Jamb Chemistry Past Questions and Answers

Question 2031:

• JAMB 2018

In electrovalency, the oxidation number of the participating metal is always

A. Decreasing
B. Increasing
C. Constant
D. Neutral

Question 2032:

• JAMB 2018

The ionic radii of metals are usually

A. Greater than their atomic radii
B. Unaffected by the charge on the ion
C. The same as their atomic radii
D. Less than their atomic radii

Question 2033:

• JAMB 2018

Calculate the percentage composition of oxygen in calcium trioxocarbonate(IV) [Ca=40, C=12, O=16]

A. 16
B. 48
C. 40
D. 12

Question 2034:

• JAMB 2018

Which of these alloys contains copper?

A. Solder
B. Steel
C. Permallory
D. Bronze

Question 2035:

• JAMB 2018

If the molecular mass of tetraoxosulphate (VI) acid is 98, calculate its vapour density.

A. 196
B. 49
C. 106
D. 82