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JAMB Chemistry Past Questions & Answers - Page 145

721.

In the reaction Fe + Cu²⁺ $\to$ Fe²⁺ + Cu,iron displaces copper ions to from copper. This is due to the fact that

iron is in the metallic from while the copper is in the ionic from

the atomic weight of copper is greater than that of iron

copper is greater than iron

copper metal has more electrons than iron metal

iron is higher in the electrochemical series than copper

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

722.

In which of the following processes is iron being oxidized?

1 Fe + H₂SO₄ → FeSO₄ +H₂

2 FeSO₄ + H₂S → FeS + H₂SO₄

3 2FeCI₂ + Cl₂ → 2FeCl₃

4 2FeCl₃ + SnCl₂ + → 2FeCl₂ + SnCl₄

1 only

2 only

3 only

1 and 3

2 and 4

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

723.

In the reaction M + N P;∆H = + QKJ. Which of the following would increase the concentration of the product?

Decreaseing the concentration of N

Increasing the concentration of P

Adding a suitable catalyst

Decreasing the temperature

Increasing the temperature

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

724.

The colour imparted to a flame by calcuium ion is

green

blue

brick-red

yellow

lilac

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

725.

Which of the following relationships between the pressure P, the volume V and the temperature T, represents an ideal gas behaviour?

P $\alpha$ VT

P $\alpha$ T/V

PT $\alpha$ V

PV $\alpha$ I/T

P $\alpha$ V/T

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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