Question 686:

• JAMB 1991

Which of the following represents the type of bonding present in ammonium chloride molecule?

A. Ionic only
B. Covalent only
C. Ionic and dative covalent
D. Dative covalent only

Question 687:

• JAMB 1991

Which of the following is arranged in order of increasing electronegativity?

A. Chlorine, aluminium, magnesium, phosphorus, sodium
B. Sodium, magnesium, aluminium, phosphorus, chlorine
C. Chlorine, phosphorus, phosphorous, aluminium, magnesium, sodium
D. Sodium, chlorine, phosphorus, magnesium, aluminium

Question 688:

• JAMB 1991

A quantity of air was passed through a weighed amount of alkaline pyrogallol. An increase in the weight of the pyrogallol would result from the absorption of?

A. Nitrogen
B. Neon
C. Argon
D. Oxygen

Question 689:

• JAMB 1991

Which of the following ions is a pollutant in drinking water even in trace amounts?

A. Ca²⁺
B. Hg²⁺
C. Mg²⁺
D. Fe²⁺

Question 690:

• JAMB 1991

The solubility of copper (II) tetraoxosulphate (Iv) is 75g in 100g of water at 100°C and 25g in 100g of water at 30°C. What mass of the salt would crystallize, if 50g of copper (II) tetraoxosulphate (VI) solution saturated at 100°C were cooled to 30°C ?

A. 57.5
B. 42.2
C. 28.6
D. 14.3