ASSERTION: Metals like Na, K, Ca and Mg are never found in their free state in nature.

REASON: Metals are very reactive elements, so they combine with other non-metals to complete their octet.

Metals like Na, K, Ca and Mg are never found in their free state in nature.

• A. both assertion and reason are correct and reason is the correct explanation for assertion.
• B. both assertion and reason are correct and reason is not the correct explanation for assertion.
• C. assertion is correct but reason is incorrect.
• D. both assertion and reason are incorrect.

The statement discusses the occurrence of certain metals in nature and their reactivity. Let's break it down:

Assertion Analysis

The assertion claims that metals like sodium (Na), potassium (K), calcium (Ca), and magnesium (Mg) are never found in their free state in nature. This is true, as these metals are highly reactive and tend to form compounds with other elements.

Reason Examination

The reason provided states that these metals are very reactive and combine with non-metals to complete their octet. This is also accurate, as their reactivity leads them to bond with non-metals, preventing them from existing in a pure form.

Connecting the Dots

Since both the assertion and the reason are correct, and the reason explains why the assertion is true, the correct choice is:

A. both assertion and reason are correct and reason is the correct explanation for assertion.