2012 - JAMB Chemistry Past Questions and Answers - page 1
Which of the following methods can be used to obtain pure water from a mixture of sand, water and methanoic acid?
How many atoms are present in 6.0g of magnesium?
[Mg = 24, NA = 6.02 x 1023 mol-1]
50 cm3 of gas was collected over water at 10oC and 765 mm Hg. Calculate the volume of the gas at s.t.p. if the saturated vapour pressure of water at 10 oC is 5mm Hg
An increase in the pressure exerted on gas at a constant temperature results in
2H2(g) + O2(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?
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?
If the elements X and Y have atomic numbers 11 and 17 respectively, what type of bond can they form?
A hydrogen atom which has lost an electron contains
The electronic configuration of Mg 2+ is
Group VII elements are