JAMB Chemistry Past Questions, Answers & Explanations - Chemistry

Jamb Chemistry Questions

Question 6:

JAMB 1986

Which of these represents a redox reaction?

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A AgNO₃ + NaCl â†’ AgCAl + NaNO₃
B H₂S + Pb(NO₃) → PbS + 2HNO₃
C CaCO₃ â†’ CaO + CO₂
D Zn + 2HCl â†’ ZnCl₂ + H₂

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Question 7:

JAMB 1986

20 cm³ of 1.0 molar NH₄OH solution when neutralized with 20.05cm³ of 0.1 molar HCl liberated -102 joules of heat. Calculate the heat of neutralization of NH₄OH?

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A -51.O KJ mol^-
B +57.3 KJ mol^-
C +57.O KJ mol^-
D +51.0 KJ mol^-

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Question 8:

JAMB 1986

What is the consequences of increasing pressure on the equilibrium reaction ZnO_(s) + H_2(g) Zn_(s) + H₂O_(I)?

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A The equilibrium is driven to the left
B The equilibrium is driven to the right
C There is no effect
D More ZnO is produced

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Question 9:

JAMB 1986

The approximate volume of air containing 10cm³ of oxygen is?

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A 20 cm³
B 25 cm³
C 50 cm³
D 100 cm³

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Question 10:

JAMB 1986

The reaction Mg + H₂O â†’ MgO + H₂ takes place only in the presence of?

SchoolNGR Classroom

A Excess Mg ribbon
B Excess cold water
C Very hot water
D Steam

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