Jamb Chemistry 2019 Past Questions and Answers

Question 81:

• JAMB 2019

Elements X and Y have electronic configurations 1s\(^2\)2s\(^2\)2p\(^4\) and 1s\(^2\)2s\(^2\)2p\(^6\)3s\(^2\)3p\(^1\) respectively. When they combine, the formula of the compound formed is

A. XY
B. X\(_2\)Y
C. Y\(_2\)X\(_3\)
D. X\(_2\)Y\(_3\)

Question 82:

• JAMB 2019

By what amount must the temperature of 200cm\(^3\) of Nitrogen at 27°C be increased to double the pressure if the final volume is 150cm\(^3\) (Assume ideality)

A. 150°C
B. 177°C
C. 75°C
D. 120°C

Question 83:

• JAMB 2019

The combustion of carbon(ii)oxide in oxygen can be represented by equation.
2CO + O\(_2\) → 2CO\(_2\)
Calculate the volume of the resulting mixture at the end of the reaction if 50cm\(_3\) of carbon(ii)oxide was exploded in 100cm\(_3\) of oxygen

A. 75cm\(^3\)
B. 125cm\(^3\)
C. 100cm\(^3\)
D. 50cm\(^3\)

Question 84:

• JAMB 2019

When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

A. Electrovalent bond
B. Co-ordinate bond
C. Ionic bond
D. Covalent bond

Question 85:

• JAMB 2019

Which of the following represents the kind of bonding present in ammonium chloride?

A. Ionic only
B. Covalent only
C. Ionic and dative covalent
D. Dative covalent