WAEC SSCE - Chemistry - 2019 (Objective)

Which of the following methods is NOT used  for the separation of mixtures?

A solid with higher melting and boiling points is likely to be?

which of the following organic compounds has the lowest boiling point?

If a catalyst is added to a system, the temperature and the pressure remain constant, there would be no effect on the? 

The oxidation of chromium in Cr\(_2\)O\(_7)\(-2\) ?

The properties of a good primary standard solution include the following except?

The most suitable indicator for the reaction between NaOH and HCOOH is?

The name of the compound CH\(_3\)C(CH\(_3\))CH\(_2\)CH\(_2\)CH\(_3\)

Biotechnology is applied in the? 

consider the reaction represented by the following equation: 2SO\(_2\) + O\(_2\)  ⇌ 2SO\(_3\) 

A decrease in the pressure of the reaction would

What is the percentage by mass of H in  CH3COOH

consider the following reaction equation: 2NH\(_3 \) .+ 3Cl\(_2\) → N2 + 6HCl. 

NH\(_3\) is acting as?

If the oxidation potential of Mg and Al are +2.37 volts and + 1.66 volts respectively, then the Mg would?

Which of the following pairs of components have the same molecular mass?

[ H = 1.0, C = 12.0, O = 16.0 ]

The process by which alkanoic acid reacts reversibly with alkanols is known as?

consider the following reaction equation: 2Al(OH)\(_3\) + 3H\(_2\)SO\(_4\) →Al\(_2\)(SO4)\(_3\)(aq)+6H\(_2\)O. How many moles of tetraoxosulphate(vi)acid is needed to produce 0.5mol of aluminium tetraoxosulphate(vi)?

Stoichiometry is based on the law?

When excess chlorine is mixed with ethane at room temperature, the product formed is?

which of the following solutions containing one mole per dm\(^3\) of the compound would have the lowest PH?

which of the following reagents could be used to distinguish between propan-1-ol and propan-2-ol

If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?

Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)

[ H = 1.0, Mg = 24.0 ]

which of the following pairs of substances has the highest heat of neutralization?

When an equilibrium is established between dissolved and undissolved solutes, the solution is said to be?

Vinegar is an aqueous solution of?

How many moles of carbon(iv)oxide contains 16.0g of oxygen?

[ C = 12.0, O = 16.0 ]

The atoms of \(^{64}_{29}\)Cu and \(^{65}_{30}\)Zn have the same number of?

Consider the following reaction represented by the following equation: C\(_2\)H\(_2\)  \(^{H\(_2\)}_{→}\) X  \(^{H\(_2\)}_{→}\) Y.  X and Y respectively are?

What is the name of the gas liberated when diluted hydrochloric acid is added to iron(ii)sulphide?

which of the following elements has the highest ionization energy?

Which of the following substances can be classified as heavy chemicals?  

Which of the substances is non-polar?

in Boyle's law?

One of the deductions from Rutherford's alpha particle scattering experiment is that?

The number of electrons in the 3d orbital of  \(_24\)Cr is

What is the solubility of a salt X at 25ºC if the saturated solution of the salt contains 0.28g in 100cm\(^3\) of the solution in mol\dm\(^3\)? 

[ X = 56.0g ]

In a mixture of gases which do not react chemically together, the pressure of the individual gas is?

The bleaching action of chlorine is through the process?

Calcium and magnesium belong to the group of the periodic table because both?

Which of the following apparatus is NOT used in volumetric analysis?

If the value of ΔH is positive for a reaction, it means that the reaction is?

The method used to collect gas in the laboratory depends on its?

I. boiling point  II. density  III. smell  IV. solubility in water

Kipps  apparatus can be used to prepare?

When quicklime dissolves in water?

The group to which elements belong in the periodic table is determined by the number?

Which of the following metals reacts slowly with cold water?

The periodic table is an arrangement of elements according to their? 

Which of the following compounds is formed by the oxidation of ethanol?

A sample of air was bubbled into water. The PH of the water slowly changed from 7 to 6. Which of the following gases in the samples caused the change?

An organic compound contains 72% carbon, 12% hydrogen and 16% oxygen by mass. What is the empirical formula of the compound?

[ H = 1.0. C = 12.0, O = 16.0 ]

Which of the following compounds has coordinate bonds in its structure?