Jamb Chemistry Past Questions For Year 1999

Question 11

Which of the following will have its mass increased when heated in air?

jamb 1999

• A. Helium
• B. Magnesium
• C. Copper pyrites
• D. Glass

Question 12

Which is the temperature of a given mass of a gas initially at 0°C and 9 atm, if the pressure is reduced to 3 atm at constant volume?

jamb 1999

• A. 91K
• B. 182K
• C. 273K
• D. 819K

Question 13

Which of the following gases will diffuse fastest when passed through a porous plug?

[H = 1, C = 12, N = 14, O = 16]

jamb 1999

• A. Propane
• B. Oxygen
• C. Methane
• D. Ammonia

Question 14

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s²

An element with the electronic configuration above is a

jamb 1999

• A. non-metal
• B. metal
• C. transition element
• D. group two element

Question 15

The method that can be used to convert hard water to soft water is

jamb 1999

• A. chlorination
• B. passage over activated charcoal
• C. the use of an ion-exchange resin
• D. aeration