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Match List-I with List-II

List-IList-II
(Elements)(Atomic Mass (u))
(A) Oxygen(I) 12
(B) Carbon(II) 23
(C) Calcium(III) 16
(D) Sodium(IV) 40

Choose the correct answer from the options given below:

Solution

✅ Correct Option: 4

Option 1 → Incorrectly matches Oxygen with 12 u (should be 16 u) and Carbon with 23 u (should be 12 u).

Option 2 → Incorrectly matches Oxygen with 23 u and Calcium with 16 u (reversed values).

Option 3 → Incorrectly matches Oxygen with 12 u and Carbon with 16 u (values are swapped).

Option 4 → Correctly matches: Oxygen (16 u), Carbon (12 u), Calcium (40 u), and Sodium (23 u).


Hence, Option 4: (A) - (III), (B) - (I), (C) - (IV), (D) - (II) → These are the standard atomic masses for these elements: Oxygen has atomic mass 16 u, Carbon 12 u, Calcium 40 u, and Sodium 23 u → correct

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