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Section A

Answer all the questions in this section in the spaces provided.

The total mark for this section is 45.

A 1

[Total: 5]

A 2

1

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[Total: 8]

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A 3

[Total: 5]

A 4

!

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[Total: "]

A 5

4

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5

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A 6 (a)Acidi#ed potassium dichromate $%&' is a powerful o(idi)in* a*ent. +(plain

with test o,servation and reaction that how it can ,e used to test the presence of a

reducin* a*ent.

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(b)/hen ma*nesium metal is added to an aqueous solution of iron $&&&' sulphate0 a

redo( reaction takes place. ra2 cr2stal of iron and colourless solution are formed.

(i)/rite the ionic equation0 includin* state s2m,ols0 for the redo( reaction.

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(ii)3educe which is the o(idi)in* a*ent in this reaction +(plain 2our answer in

terms of chan*e in o(idation states.

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(c) alculate the o(idation states of the underlined atoms from the followin*

rea*ents:

67n4 9l"

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[1]

(d) 3e#ne o(idation and reduction with suita,le e(ample in terms of electron

transfer.

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(e) /hat happens when concentrated h2drochloric acid reacts with man*anese $&%'

o(ide on heatin* ive with reaction. /hich reactant has ,een reduced +(plain

2our answer.

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8

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[Total: ;]

B7 (a) alculate the mass of o(2*en *as in a room which measures 4 m hi*h0 8m

wide and 1< m lon*. Assume that air contains 1

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(b)The followin* equation represents the reaction ,etween sodium car,onate and

h2drochloric acid: ?a!$s' @ 9l $aq' ?al $aq' @ 9 $l' @

$*'

$i' alculate the mass of sodium car,onate required to make 5< cm!of a mol

dm!solution of sodium car,onate.

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$ii' alculate the volume $in cm!' of 1.8 mol dm!h2drochloric acid required to react

completel2 with

5 cm!of .< mol dm!sodium car,onate solution.

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$iii' alculate the no of molecules in the volume of *as collected from

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1

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B 9

1!

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14

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(f) Bhosphorous $&&&' chloride0 Bl!0 is used in the manufacturin* of pesticides. &t is

made ,2 the direct com,ination of phosphorous and chlorine.

B4 $s' @ l$*' 4Bl!$l'

15 * of B4 was allowed to react with !!* of chlorine *as. /hat is the limitin*

reactant in this reaction and calculate the mass of Bl!produced.

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(g)

15

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[Total: 1

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1"

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[Total: 1

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Total Mar! for t"e #a#er$ 75

1;

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