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  9. Q54

PPSC PCS 2025 · Question 54 of 100

For the Assertion (A) and Reason (R) given below, choose the correct alternative from the following: Assertion (A): Stainless steel is considered a highly corrosion-resistant material. Reason (R): It contains chromium which reacts with oxygen in the air to form a protective oxide layer.

Science & Tech

  1. ABoth A and R are true and R is the correct explanation of A.Correct
  2. BBoth A and R are true, but R is not the correct explanation of A.
  3. CA is true, but R is false.
  4. DA is false, but R is true.

Answer: A. Both A and R are true and R is the correct explanation of A.

Explanation

Both are true and the reason explains the assertion: chromium forms a protective oxide layer that makes stainless steel corrosion-resistant.

Source: https://www.nimbusias.com/wp-content/uploads/2025/12/Punjab-PCS-GS-Original-Paper-2025.pdf

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