Question

Which of the following is true for the compound AB, if it is formed by the transfer of an electron from A to B?

• A. B is divalent
• B. A is divalent
• C. AB forms electrovalent bond
• D. AB forms covalent bond

Hint:

Electrovalent (ionic) bonds form when electrons are transferred from one atom to another, creating oppositely charged ions that are held together by electrostatic attraction.

Answer 1

The Correct Option is C

Step 1: Understanding the type of bond formed.
When an electron is transferred from one atom to another, the resulting bond is ionic (or electrovalent). This happens when a metal atom loses an electron, becoming a cation, and a non-metal atom gains that electron, becoming an anion. The electrostatic attraction between the oppositely charged ions forms the ionic bond.

Step 2: Analyzing the options.
(A) B is divalent: This is not necessarily true. The oxidation state of B depends on the specific electron transfer and the nature of the compound.
(B) A is divalent: Similarly, this is not always true. The oxidation state of A depends on the reaction.
(C) AB forms electrovalent bond: Correct — The transfer of an electron leads to the formation of an ionic (electrovalent) bond between A and B.
(D) AB forms covalent bond: This is incorrect. A covalent bond forms when atoms share electrons, not when electrons are transferred.

Step 3: Conclusion.
The correct answer is (C) AB forms electrovalent bond.