Metals and their compounds - Jamb Chemistry Past Questions and Answers

Question 16:

• JAMB 1980

On heating, under suitable conditions, 1 litres of monoatomic gas,X, combines with 1¹/₂ litres of an oxide, What is the formula of the oxide.

A. XO₃
B. X₂O₃
C. X₃O₂
D. XO₂
E. None of the above

Question 17:

• JAMB 1980

Which of the following statements is true?

A. Metals conduct electricity while non-metals do not
B. Metals have high density, non-metals have low density
C. Metals form basic oxides, non-metals form acidic oxides
D. In the electro chemical series, metals are above hydrogen while non-metals are below hydrogen
E. Metals lose elections while non-metals gain electron during normal reactions

Question 18:

• JAMB 1980

Which ONE of the following statements is true?

A. All alkali metals salts dissolves with dissociation in water
B. Most ionic substances are easily vaporized
C. Ionic substances exist only as liquid
D. Non-ionic substances are good electrolytes
E. Nitrogen exists in a trivalent state in ammonium salts

Question 19:

• JAMB 1980

The following arrangement of elements in order of decreasing number of outer electrons; One of the elements is wrongly placed. Which is it? ALUMINIUM, CHLORINE, SILICON, MAGNESIUM AND SODIUM.

A. Chlorine
B. Aluminium
C. Silicon
D. Magnesium
E. Sodium

Question 20:

• JAMB 1980

Which of the following derivatives of nitrogen affords an aqueous solution having a pH of less that 7?

A. N₂O
B. NO
C. NO₂
D. NaNO₃
E. NH₃