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Chemistry Past Questions

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47 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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47 questions

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Question 21

jamb 1980

If 1 litre of 2.2M sulphuric acid is poured into a bucket containing 10 litre of water,and resulting solution mixed thoroughly, the resulting sulpuric acid concentration will be?

A2.2 M

B1.1 M

CO.22 M

D0. 11 M

E0.20 M

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Question 22

jamb 1980

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1½ litres of an oxide, What is the formula of the oxide?

AXO₃

BX₂O₃

CX₃O₂

DXO₂

ENone of the above

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Question 23

jamb 1980

A sample of an oxide of mercury weighed 1.00g. When this was heated, oxygen was given off, and 1.00g of mercury metal only was left. What is the formula of the oxide?

AHg₂O

BHgO₂

CHgO₂

DHgO

ENone of the above

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Question 24

jamb 1980

10cm3 of CO is mixed and sparked with 100cm3 of air containing 21% O2. If all the volumes measured at S.T.P. the volume of resulting gases would be?

A90cm³

B100cm³

C105cm³

D110cm³

E115cm³

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Question 25

jamb 1980

A solution X on mixing with AgNO₃ solution, gives a white precipitate solution in NH₃. A Solution Y, when added to X, also gives a white precipiate which is soluble on boiling. Solution Y contains?

AAg⁺ion

BPb²⁺ion

CPb⁴⁺ion

DZn²⁺ion

EAl³⁺ion

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Question 26

jamb 1980

The alloy duralumin is used for the building of aeroplanes because it?

Aasborbs heat readily from sure thereby preventing the inside of the plane from getting cold at high attitudes

Breflects sunlight readily, thereby keeping the inside of the plane cool

Cis extremely durable and possesses reflective ability

Dis easily the lightest building material

Epossesses both strenght and lightness

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Question 27

jamb 1980

In an attempt to remove sugar from a breaker containing a quantity of sand and sugar, 2 M ammonium chloride solution was accidentally added instead of water. Which of the following method could be used to remove the ammonium chloride from the mixture?

AFractional distillation

Bcrystallization

CFiltration followed by evaporation

DEvaporation followed by sublimation

EFiltration followed by sublimation

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