Jamb Chemistry 2012 Past Questions and Answers

Question 6:

• JAMB 2012

2H_2(g) + O_2(g) → 2H₂ O_(g)
In the reaction above, what volume of hydrogen would be left over when 300 cm³ of oxygen and 1000 cm³ of hydrogen are exploded in a sealed tube?

A. 200 cm³
B. 400 cm³
C. 600 cm³
D. 700 cm³

Question 7:

• JAMB 2012

l . Evaporation. ll. Sublimation. lll. Diffusion. IV. Brownian motion.
Which of the above can correctly be listed as evidences for the particulate nature of matter?

A. I and lll only
B. Ll and lV only
C. L, ll and lll only
D. L, ll, lll and lV

Question 8:

• JAMB 2012

If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?

A. Dative
B. Covalent
C. Lonic
D. Metallic

Question 9:

• JAMB 2012

A hydrogen atom which has lost an electron contains

A. One proton only
B. One neutron only
C. One proton and one neutron
D. One proton, one electron and one neutron

Question 10:

• JAMB 2012

The electronic configuration of Mg ²⁺ is

A. Ls ²2s ²2P ⁶3s²3P²
B. Is²2s²2P⁶
C. Ls²2s²2p⁶3s²
D. Ls²2s²2P⁴