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JAMB Chemistry 2013 Past Questions: Practice Test with Answers

Creado por: juanbacan
Free JAMB Chemistry 2013 past-questions practice test with answers and clear explanations. Topics include stoichiometry, gas laws, organic reactions, electrochemistry and equilibrium.Sin descripción disponible.
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Question 21

2H2O(l) + 2F2(g) → 4HF(aq) + O2(g). In the reaction above, the substance that is being reduced is

A)

O2(g)

B)

H2O(l)

C)

F2(g)

D)

HF(aq)

How to solve?

Question 22

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s). In the reaction above, the oxidizing agent is

A)

CuSO4(aq)

B)

ZnSO4(aq)

C)

Cu(s)

D)

Zn(s)

How to solve?

Question 23

In an electrochemical cell, polarization is caused by

A)

Chlorine

B)

Oxygen

C)

Tetraoxosulphate(VI) acid

D)

Hydrogen

How to solve?

Question 24

Calculate the volume in cm3 of oxygen evolved at s.t.p. when a current of 5 A is passed through acidified water for 193 s. {F = 96500 C mol−1, molar volume at s.t.p. = 22.4 dm3}

A)

224.000 dm3

B)

0.056 dm3

C)

0.224 dm3

D)

56.000 dm3

How to solve?

Question 25

In an endothermic reaction, if there is a loss in entropy the reaction will

A)

Be indeterminate

B)

Be spontaneous

C)

Not be spontaneous

D)

Be at equilibrium

How to solve?

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