WAEC SSCE - Chemistry - 2020 (Objective)

f 5.0 cm\(^-3\) of 0.200 mol dm(^-3\) Na\(_2\)CO\(_3\) was diluted to 250cm(^-3\) solution, what would be the concentration of the resulting solution?

Which of the following pairs of elements has the greatest difference in electronegativity?

Which of the following reactions are always exothermic? 1. Neutralization Il. Decomposition III. Combustion

A factor that is considered most important when siting a chemical industry is?

Group VIl elements in their combined states are called?

Which of the following statements is correet for a reaction at equilibrium?

How many electrons does  \({31}_{15}\)P\(^3-\) contain?

Which or the following substances is a polypeptide?

Which of the following standard conditions is not correct about energy changes?

Which of the following arrangement of elements is in decreasing order of electronegativity?

A balanced chemical equation is based on the law of?

What volume of oxygen at s.t.p is required to burn completely 7.5 dm\(^3\) of methane according to the following equation?

CH\(_4\) \(_g\) + 20\(_2\) \(_g\)  → CO\(_2\) \(_g\) + H\(_2\)O\(_g\)

The boiling point of pentane is higher than that of propane because?

When 250 cm3 of a saturated solution of CuSO\(_4\) at 30°C was evaporated to dryness, 5.0 g of the salt was obtained..

What is the solubility of the salt at 30°C? [CuSO\(_4\) = 160]

Which of the following pairs of properties of alkali metals decreases down the group?

The initial volume and pressure of a given mass of gas is V and 3.P. What is its pressure if its volume is increased to  2V at constant temperature?

Which of the following compounds would release hydrogen when reacted with sodium metal? 

I. CH\(_3\)COOH

II. CH\(_3\)CH\(_2\)OH

III. CH\(_3\)COOCH\(_3\)

 "Electrons always occupy the lowest empty energy level" is a statement of

Which or the following products could be formed during incomplete combustion of a hydrocarbon.

i.Carbon ii. Hydrogen III. Carbon (Il) oxide

The oxidation state of chlorine in NaClO\(_3\) is?

Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would the reaction be slowest?

The following molecules have double covalent bonds between two atoms except?

What is the mass of silver deposited when 24,125 C of electricity is passed through a solution or silver salt.

[Ag = 108, IF = 96,500 C ]

Which of the following substances is an example of a fine chemical?

Which of the following processes is not exhibited by atoms in order to attain more stable electron configuration?

. If 20 cm\(^3\) of sodium hydroxide was neutralized by 20 cm\(^3\) of 0.01 mol dm3 tetraoxosulphate(VI) acid, what is the concentration of the solution?

The most suitable process of obtaining water from an aqueous solution of sugar i

The atomic number of an atom would be equal to its mass number if it

The IUPAC name of the compound represented by the structure below is ?

Dilution factor is the?

When an ionic bond is broken, bonding electrons are

Calcium chloride is an ionic compound. Which of the following statements account for its ionic character?

I. Calcium has high ionization energy.  II. Calcium has low ionization energy. III. Chlorine has high electron affinity. IV. Chlorine has high Ionization energy.

The metallic bond in magnesium is stronger than that in calcium because magnesium has a

Which of the following solids would not decompose on heating?

Which of the following metals does not react with water to produce hydrogen?

which of the following quantities is a molar quantity?

What quantity of electrons is lost when one mole of iron (II) ions is oxidized to iron (III) ?

An example of a biodegradable pollutant is?

Which of the following oxides has a giant covalent structure?

The high solubility of ethanol in water is due to?

Consider the reaction represented by the following equation:

AgNO\(_3\) + NaCl → AgCl + NaNO\(_3\).

The steps that could be taken to obtain pure dry sample of AgCI (s) from the mixture includes

Which of the following hydroxides is not readily soluble in water?

Which of the following compounds has the lowest boiling point?

The bond between NH\(_3\) and H\(^+\) in NH4\(^+\) is?

How many moles of H\(_2\)SO4 are there in 50 cm\(^3\) of 0.108 mol dm\(^3\) solution of the acid?

Which of the following statements about the solubility of a salt is correct?

The type of isomerism exhibited by cis and trans isomers is?

An alkanol containing 60% carbon by mass would have a molecular formula [H=1.0. C-12.0, O= 16.0]

Which of the following substances is not a reducing agent?