Chemistry Class 10 Chapter 15 Important MCQs Federal Board Chemistry Important MCQs Class 10 Chapter 15 Environmental Chemistry 2 MCQ’S 1. It has been estimated that the total amount of water present on earth is about ____ cubic kilometers. A.1.33 Billion B.1.33 Million C.1.33 Trillion D. None of them Answer: A (1.33 Billion) 2. Water …
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Chemistry Class 10 Chapter 14 Important MCQs 10th Chemistry Federal Board Chapter 14 The Atmosphere Fbise 1. Dry air consists of __ % Oxygen by volume. A.78 B.21 C.4 D.0.05 ANSWER: B (21%) 2. The % of Hydrogen in dry air is __. A.0.00005 B.0.70 C.0.98 D.1.7 ANSWER: A (0.0005%) 3. The air may contain …
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