

The formula of hydrated iron(II) sulphate is FeSO4．xH2O. When 20.1g of the sulphate is heated strongly, 9.1g of water is formed. What is the value of x? A. B. C. D.

7.

They exist as diatomic molecules. Their atoms have the same number of outermost electrons. They form ions with a unit of negative charge. Bromine is the stronger oxidizing agent than chlorine.

Which of the following has the same number of protons as hydroxide ions (OH–)? A. B. C. D.

6.

Nickel Lead(II) chloride granules Molten sodium chloride Aqueous potassium iodide solution

5 6 7 8

Which of the following may form white precipitate with sodium hydroxide solution? A. B. C. D.

Lead(II) nitrate solution Iron(III) nitrate solution Copper(II) nitrate solution Potassium nitrate solution

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8.

Which of the following flame colours observed is WRONGLY matched? A. B. C. D.

9.

Metal Calcium Iron Sodium Potassium

Flame colour Brick-red Very bright light Golden yellow Lilac

Which of the following is the electron diagram of potassium oxide? (Only the outermost shell electrons are shown.) A.

B.

C.

D.

10. The following are some physical properties of a substance X : Melting point : 87℃ Boiling point : 225℃ Solubility in water : soluble Which of the following can be used to obtain X from its aqueous solution? A. B. C. D.

Decantation Filtration Crystallization Paper chromatography

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11. The structure of a compound formed between an element X and bromine is shown below :

What is the formula of the compound formed between X and magnesium? A. B. C. D.

MgX MgX2 Mg2X3 Mg3X2

12. Which of the following iron nails will rust first? A.

B.

zinc strip

C.

magnesium strip

D.

copper strip

13. An accident happens in a factory and some nitric acids are split. Which of the following substances, when added in excess, can neutralize the acid without leaving an alkaline solution? (1) (2) (3)

Ammonia solution Calcium carbonate Sodium chloride

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

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14. Which of the following changes is NOT a redox reaction? Fe2(SO4)3 + H2S → 2FeSO4 + S + H2SO4 2Al + 6HCl → 2AlCl3 + 3H2 CaCO3 + CO2 + H2O → Ca(HCO3)2 2KClO 3 → 2KCl + 3O2

A. B. C. D.

15. The reaction between calcium carbonate and dilute hydrochloric acid can be represented by the following equation: CaCO3(x) + 2HCl(aq) Ž CaCl2(y) + H2O(z) + CO2(g) Which of the following combinations is correct? x aq aq s s

A. B. C. D.

y s aq s aq

z aq l aq l

16. A piece of filter paper moistened with sodium chloride solution is put between the two metals in each case. metal M

metal M

metal M

– V

V

+

V

–

metal X

metal W voltage = 1.0 V

metal M –

+

metal Z

metal Y

voltage = 1.0 V

V

+

voltage = 0.5 V

voltage = 0.5 V

Which of the following represents the order of tendency to form ions of the metals? A. B. C. D.

W>Y>M> Z> X X>M>W>Z>Y X>Z>M>Y>W Y>X>Z>M>W

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17. Balance the following ionic equation: wAl + xCu2+ Ž yAl3+

+ zCu

The total charge on each side of the balances equation is A. B. C. D.

+2 +3 +5 +6

18. Consider the half equation: IO3−(aq) + xH2O(l) + ye− ?

I −(aq) + zOH−(aq)

Which of the following combinations is correct? A. B. C. D.

x 1 2 3 4

y 2 4 6 8

z 2 4 6 8

19. The bleaching actions of chlorine water and aqueous sulphur dioxide are compared as show below:

(1) (2) (3)

Sulphur dioxide Bleaches by reduction . Bleaching action is slower and milder. Bleaching effect is not permanent and original colour will be restored later.

Chlorine water Bleaches by oxidation. Bleaching action is faster and more vigorous. Bleaching effect can last for a longer period of time.

Which of the above combinations is correct? A. B. C. D.

(1) and (2) only. (2) and (3) only. (1) and (3) only (1), (2) and (3)

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20. When an alkane of formula C14H30 is cracked, which of the following is/are possible products. (1) (2) (3)

C4H10 and C10H20 C6H11 and C8H19 C7H14 and C7H16

A. B. C. D.

(1) and (2) only (2) and (3) only (1) and (3) only (1), (2) and (3)

21. Which of the following can reduce the formation of acid rain? (1) Installing catalytic converter in cars. (2) Using unleaded petrol. (3) Using diesel with low sulphur content. A. (1) and (2) only B. (1) and (3) only C. (2) and (3) only D. (1), (2) and (3) 22. The equation below represents the reaction of chlorine with potassium hydroxide solution: Cl2(g) + 2KOH(aq) ? KCl(aq) + KClO(aq) + H2O(l) Which of the following statements concerning this reaction is/are correct? (1) (2) (3) A. B. C. D.

Chlorine acts as an oxidising agent. Chlorine acts as a reducing agent. The oxidation number of oxygen changes from −2 to −1.

(1) only. (2) only. (1) and (2) only. (2) and (3) only.

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23. Sulphur dioxide can be prepared by (1) (2) (3)

the action of dilute hydrochloric acid on sodium sulphite. heating copper turning with concentrated sulphuric acid. burning iron pyrite (FeS2) in air.

A. B. C. D.

(1) and (2)only. (1) and (3) only. (2) and (3) only. (1), (2) and (3) only.

24. X is a compound with 4 carbon atoms. X gives negative results on the following tests : (1) Putting X into a solution of sodium hydrogencarbonate. (2) Putting X into bromine in 1,1,1–trichloroethane. (3) Heating X with acidified potassium dichromate solution. The structural formula of X may be A. B. C. D.

CH3CH2CH=CH2 CH3CH2CH2CH2OH CH3CH2CH2CO2H CH3CO2CH2CH3

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25. An organic compound has the following structure:

H

Br

CH3

C

C

OH

CH3 Br

The systematic name of this compound is A. B. C. D.

1,2-dibromo-1,2-dimethylethan-2-ol 1,2-dibromo-1,2-dimethylethan-4-ol. 2,3-dibromobutan-2-ol. 2,3-dibromobutan-4-ol.

26. Which of the following statements concerning thermoplastics articles is/are correct? (1) (2) (3)

They deform upon heating. They are commonly moulded by compression moulding. They must be addition polymers.

A. B. C. D.

(1) only (2) only (1) and (3) only (2) and (3) only

27. Which of the following methods can be used to solve pollution problems caused by plastic wastes? (1) (2) (3)

Recycling and reusing plastics Making biodegradable plastics Incinerating plastic in incinerators with high chimneys.

A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

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Directions:

Each question below (Question Nos. 28 to 30) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one opinion from A to D according to the following table:

A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement. B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement. C. The 1st statement is false but 2nd statement is true. D. Both statements are false. 1st statement

2nd statement

28.

Methanoic acid is an electrolyte.

It conducts electricity in aqueous solution.

29.

Ethene can decolourize an acidified potassium permanganate solution.

Ethene contains a carbon-carbon double bond.

30.

Concentrated sulphuric chars cane sugar.

Concentrated sulphuric acid is highly corrosive.

2005-MOCK EXAM.-CHEM 2

acid

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Section B 31. P, Q, and R are three metals. Heating with the presence of carbon will remove oxygen from the oxides of P and Q but not from the oxide of R. Q will remove oxygen from the oxide of P. On this evidence only, arrange these metals in the descending order of their reactivity. A. B. C. D.

P, Q, R R, P, Q P, R, Q R, Q, P

32. Equal masses of zinc powder and iron powder (having similar particle size) are separately treated with an excess of 1 M hydrochloric acid at the following is a correct description of what might occur?

A. B. C. D.

Total volume of hydrogen evolved

Initial rate of reaction

smaller with zinc smaller with zinc greater with zinc greater with zinc

faster with zinc faster with iron faster with zinc faster with iron

33. Which of the following statements concerning the role of water in electrolysis is/are correct? (1) (2) (3)

Water acts as a solvent to dissolve electrolytes. Water may be chemically changed during electrolysis. Water ionizes slightly to give equal numbers of H +(aq) and OH−(aq).

A. B. C. D.

(1) and (2)only (2) and (3) only (1) and (3) only (1), (2) and (3)

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34. Chlorine can be prepared from concentrated hydrochloric acid and potassium permanganate according to the following equation: 2KMnO 4

+ xHCl ?

2KCl + 2MnCl2 + yH2O + zCl2

What is the value of z? A. B. C. D.

4 5 8 10

35. Ammonia was once used to detect the leakage of chlorine in chemical plants. If there was a leakage, white fumes would be observed. The word equation below represents the reaction of chlorine with ammonia: chlorine + ammonia à ammonium chloride + nitrogen What the white fumes might have been? A. B. C. D.

Chlorine Ammonia Ammonium chloride Nitrogen

36. The sulphuric acid obtained by this industrial process contains 98% by mass of sulphuric acid and has a density of 1.84 g cm−3. Calculate the volume of the acid required for dilution to 500 cm3 of 0.10 M sulphuric acid. A. B. C. D.

5.44 cm3 54.40 cm3 27.20 cm3 2.72 cm 3

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37. Which of the following gases occupies the largest volume at room temperature and pressure? (molar volume of gas at room temperature and pressure = 24.0 dm3) A. B. C. D.

1.0 g of ammonia. 2.0 g of nitrogen. 3.0 g of oxygen. 4.0 g of carbon dioxide.

38. Consider the set-up shown below:

Which of the following statements are correct? (1) (2) (3)

The solution around electrode X turns brown. The mass of electrode X remains unchanged. Reduction occurs at electrode Y.

A. B. C. D.

(1) and (2) only (1) and (3) only (2) and (3) only (1), (2) and (3)

39. Which of the following colour changes for the indicated reactions in INCORRECT? A. B. C. D.

Solution through which SO2 is bubbled I2(aq) Fe2(SO4)3(aq) K2Cr2O7(aq) + H2SO4(aq) KMnO4(aq) + H2SO4(aq)

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Colour change brown Ž purple yellow Ž green orange Ž green purple Ž colourless Go on to the next page

40. The set-up shown above is best used to collect

A. B. C. D.

ammonia. chlorine. nitrogen. sulphur dioxide.

41. A conical flask containing hydrochloric acid is placed on a top-pan balance. Some marble chips are carefully added to the flask. Which of the following graphs represents the correct plot of the mass of the flask and its content against time?

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42.

In the above graph, curve X was obtained by the reaction between 100 cm3 of 1 M HCl and excess zinc granules. Which of the following changes would produce curve Y? A. B. C. D.

increasing the temperature by 10°C adding the same amount of zinc powder instead of zinc granules using 200 cm 3 of 0.8 M HCl instead of 100 cm3 of 1 M HCl using 50 cm3 of 1.5 M HCl instead of 100 cm 3 of 1 M HCl

43.

In the above experiment, which of the following major products will be liberated at the electrodes? A. B. C. D.

Cathode Magnesium Magnesium Hydrogen Hydrogen

2005-MOCK EXAM.-CHEM 2

Anode Oxygen Bromine Bromine Oxygen -16-

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44.

Which of the following statements concerning the above experiment is/are correct? (1) (2) (3)

Platinum electrodes should be used. The concentration of Na+(aq) ions around the cathode increase. The solution changes from colorless to pink.

A. B. C. D.

(1) only. (2) only. (1) and (3) only (2) and (3) only

45. Which of the following does not belong to same homologous series? A.

B. O

O H3 C

C

CH 3CH2 C O

CH2CH3

C.

O

H

D. O H

O

C

CH 3

O

CH3

2005-MOCK EXAM.-CHEM 2

C O

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CH3

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46. Which one of the following is condensation polymer? A.

CH3 H

CH3 H

CH3 H

C

C

C

C

H

CO2H H

C

C

CO2H H

CO2H

B. O H

H

C N CH 2CH2 N

O

O H

H

O

C CH2

C N CH2 CH 2 N

C

CN

CN

CN

CN

CN

C

C

C

C

C

O H CH2

C N

C. H

D.

CH2

H

CH 2

H

CH 2

H

CH 2

F

F

F

F

F

F

C

C

C

C

C

C

F

F

F

F

F

F

H

47. Soapless detergent is used to overcome the disadvantages of soap. Which of the following is/are the disadvantage(s) of soap? (1) (2) (3)

Soap forms scum with lake water. Oils used as starting materials in the preparation of soaps can also be used for food. Soap cannot be used in strongly acidic solutions.

A. B. C. D.

(2) only. (1) and (2) only. (2) and (3) only (1), (2) and (3)

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Directions:

Each question below (Question Nos. 48 to 50) consists of two separate statements. Decide whether each of the two statements is true or false; if both are true, then decide whether or not the second statement is a correct explanation of the first statement. Then select one opinion from A to D according to the following table:

A. Both statements are true and the 2nd statement is a correct explanation of the 1st statement. B. Both statements are true but the 2nd statement is NOT a correct explanation of the 1st statement. C. The 1st statement is false but 2nd statement is true. D. Both statements are false. 1st statement

2nd statement

48.

Methyl orange is used instead of phenolphthalein as an indicator for the titration of ethanoic acid and sodium hydroxide.

The colour change of methyl orange is from yellow in acidic medium to red in alkaline medium.

49.

During the electrolysis of copper(II) sulphate using carbon electrodes, hydrogen is always liberated at the cathode.

Hydrogen ion is a stronger oxidizing agent than copper(II) ion.

50.

Soap powder usually contains washing soda, a hydrated form of sodium carbonate, which can help reduce the hardness of water.

Sodium carbonate removes calcium and magnesium ions by forming insoluble calcium carbonate and magnesium carbonate

END OF PAPER

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