Jamb Chemistry Past Questions For Year 1991
Question 11
A given quantity of a gas occupies a volume of 228 cm3 at a pressure of 750mm Hg. What will be its volume at atmospheric pressure?
- A. 220 cm3
- B. 225 cm3
- C. 230 cm3
- D. 235 cm3
Question 12
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
Question 13
Which of the following ions is a pollutant in drinking water even in trace amounts?
- A. Ca2+
- B. Hg2+
- C. Mg2+
- D. Fe2+
Question 14
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 15
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
