Jamb Chemistry 2019 Past Questions and Answers

Question 51:

• JAMB 2019

In order to remove one electron from a 3S orbital of gaseous sodium atom, about 496KJMol^-1 of energy is required. This energy is referred to as

A. Electron affinity
B. Ionization energy
C. Activation evergy
D. Electronegativity

Question 52:

• JAMB 2019

Nitrogen obtained from the liquefaction of air has a higher density than that obtained from nitrogen containing compounds because the former contains

A. Water vapour
B. Oxygen
C. Carbon (IV) oxide
D. Rare gases

Question 53:

• JAMB 2019

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

A. Chlorination
B. Passage over activated charcoal
C. The use of an ion-exchange resin
D. Aeration

Question 54:

• JAMB 2019

1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁷, 4s²
An element with the electronic configuration above is a

A. Non-metal
B. Metal
C. Transition element
D. Group two element

Question 55:

• JAMB 2019

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?

A. HF_(g)
B. NH_3(g)
C. Ch_4(g)
D. HCl_(g)