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Chemistry Past Questions

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50 questions JAMB 2505 WAEC 1623 NECO 168 CUSTOM 10

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50 questions

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Question 21

waec 2021

Which of the graphs illustrates the variation of the pH of a given volume of strong acid solution (y-axis) with the volume of strong base titrated against its (x-axis)?

BII

CIII

DIV

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Question 22

waec 2021

Which of the following illustrates the variation of the rate of evolution of gas from a given length of magnesium ribbon (y-axis) with an increase in the concentration of the added (x-axis)?

BII

CIII

DIV

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Question 23

waec 2021

Which of the following pairs of compounds would form a precipitate when their aqueous solutions are mixed?

ANaCl and KNO\(_{3}\)

BKCL and NaNO\(_{3}\)

CK\(_{2}\)SO\(_{4}\) and BaCl\(_{2}\)

DNH\(_{4}\)NO\(_{3}\) and CO\(_{3}\)

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Question 24

waec 2021

The alkanol represented by the structure above is

Aprimary and dihydric

Bsecondary and monohydric

Ctertiary and dihydric

Dsecondary and dihydric

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Question 25

waec 2021

If humid air is polluted by chlorine discharged, the air can be restored by sprinkling

Asolid MnO\(_{2}\)

Bacidified KMnO\(_{4}\)

Cacidified FeSO\(_{4}\)

Dsaturated NaCl(aq)

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Question 26

waec 2021

Cathodic protection of metals is based on

Astandard electrode potential of hydrogen

Bits electrical conductivity

Cnature of oxides formed

Drelative tendencies of oxidation

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Question 27

waec 2021

What is the relative molecular mass of the compound below?

What is the relative molecular mass of the compound below [H = 1.0; C = 12.0; O = 16.0] - SchoolNGR

[H = 1.0; C = 12.0; O = 16.0]

A137

B136

C64

D59

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Question 28

waec 2021

The ratio of carbon atoms of hydrogen atoms in a hydrocarbon is 1:2. If its molecular mass is 56, what is its molecular formula?

AC\(_{3}\)H\(_{6}\)

BC\(_{4}\)H\(_{8}\)

CC\(_{2}\)H\(_{4}\)

DCH\(_{2}\)

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Question 29

waec 2021

Which of the following oxide causes acid rain?

ACO

BNO

CH\(_{2}\)O\(_{2}\)

DNO\(_{2}\)

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Question 30

waec 2021

The hydrolysis of proteins by diluting mineral acids produces

Asucrose

Bglucose

Camino acids

Dfatty acids

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