1991 - WAEC Chemistry Past Questions and Answers - page 2
The products of the electrolysis of dilute sodium chlorid solution with platinum electrodes are
Which of the following modes of motion is exhibited by the particles of a solid?
Which of the following statements is not correct? Group 7 elements
In which of the following are the substances arranged in their correct order of increasing melting point?
A compound which liberates carbon (IV) oxide from a hydrogentrioxocarbonate (lV) could have the molecular formula
CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ∆H = 890KJ mo-1 ∆H in the reaction represented by the equation above is the enthalpy of
Consider the reaction represented by the equation below: H2(g) + 12(s) ⇌ 2HI(g) ∆H negative. Which of the following takes place when the temperature of the reaction vessel is decreased?
2NaNO3 → 2NaNO2 + O2. From the equation above, what is the volume of oxygen produced at s.t.p. when 8.5g of 2NaNO3 is heated until no further gas is evolved? (2NaNO3 = 85, molar volume of gases at s.t.p. = 22.4dm3)
Esterification of propane 1,2,3-triol and unsaturated higher carboxylic acids will produce
The ratio of reactants to products is 1: 3: 2 in the reaction represented by the equation below: N2,/SUB> (g) → 2NH3(g) which of the following law is demonstrated by this?