Jamb Chemistry 2012 Past Questions and Answers

Question 21:

• JAMB 2012

During a titration experiment, 0.05 moles of carbon (lV) oxide is liberated. What is the volume of gas liberated?

A. 22.40 dm ³
B. 11.20 dm ³
C. 2.24 dm ³
D. 1.12 dm ³

Question 22:

• JAMB 2012

A major factor considered in selecting a suitable method for preparing a simple salt is its

A. Crystalline from
B. Melting point
C. Reactivity with dilute acids
D. Solubility in water

Question 23:

• JAMB 2012

The oxidation number of boron in NaBH ₄ is

A. -3
B. -1
C. +1
D. +3

Question 24:

• JAMB 2012

2Na ₂ O _2(s) + 2H ₂ O ₂₍₁₎ → 4 NaOH_(s) +O_2(s)
The substance that is oxidized in the reaction above is

A. 2NaO_2(s)
B. NaOH(aq)
C. H₂O₍₁₎
D. O_2(g)

Question 25:

• JAMB 2012

What number of moles of Cu 2+ will be deposited by 360 coulombs of electricity?
[f = 96500 C mol -1]

A. 5.36 x 10 ^-4 mole
B. 1. 87 x 10 10 ^-3 mole
C. 9. 35 x 10 ^-4 mole
D. 3. 73 x 10 ^-3