Chemistry — 2004
WASSCE · 42 questions · Answers included
42 questions
The mass of an element is 27 and its atomic number is 13. What is the composition of the nucleus of its atom?
Which of the following electron transition results in the emission of energy?
Which of the following properties of elements deceases generally across a period in the Periodic Table?
Which of the electrons in the following orbitals will experience the greatest nuclear attraction?
A nuclide emits a beta-particle (e) in the process, that atomic number
One of the characteristics of transition metals is
A metal X forms two chlorides with the formulae XCI 2 and XCI 3 . Where is X in the Periodic Table?
A metal X forms two chlorides with the formulae XCI2 and XCI3. Where is X in the Periodic Table? What type of bonding exists between X and chlorine in each of the chlorides?
Which of the following equipment is not used to detect radioactivity?
The method of collection of gases prepared in the laboratory depend on their
Which of the following pairs of salts undergo hydrolysis?
The alloy used extensively in the building industry is
Which of the following salts is not prepared by precipitation?
What volume of hydrogen would be left over when 300cm 3 of oxygen and 1000cm of hydrogen are exploded in a sealed tube? [2H 2(g) + O 2(g) → 2H 2 O g ]
What are the values of x, y and z respectively in the following in the following equation? \(MnO_{2(s)} + xHCI_{(aq)} → MnCI_{2(g)} + yHO_{(l)} + zCI_{2(g)}\)
Which of the following subtances will not produce effervescence with dilute hydeochloric acid?
What quantity of electrons in moles is needed to discharge two moles of aluminum from aluminum oxide (AI 2 O 3 )
Two solutions containing Pb2+ and AI3+ respectively can be distinguished using
A solution of zinc chloride should not be stored in a container made of
Glucose gives a brick-red precipitate with Fehling's solution because it is
What is the IUPAC name of CH 3 CH 2 COOCH 3 ?
The mass of 800cm 3 of a gas X at s.t.p. is 1.0g. What is the molar mass of X? [1 mole of a gas at s.t.p occupies 22.4dm 3 ]
Which of the following compounds is a soapless detergent?
The reaction that takes place at the cathode when an aqueous solution of NaCI is electrolysed using carbon electrodes is
What of the following pairs of acid and base will produce a solution with pH less than 7 at equivalence point?
WHICH OF THE FOLLOWING SALTS IS READILY SOLUBLE IN WATER?
Which of the following factors that affect the rate of chemical reactions can be explained in terms of the collision theory? l. concentration ll. pressure lll. temperature lV catalyst
An orange drink concentrate is suspected to contain traces of poisonous green dye and a harmless dye having the same boiling point. Which of the following techniques is most suitable for isolating the dyes?
If 60 cm 3 of gas is heated from 27 o C TO 50 o C, what is the new volume of the gas at constant pressure?
Consider the cell represented below: Zn/Zn 2+ (aq) // Cu 2+ (aq) / Cu (s) . Which of the following statements is correct about the cell
When ammonium trioxocarbonate (IV) solution is added to separate solutions of calcium, zinc and sodium salt precipitate could be formed in the case of
The condensation of several amino acid molecules gives
Which of the following statements is true of an endothermic reaction? I. Heat is absorbed from the surrounding II. The heat content of the products is more than that of the reactants III. The enthalpy change is positive IV. The surrounding is at a lower temperature than the system.
What is the change in the oxidation number of 1 - in the reaction represented by the following equation? 51 -1 (aq) + 6H + (aq) + 1O - 3(aq) → 31 2(g) + 3H 2 O (l)
The key factor to be considered in siting a chemical industry is
Which of the following reactions will be affected by change in pressure at equilibrium?
WHICH OF THE FOLLOWING PETROLEUM FRACTIONS YIELDS VASELINE AND PARAFFIN WAX ON REDISTILLATION?
What is the product Cx Hy in the following equation? \(C_{10}H_{22}\) → \(C_{8}H_{18}\) + CxHy
Which of the following is required in an experiment to determine the enthalpy of solution of anhydrous CuSO? l. Mass of the anhydrous CuSO 4 II. Volume of water in which the CuSO 4 is dissolved lll. lnitial temperature of water lV. Final temperature of the solution
Which of the following pollutants is biodegradable?
The process of seeding during the extraction of aluminium involves the addition of pure AI(OH) 3 crystals in order to
Which of the following measures is not suitable for controlling water pollution?