JAMB Chemistry Past Questions & Answers - Page 227

1,131.

A substance Z reacts with NaOH to give salt and water only. When Z is treated with dilute HCl, a gas is evolved which gives a yellow suspension on passing into concentrated H2SO4. Substance Z is?

A.

NaHS

B.

Na₂SO₃

C.

Na₂S

D.

NaHSO₃

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,132.

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

A.

HCl

B.

HOCl

C.

O₂

D.

Cl₂O

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,133.

Which of the following sulphides is insoluble in dilute HCl?

A.

Na₂S

B.

ZnS

C.

CuS

D.

FeS

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,134.

Which of the following metals does NOT form a stable trioxocarbonate (IV)?

A.

Fe

B.

Al

C.

Zn

D.

Pb

E.

none of the options is correct

View answer & explanation

Correct answer is E

Fe, Al, Pb, and Al trioxocarbonate(IV) compounds are decomposed by heat to their oxide and carbon(IV) Oxide

1,135.

In the course of an experiment, two gases X and Y were produced. X turned wet lead ethanoate to black and Y bleached moist litmus paper. What are the element(s) in each of the gases X and Y respectively?

A.

H and S;Cl

B.

H and O;Cl

C.

H and S;C and O

D.

H and Cl;S and O

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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