JAMB Chemistry Past Questions & Answers - Page 383

1,911.

2CO_(g) + O_2(g) → 2CO_2(g)
Given that ΔH[CO]is -110.4 kJmol^-1 and ΔH[CO₂] is -393.0 kJmol^-1, the energy change for the reaction above is

-503.7 kJ

-282.6 kJ

+282.6 kJ

+503.7 kJ

View answer & explanation

Correct answer is B

Energy change (ΔH) = 2ΔHCO₂ - (2ΔHCO + ΔHO)
= 7x - 393 - (7 * 110.4 + 0)
= -393 + 110.4 = -282.6 kJ

1,912.

The mass of silver deposited when a current of 10a is passed through a solution of silver salt for 4830s is
[Ag = 108, F = 96500 c mol^-1]

108.0g

54.0g

27.0g

13.5gq

View answer & explanation

Correct answer is B

Ag + ie → Ag⁺
If w 96500 C deposit 108g of silver
∴ 10 * 4830 will deposit (10 * 4830 * 108)/96500
= 5216400/96500 = 54.06g

1,913.

In the electrolysis of brine, the anode is

platinum

copper

zinc

carbon

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,914.

Which of the following acts as both reducing and oxidized agent?

H₂

SO₂

H₂S

CO₂

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,915.

ZnO_(s) + CO_(g) → Zn_(s) + CO_2(g)
In the reaction above, Zinc has been

decomposed

displaced

oxidized

reduced

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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