Chemistry — 2007
WASSCE · 39 questions · Answers included
39 questions
When sodium atom form the ion Na+,
Which of the following statements about rare gases are correct?
Which of the following properties is characteristic of the halogens?
In which of the following atoms is the ionic radius larger than the atomic radius? [ 11 Na, 12 Mg, 13 AI, 17 CI]
A transition metal would be expected to
Which of the following properties of atoms generally increases down a group in the periodic table?
Which of the following statements about sodium is not true?
If the difference between the electronegativities of two elements is large, the type of bond that can be formed between them is
Which of the following compounds has hydrogen bonds between its molecules?
Which of the following species does not contain a co-ordinate bond?
14.8 g of a salt (z)dissolved in 250 cm 3 of distilled water gives a concentration of 0.80 mol dm -3 . Calculate the molar mass of the salt (z).
How many atoms are there in one mole of hydrogen gas? [Avogadro's constant = 6.02 x 1023mol-1]
What is the IUPAC name of the compound represented by the molecular formula NaCIO 4 ?
When air is successively passed through sodium hydroxide solution, alkaline pyrogallol and then concentrated tetraoxosulphate (VI) acid, its remaining components are
Which of the following gases is light than air?
Which of the following statements is true of the molecules of a gas under ideal conditions? The molecules
In which of the following compound (s) will heat be absorbed on adding water? l. KNO\(_3\) II. Concentrated H\(_2\)SO\(_4\) III. NH\(_4\)CI
Consider the reaction represented by the equation: Ca(OH) 2(aq) + CO 2(g) → CaCO3 (s) + H 2 O (l) in the reaction above, CO 2 acts as
Which of the following compounds is a basic salt?
What process is illustrated below? S(s) ⇌H2O⇌ S (aq)
A solution of a salt X reacts with AgNO 3 solution to give white precipitate which dissolves in excess aqueous ammonia. X contains
Consider the reaction represented by the following equation: N 2(g) + 3H 2(g) ⇌ 2NH 3(g) ; ∆H = - 92kJmol 1 . Finely divided iron is used as catalyst in the reaction in order to
Which of these cell notations is the correct representation of a Daniell cell?
What is the oxidation number of chromium in K 2 CrO 4 ?
What product is formed at the cathode during the electrolysis of concentrated sodium chloride solution using carbon electrodes?
Which of the following substances is suitable solvent for perfumes?
The complete hydrogenation of C 6 H 6 in the presence of nicked catalyst at 200 o C gives
Which of the following pairs of substances can be distinguished by use of NaHCO 3 solution?
Alkenes undergo the following reactions except
Hydrocarbons which react with ammoniacal copper (l) chloride solution conform to the general molecular formula
Consider the reaction below: Vegetable oil \(\frac{H2;NI catalyst}{High temperature}\) product. The reaction is applied in the manufacture of?
Which of the following compounds reacts readily with sodium to liberate hydrogen?
Glucose reduces Fehling's solution on warming to
from the following ores is iron extracted? I. Haematite ll. Bauxite III. Magnetite IV. Cassiterite
Which of the following methods can be used to separate a mixture of two miscible liquids with different boiling points?
The following substances are heavy chemicals except
Pig-iron is brittle because it contains
What volume will 0.5 g of H 2 occupy at s.t.p? [H = 1; 1 mole of a gas occupy 22.4 dm 3 at s.t.p.]
Which of the these metals will not liberate hydrogen from dilute HCI?