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1993 - JAMB Chemistry Past Questions and Answers - page 2

11

The air around a petroleum refinery is most likely to contain?

A
CO2, SO3 and N2O
B
CO2, CO and N2O
C
SO2, CO and NO2
D
PH3 H2O and CO2
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12

Water can be identified by the use of?

A
anhydrous copper (II) tetraoxosulphate (VI)
B
anhydrous sodium trioxocarbonate (IV)
C
potassium heptaoxochromate (VII)
D
copper (II) trioxocaronate (IV)
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13

The phenomenon whereby sodium trioxocarbonate (IV) decahydrate loses some of its water of crystallization on exposure to the atmosphere is known as?

A
deliquescene
B
hygroscopy
C
effervescence
D
efflorescence
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14

A student prepares 0.5 M solution each of hydrochloric and ethanoic acids and then measured pH. The result would show that the?

A
pH values are equal
B
HCI solution has a higher pH
C
sum of the values is 14
D
ethanoic acid solution has a higher pH
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15

NH3 + H3O+

→ NH4+ + H2O. It may be deduced from the reaction above that?

A
a redox reaction has occurred
B
H3O+ acts as an oxidizing agent
C
H3O+ acts as an acid
D
water acts as ab acid
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16

4.0 g of sodium hydroxide in 250 cm3 of solution contains?

A
0.40 moles per dm3
B
0.10 moles per dm3
C
0.04 moles per dm3
D
0.02 moles per dm3
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17

During the electrolysis of a salt of a metal M, a current of 0.5 A flows from for 32 minutes 10 seconds and deposits 0.325 g of M, What is the charge of the metal ion?

(M = 65, If = 96,500 C per mole of electron)

A
1
B
2
C
3
D
4
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18

Which of the reactions occurs at the anode during the electrolysis of a very dilute aqueous solution of sodium chloride?

A
OH- - e → OH
B
CIsup>-
C
[]
D
[]
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19

The oxidation states of chlorine in HOCL, HCLO3 and HCLO4 are respectively?

A
-1, +5, and +7
B
-1, -5 and 7
C
+1, +3 and +4
D
+1, +5 and +7
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20

A reaction takes places spontaneously if?

A
∆G = O
B
∆S < O and ∆H > O
C
∆H < T ∆S
D
∆G > O
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