Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 31:

• JAMB 1983

The flame used by welders in cutting metals is

A. Butane gas flame
B. Acetylene flame
C. Kerosene flame
D. Oxy-acetylene flame
E. Oxygen flame

Question 32:

• JAMB 1983

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

Question 33:

• JAMB 1983

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

Question 34:

• JAMB 1983

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)

Question 35:

• JAMB 1984

Which of the following methods may be used to prepare trioxonitrate (V) acid (nitric acid) in the laboratory?

A. Heating ammonia gas with tetraoxosulphate (VI) acid
B. Heating ammonium trioxonitrate (V) with tetraoxosulphate (VI) acid
C. Heating sodium trioxonitrate (V) with tetraoxosulphate (VI) acid
D. Heating potassium trioxonitrate (V) with calcium hydroxide
E. Heating a mixture of ammonia gas and oxygen.