JAMB Chemistry Past Questions & Answers - Page 295

1,471.

Which of the following metals can be prepared in samples by the thermal decomposition of their trioxonitrate (V) salts?

A.

Copper and mercury

B.

Silver and copper

C.

Mercury and silver

D.

Magnesium and mercury

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,472.

Which of the following, in clear solution, forms a white precipitate when carbon (IV) oxide is bubbled into it for a short time?

A.

KOH

B.

NaOH

C.

Ca(OH)₂

D.

AI(OH)₃

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,473.

Addition of aqueous ammonia to a solution of Zn⁺⁺ gives a white precipitate which dissolves in an excess of ammonia because?

A.

zinc is amphoteric

B.

zinc hydroxide is readily soluble

C.

zinc forms a complex which is readily soluble in excess ammonia

D.

ammonia solution is a strong base

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,474.

Oxygen gas can be prepared by heating?

A.

ammonium trioxonitrate (V)

B.

ammonium trioxonitrate (III)

C.

ppotassium trioxonitrate (V)

D.

mamgamese (IV) oxide

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,475.

Which of the following salts can be melted without decomposition?

A.

Na₂CO₃

B.

CaCO₃

C.

MgCO₃

D.

ZnCO₃

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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