Atomic structure and bonding - Jamb Chemistry Past Questions and Answers

Question 136:

• JAMB 2009

If an atom is represented as \( _{11}^{23}X \), which of the following deduction is correct?

A. It contains 12 protonic
B. It forms a covalent chloride
C. Its atomic number is 23
D. It is an alkali metal

Question 137:

• JAMB 2009

Cathode rays causes an object placed behind a perforated anode to cast a shadow on the screen. This observation shows that the rays

A. Are positively charged
B. Are negatively charged
C. Have mass
D. Travel in straight lines

Question 138:

• JAMB 2009

The type of bonding in {Cu(NH₃)₄}²⁺ is

A. Coordinate
B. Electrovalent
C. Metallic
D. Covalent

Question 139:

• JAMB 2009

The colour changes observed when testing for reducing agents using acidified potassium heptaoxodichromate (IV) solution is

A. Yellow to purple
B. Orange to green
C. Green to orange
D. Purple to yellow

Question 140:

• JAMB 2010

Moving from left to right across a period, the general rise in the first ionization energy can be attributed to the

A. Decrease in nuclear charge
B. Increase in nuclear charge
C. Decrease in screening effect
D. Increase in screening effect