Preguntas de Chemistry | JAMB CBT PRACTICE 2025 | Page 6

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Question 26

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 27

In an electrochemical cell, polarization is caused by

A)  

Chlorine

B)  

Oxygen

C)  

Tetraoxosulphate(VI) acid

D)  

Hydrogen

How to solve?

Question 28

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 29

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 30

An insoluble salt can be prepared by

A)  

The reaction of trioxocarbonate(V) with an acid

B)  

Double decomposition

C)  

The action of dilute acid on an insoluble base

D)  

The reaction of metals with an acid

How to solve?

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