WAEC SSCE - Chemistry - 2017 (Objective)

Which of the following species determines the chemical properties of an atom?

The ionization energy is affected by the following factors except

Which of the following statements is correct?

The common feature of reactions at the anode is that

The oxidation number of nitrogen in \(Pb(NO_{3})_{2}\) is

Which of the following metals has the strongest metallic bond?

Soluble salts can be prepared by the following methods except

If 0.2g of a salt is required to saturate 200\(cm^{3}\) of water at room temperature, what is the solubility of the salt?

Which of the following arrangements indicates the correct decreasing order of ionization energy of period 3 elements?

The bond angle in tetrahedral molecules such as tetrachloromethane is 

The reason for the decrease in the atomic size of elements across a period is that

Which of the following factors characterize members of the same homologous series?

Atomic orbital is

Which of the following pairs of gases are pollutants from car exhaust?

Classification of alkanols is based on the 

Which of the following statements is NOT a chemical property of an acid?

The purity of a solid sample can best be determined by its

Consider the following reaction equation: \(2NO_{(g)} + O_{{2}{(g)}} \to 2NO_{{2}{(g)}}\). What is the change in the oxidation number of nitrogen?

Which of the following substances does not have van der Waals' forces?

The species with no electron in the 3d-orbital is

The seperation of Nitrogen from oxygen using fractional distillation of air is possible because

The name of the compound \(C_{4}H_{9}COOC_{3}H_{7}\) is

A primary alkanol has a molecular mass of 60. What is the structural formula of the compound? [C= 12.0, H= 1.0, O= 16.0)

The real harmful effect of the release of chlorofluorocarbons into the atmosphere is that it eventually causes

Chemical reactions occurs when the colliding reactants have energy that is

Which of the following gases is not acidic?

Pauli exclusion principle is related to

In a saturated solution at a given temperature, the undissolved solutes are in equilibrium with

The mass of one mole of \((NH_{4})_{2}CO_{3}\) is   [O=16.0, N=14.0, C=12.0, H=1.0]

The number of atoms present in 2.5moles of a triatomic gas is equivalent to   [1mole = \(6.02\times 10^{23}\)]

The property of a chemical reaction that is affected by the presence of a catalyst is

When water was added to a white anhydrous substance X, the colour changed to blue. X is

The following glasswares are used to measure the volume of liquids EXCEPT

Graphite and Diamond are similar in that they

A hydrocarbon contained 14.3% hydrogen. The empirical formula for the hydrocarbon is   [H= 1.0, C= 12.0]

Potassium Chloride solid does not conduct electricity because

Calculate the mass of copper deposited if a current of 0.45A flows through \(CuSO_{4}\) solution for 1hour 15mins.   [Cu=64.0, S= 32.0, O =16.0, 1F= 96500C]

The oxidation number of X in \(XO_{4}^{3+}\) is

The properties of a good primary standard include the following except

Fats and oils can be obtained from any of the following sources except

The condensation of two units of glucose will produce a dissacharide with the formula \(C_{12}H_{22}O_{11}\) which is

Halogens generally react with metals to form

Petroleum is a non-renewable source of energy because it

The property of elements which increases down a group of the periodic table is

The IUPAC name for the compound \(ClCH_{2}CH_{2}OH\) is

A 0.1\(moldm^{-3}\) solution of sodium hydroxide was diluted with distilled water to 0.001\(moldm^{-3}\). What is the dilution factor?

When Magnesium reacts with oxygen, heat is 

Solubility curve can be used in the determination of the

The use of diamond in abrasives is due to its

Which of the following statements about endothermic reaction is correct?