Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 161:

• JAMB 2019

Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with

A. Pb
B. Zn
C. Ca
D. Na

Question 162:

• JAMB 2019

SO\(_3\) is not directly dissolved in water in the industrial preparation of H\(_2\)SO\(_4\) by the contact process because

A. SO\(_3\) is an acidic gas
B. Acid is usually added to water and not water to acid
C. The reaction between SO\(_3\) and water is violently exothermic
D. SO\(_3\) does not dissolve readily in water

Question 163:

• JAMB 2019

Which two gases can be used for the demonstration of the fountain experiment?

A. SO\(_3\) and NH\(_3\)
B. SO\(_2\) and NH\(_3\)
C. HCl and NH\(_3\)
D. SO\(_2\) and HCl

Question 164:

• JAMB 2020

The best treatment for a student who accidentally poured conc tetraoxosulphate(vi) on his skin in the laboratory is to wash his skin with?

A. With cool running water
B. Sodium hydroxide solution
C. Iodine solution
D. Sodium trioxonitrate(v) solution

Question 165:

• JAMB 2020

When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?

A. Bipolar
B. Negatively charged
C. Positively charged
D. Neutral