Which of the following happens during the electrolysis of molten sodium chloride?

A. Sodium ion loses an electron

B. Chlorine atom gains an electron

C. Chlorine ion gains an electron

D. Sodium ion is oxidized

E. Chloride ion is oxidized

Crude petroleum pollutant usually seen on some Nigerian creeks and waterways can be dispersed or removed by

A. heating the affected parts in order to boil off the petroleum

B. mechanically stirring to dissolve the petroleum in water

C. pouring organic solvents to dissolve the petroleum

D. spraying the water with stergents

E. cooling to freeze out the petroleum

An element is electronegative if

A. it has a tendency to exist in the gaseous from

B. its ions dissolve readily in water

C. it has a tendency to lose electrons

D. it has a tendency to gain electrons

E. it readily froms covalent bonds

Solutions X, Y, and Z have PH values 3.0. 5. 0 and 9. 0 respectively. Which of the following statements is correct?

A. All the solutions are acidic

B. All the solutions are basic

C. Y and Z are more acidic than water

D. Y is more acidic than X

E. Z is the least acidic

In the reactions

(I) H₂ (g) + 1/2O₂(g) → H₂O(l); ∆H = -286 KJ

(II) C(s) + O₂g) → CO₂ (g); ∆H = -406 KJ the equations imply that

A. more heat is absorbed in (l)

B. more heat is absorbed in (ll)

C. less heat is evolved in (l)

D. reaction (ll) proceeds faster than (l)

E. reaction (l) proceeds faster than (ll)

Which of these metals, Mg, Fe, Pb and Cu will dissolve in dilute HCI?

A. All the metals

B. Mg ,Fe and Cu

C. Mg, Fe and Pb

D. Mg and Fe only

E. Mg only

Stainless steel is an alloy of

A. carbon, iron and lead

B. carbon, iron and chromium

C. carbon, iron and copper

D. carbon, iron and silver

E. carbon and iron only

Which volume of 0.5 M H ₂SO₄ will exactly neutralize 20 cm ³ of 0.1 M NaOH solution?

A. 2.0 cm ³

B. 5.0 cm ³

C. 6.8 cm ³

D. 8.3 cm ³

E. 10.4 cm ³

Which of the following pair of gases will NOT react further with oxygen at a temperature between 30^oC AND 400^oC

A. SO₂ and NH₃

B. CO₂ and H₂

C. NO₂ and SO₃

D. SO₃ and NO

E. CO and H₂

Some metals are extracted from their ores after some preliminary treatments by electrolysis (L), some of both processes (TL). Which set-up in the following for the extraction of ion, copper and aluminium is correct?

A. lron (L), copper (L) aluminium (T)

B. lron (T) copper (L) aluminium (T)

C. lron (TL) copper (TL) aluminium (TL)

D. Iron (L) copper (T) aluminium (T)

E. lron (T) copper (L), aluminium (TL)