1992 WAEC SSCE Chemistry Past Questions

1992

All your burette readings (initial and final), as well as the size of your pipette, must be recorded but on no account of experimental procedure is required. All calculations must be done in your answer book.F is a solut…

1992

Credit will be given for strict adherence to instructions, for observations precisely recorded and for accurate inferences. All tests observations and inferences must be clearly entered in your answer book. in ink, at th…

1992

(a)(i) Define a standard solution(ii) Give the reason why a standard solution of sodium hydroxide cannot be made by weighing out accurately a given mass of the solid and making it up to the required volume of solution(b)…

1992

(a)(i) List two uses of aluminium and state how each use is related to the properties of the element.(ii) State the reason why aluminium oxide is said to be amphoteric.(b) Calcium is extracted by the electrolysis of fuse…

1992

(a)(i) State Graham's law of diffusion.(ii) Consider the reaction represented by the following equation:N\(_2\)O\(_{4(g)}\) 2NO\(_{2(g)}\)Night yellow dark brownState what would happen to the vapour density of N\(_2\)O\…

1992

(a) Give the products of the following reactions:(i) hydrolysis of simple proteins.(ii) alkaline hydrolysis of fats and oils.(b) A combustion tube was packed with small pieces of broken clay pot and the tube maintained a…

1992

(a)(i) State three differences between electrovalent compound and covalent compound.(ii) Name the type of chemical bonding involved in the formation of ammonium ion from ammonia.(b)(i) Name the quantum numbers which defi…

1992

(a) Name: (i) one structural isomer of glucose.(ii) the process by which starch is converted to glucose.(b) The open-chain structure of glucose is shown below.(a) State the functional groups present in the structure.(ii)…

1992

(a) What is meant by the term acid salt? Give one example.(b) State the reason why an all-glass apparatus must be used for the laboratory preparation of concentrated trioxonitrate (V) acid.

1992

(a) Name one metal in each case Which:(i) exists as a liquid at room temperature,(ii) can be found in nature in the uncombined state(b) X and Y are 0.5 mol. dm\(^{-3}\) freshly prepared aqueous solutions of two salts of…

1992

(a) Three elements A, B and C have atomic numbers 8, 11 and 12 respectively.(i) Write the formula of the compound formed by the chemical combination of A and B.(ii) State which of the three elements belong(s) to the s-bl…

1992

(a) Give one example of naturally-occurring acids(b) If 0.5 mole of a mono-alkanoic acid weighs 44g, determine the molecular formula and the name of the acid. (H = 1, C = 12, O = 16)

1992

Magnesium ribbon reacts with dilute hydrochloric acid at room temperature.(a) State three ways by which the reaction can be made to proceed faster(b) Write an equation for the reaction.

1992

(a) Give the electrolyte of a named secondary electrochemical cell.(b) Consider the cell represented as shown below: \(Cu_{(s)}Cu^{2+}_{(aq)}/Zn^{2+}_{(aq)}/Zn{(s)}\)(i) What does the vertical double stroke represent?(ii…

1992

(a) Name the crystalline allotrope of sulphur that is stable at room temperature.(b)(i) Give one example of a fuel that contains significant amount of sulphur as an impurity.(ii) State one environmental disadvantage of u…

1992

(a) State the main ore of tin.(b) Write an equation for the reaction involved in the smelting of purified tin ore(c) List two alloys of tin

1992

(a) State the method of collecting gases which are denser than air.(b) Name two gases that can be used to perform the fountain experiment in the laboratory. State the physical property which makes it suitable for the exp…

1992

Methanol is obtained from wood by

1992

When steam is passed over white-hot coke, the products are

1992

The reactions ethyne are mainly

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