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Chemistry Past Questions

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3536

(a) State two properties of alkalis

(b)(i) Why is tetraoxosulphate (VI) acid able to produce two types of salt?

(ii) Write an equation for the reactior involved on heating sodium trioxosulphate (IV) with hydrochloric acid.

View Answer & Discuss WAEC 1997
3537

Consider the reaction represented by the following Q equation: N\(_2\)O\(_{4(g)}\) \(\rightleftharpoons\) 2NO\(_{2(g)}\)  \(\Delta\)H = +57.2KJmol\(^{-1}\)

(a) When is the reaction said to be at equilibrium?

(b) Mention two conditions that can favour the forward reaction

(c) Name the principle involved in (b) above.

View Answer & Discuss WAEC 1997
3538

(a) List two products obtained when crude oil is refined

(b)(i) What is the general formula for alkanols?

(ii) State the type of reaction involved in the conversion of ethanol to ethanoic acid

(iii) Write an equation to show how ethanoic acid reacts with sodium trioxocarbonate (IV).

View Answer & Discuss WAEC 1997
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3539

(a) State Gay Lussac's law of combining volumes

(b) Hydrogen reacts with oxygen according to the following equation;

2H\(_{2(g)}\) + O\(_{2(g)}\) ---> 2H\(_2\)O\(_{(g)}\). If 50cm\(^3\) of hydrogen were sparked with 30cm\(^{3}\) of oxygen, calculate the volume of unused oxygen after cooling to the initial temperature and pressure.

View Answer & Discuss (2) WAEC 1997
3540

(a) Mention three chemical properties of chlorine

(b) What type of reaction is represented by each of the following equations?

(i) Mg\(_{(s)}\) + 2HCI\(_{(aq)}\) --> Mg\(_2\)Cl\(_{2(aq)}\) + H\(_{2(g)}\)

(ii) Ag\(^+_{aq}\) + Cl\(^-\)\(_{(aq)}\) ----> AgCl\(_{(s)}\)

View Answer & Discuss WAEC 1997
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