WAEC Chemistry Past Questions & Answers - Page 231

1,151.

Which of the following is used as water softener?

A.

Na₂CO₃.10H₂O

B.

CuSO₄. 5H₂O

C.

MgSO₄. 7H₂O

D.

CaCI₂.2H₂O

E.

Na₂SO₄. 10H₂O

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,152.

Which of the following when heated strongly in air will leave a metal as residue?

A.

Sodium trioxonitrate (V)

B.

Potassium trioxonitrate (V)

C.

Silver trioxonitrate (V)

D.

Lead (ll) trrioxonitrate(V)

E.

Aluminium trioxonitrate (V)

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,153.

When chlorine is added to slaked lime, the product obtained is

A.

bleaching powder

B.

chlorinated water

C.

hydrochloric acid

D.

oxochlorate (l) acid

E.

trioxochlorate (V) salt

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,154.

Which of the substance lettered P to V in the equation below would be left on the filter paper if the reaction mixture were filtered? P _(aq) + Q_(aq) → V_(s) + R_(aq) + T_(g)

A.

P

B.

Q

C.

V

D.

T

E.

R

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,155.

The use of diamond in abrasives is due to its

A.

high melting point

B.

high melting point

C.

lustre

D.

hardness

E.

octahedral shape

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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