1989 - WAEC Chemistry Past Questions and Answers - page 2
Which of the following gases will bleach moist litmus paper?
Given that for the reaction KOH (aq) + HCI(aq) → KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) → Na2SO4(aq) + 2H 2O(l)?
When an element can exist in two or more forms in the same physical state, the element is said to exhibit
Which of the following carbohydrates does NOT usually occur in the crystalline form?
Copper can best be purified by
Locally produced soap in which wood ash is used as the base is usually soft because the wood ash contains a lot of
Why is potassium fluoride added to the electrolyte in the extraction of sodium from fused sodium chloride?
The rate of the hydrogen in the reaction Zn(s) + 2HCI (aq) → ZnCI 2(g) + H 2(aq) + H 2(g) can be increased by
Octane number is highest in petrol containing a high proportion of
Given the following half-cell reaction; 2Cl(aq) → CI2(g) + 2e, how many mole of electrons will be required to produce 1.12dm3 of chlorine gas at s.t.p? (Molar volume of a gas at s.t.p. = 22.4dm 3)