WAEC SSCE - Chemistry - 2012 (Objective)

The shape of a graphite crystal is

Which of the following electron configurations represents that of an atom in its ground state?

The number of sulphur atoms in 3.20g of SO\(_{2(g)}\) is [O = 16.0;S = 32.0; Avogadro constant = 6.02 x 10\(^{23}\)]

Which of the following substances would not produce ethanol when fermented?

A sample of a gas may be identified as chlorine if it turns

The vapour pressure of a liquid depends on l. temperature. ll. rate of condensation. III. cohesive forces holding the particles together

Which of the following ions has an electron configuration different from the other?

On heating, the following trioxocarbonate (IV) salts decompose to give solid residue except

The oxidation number of Fe in [Fe(CN)\(_6\)]\(^{3-}\) is

Which of the following devices function on redox reaction? l. Dry cell ll. Car battery III. Electric generator

A substance L reacts with NH\(_4\)NO\(_{3(aq)}\) to generate ammonia gas. L is likely to be

The complex compound formed when aluminum dissolves in aqueous sodium hydroxide is

An alkanol can be prepared by the reaction of an alkene with

The complex compound formed by the combination of two elements with a large electronegativity difference is likely to be

Consider the reaction represented by the following equation: xCH\(_3\)OH + yO\(_2\) → 2CO\(_2\) + zH\(_2\)O. The values of x,y and z respectively, are

Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]

Which of the following metals would readily displace hydrogen from steam?

Consider the reaction represented by the following equation: CuO\(_{(s)}\) + H\(_2\)SO\(_{4(aq)}\) → CuSO\(_{4(aq)}\) + H\(_2\)O\(_{(l)}\). Which of the following factors will not affect the rate of the reaction?

Which of the following substances is mainly responsible for the depletion of the ozone layer?

Which of the following elements is a metalloid?

Consider the following reaction equation: CaCO\(_{3(s)}\) + 2HCI\(_{(aq)}\) → CaCl\(_{2(aq)}\) + H\(_2\)O\(_{(l)}\) + CO\(_{2(g)}\). What mass of CaCI\(_2\) would be obtained when 25.0g of CaCO\(_{3(s)}\) is reacted with excess HCI\(_{(aq)}\)? [CaCO\(_3 = 100; CaCI\(_2\) = 111]

The d-block elements are paramagnetic because they

Which of the following statements about a radioactive substance is/are correct? l. lt emits radiation continuously and spontaneously. ll. The emitted radiations are affected by temperature and pressure III. The radiation can penetrate opaque matter

At ordinary temperature H\(_2\)O is a liquid while H\(_2\)S is a gas. This is because H\(_2\)O has

Two elements, X and Y are in the same group on the periodic table because they both have the same

A spot of oil paint on a shirt can best be removed using

The number of orbitals in a p-sub level of an atom is

The atomic radii of metals are usually

Which of the following halogens is liquid at room temperature?

The energy evolved when magnesium burns in air is in the form of

A metal M forms two types of chlorine, MCl\(_2\) and MCl\(_3\) which of the following laws best explains the relationship between the chlorides? Law of

A tertiary alkanol has a molecular formula C\(_4\)H\(_{10}\)O. What is the structural formula of the compound?

The hydrolysis of NH\(_4\)CI gives

Consider the following reaction equation: C\(_{16}\)H\(_{34}\) → C\(_5\)H\(_{12}\) + C\(_{11}\)H\(_{22}\). The process represented by the equation is

Which of the following pH values indicates that a solution is a strong base?

Which of the following industrial processes depends on the action of enzymes?

The volume occupied by 0.4 g of hydrogen gas at s.t.p. is [H = 1. 00; Molar volume at s.t.p. = 22.4 dm3]