If the relative molecular mass of an element is not a whole number, it can be deduced that the element is

A. naturally radioactive

B. abundant in nature

C. a transition metal

D. an isotopic mixture

The atomic number of chlorine is 17. What is the number of electrons in a chloride ion?

A. 16

B. 17

C. 18

D. 19

Consider the following equation; Cr₂O_7(aq)^2- + 14H⁺_(aq) + 6e^- → 2Cr³⁺_(aq) + 7H₂O_(I). The oxidation number of chromium changes from

A. -2 to + 3

B. - 2 to + 6

C. + 6 to + 3

D. + 7 to + 6

Which of the following ions require the largest quantity of electricity for discharge at an electrode?

A. 2.0 mole of Q ³⁺

B. 2.5 mole of R²⁺

C. 4.0 mole of Y^-

D. 3.0 mole of T^{- View Answer & Discuss WAEC 2002}

If two metallic ions of the same concentration migrate to a graphite cathode, the one that would be preferentially discharged is the one that has the

A. smaller mass

B. lower electrical charge

C. greater stability in solution

D. stronger tendency to accept electrons

When concentrated sodium chloride solution is electrolysed using inert electrodes the products are?

A. oxygen and hydrogen

B. hydrogen and oxygen

C. sodium and oxygen

D. soduim hydroxide, hydrogen and chlorine

Which of the following processes takes place during the production of margarine from vegetable oils?

A. Esterification

B. Hydrolysis

C. Hydrogenation

D. Saponification

Which of the following compounds can be represented by the molecular formula C₂H₆O?

A. Propanel

B. Ethanol

C. Methanoic acid

D. Glucose

When alkynes are hydrogenated completely, they produce compounds with the general molecular formula

A. C _nH _n

B. C _nH _2n+2

C. C_nH _2n

D. C_nH_2n-2

The following compounds are hydrocarbons except

A. methylpropanoate

B. 2-methylbutane

C. benzene

D. cyclohexane

Which of the following statements about soapless detergents is correct? They

A. lather readily with hard water

B. increase the surface tension of water

C. cause hydrolysis of salts in water

D. from a curdy precipitate with soft water