Water As A Product Of The Combustion Of Hydrogen And Its Composition By Volume - Chemistry Jamb Past Questions and Answers

Question 1 :

• JAMB 1978

A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because

A. Pressure inside the gas jar is greater than pressure outside it
B. The air in the gas jar had been used up by burning
C. Oxygen in the gas jar had been used up by burning
D. Nitrogen in the gas jar had been used up by burning
E. The temperature in the jar had risen considerably

Question 2 :

• JAMB 2018

Which of these sources of water may likely contain the least concentration of Ca\(^{2+}\) and Mg\(^{2+}\)?

A. Spring water
B. River water
C. Tap water
D. Sea water