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69. The elements which are very abundant in earth crust are

September 17, 2025 by Admin

A. Si & AI

B. Ca & Mg

C. B & AI

D. All

✅ The correct answer is option A.

Categories Chemistry, S-Block Elements MCQs Tags Chemistry MCQs, S-Block Elements MCQs

66. The formula of Chile saltpetre is

72. The oxides of beryllium BeO is

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