2013 - JAMB Chemistry Past Questions and Answers - page 2

If 24.4 g of lead (ll) trioxonitrate (V) were dissolved in 42 g of distilled water at 20^oC; calculate the solubility of the solute in gdm^-3.

The solvent used for removing grease stain is

In a water body, too much sewage leads to

10.0 dm³ of water was added to 2.0 mol dm^-3 of 2.5dm³ solution of HCl. What is the concentration of the final solution in mol dm^-3?

Three drops of a 1.0 mol dm^-3 solution of HCl was added to 20 cm³ of a solution of pH6.4. The pH of the resulting solution will be

Which of the following substances is not a salt?

An insoluble salt can be prepared by

2H₂O _(l) + 2F_2(g) → 4HF_(aq) + O_2(g).

In the reaction above, the substance that is being reduced is

In an electrochemical cell, polarization is caused by

Calculate the volume in cm³ of oxygen evolved as s.t.p. when a current of 5 A is passed through acidified water for 193s

{F = 96500 Cmol^-1, Molar volume of a gas at s.t.p. = 22.4 dm³}