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SSC CPO 2022 PYQ — Question 64

SSC CPO - 9 Nov 2022 - Shift 3 • General Awareness • Q64

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Which of the following pair of compound name – formula is correct?

I. Calcium oxide – Ca2O

II. Aluminum Oxide – Al2O3

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Correct answer: D

Explanation

The correct answer is option 4 i.e. Only II.

Let's evaluate each pair:

  1. Calcium oxide – Ca₂O: Incorrect: The correct formula for calcium oxide is CaO. Calcium forms a +2 charge, and oxygen forms a -2 charge, resulting in a 1:1 ratio.

  2. Aluminum oxide – Al₂O₃: Correct: The formula for aluminum oxide is indeed Al₂O₃. Aluminum has a +3 charge and oxygen has a -2 charge, requiring two aluminum atoms for every three oxygen atoms to balance the charges.

Thus, the correct pair is II. Aluminum Oxide – Al₂O₃.