JAMB Chemistry Past Questions & Answers - Page 273

1,361.

If an equilibrium reaction has ∆H < O, the reaction will proceed favorably in the forward reaction at?

A.

low temperatures

B.

high temperatures

C.

all temperatures

D.

all pressures

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,362.

Cr₂O₇^2-_(aq) + 14H⁺_(aq) + 6l^-_(aq) → 2Cr³⁺_(aq) + 3l_(g) + 7H₂O_(I).
The change in the oxidation number of oxygen in the equation above is?

A.

0

B.

1

C.

2

D.

7

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,363.

Which of the following is a redox reaction?

A.

KCI_(aq) + H₂SO_4(aq) → KHSO_4(aq) + HCI_(aq)

B.

2FeBr_2(aq) + Br_4(aq) → 2FeBr_3(aq)

C.

3AgNO_(aq) + FeCl_3(aq) → 3AgCl_(aq) + Fe(NO₃)_3(aq)

D.

H₂CO_3(aq) → H₂O_(I)2- + CO_2(g)

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,364.

2CL^-_(aq) → CI_2(g) + 2e^-(aq). The above half-cell reaction occuring at the anode during the electrolysis of dilute ZnCI₂ solution is?

A.

ionization

B.

oxidation

C.

reduction

D.

recombination

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,365.

How many moles of copper would be deposited by passing 3F of electricity through a solution of copper (II) tetraoxosulpohate (IV)?

(F = 96 500 C mol^-)

A.

0.5

B.

1.0

C.

1.5

D.

3.0

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

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