WAEC Chemistry Past Questions & Answers - Page 268

1,336.

Consider the compounds represented by the following general formula: X₂SO₄ Y₂(SO₄)₃, 24H₂OX and Y could respectively be

A.

K and AI

B.

Fe and K

C.

AI and Fe

D.

AI and K

E.

Cr and K

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,337.

When iron rusts, it undergoes

A.

deliquescence

B.

chemical decomposition

C.

hydrolysis

D.

redox reaction

E.

combustion

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,338.

What is the change in the oxidation number of phosphorus in the the reaction represented by the following equation? 4P _(s) + 5O₍₂₎_(g) → 2P₂O₅_(g)

A.

0 to + 2

B.

0 to 5

C.

+4 to + 2

D.

+4 to +5

E.

+4 to +7

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,339.

What is the following compounds will not decompose when heated strongly ?

A.

NaHCO₃

B.

K₂CO₃

C.

MgCO₃

D.

Ca(HCO₃)₂

E.

ZnCO₃

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,340.

''The rate a reaction is proportional to the number of effective collisions occurring per second between the reactants''. This statement is associated with the

A.

Kinetic theory

B.

rate law

C.

atomic theory

D.

collision theory

E.

gas laws

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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