Basic Concepts| First Year Chemistry | Past MCQs | mosaicbro.com

Basic Concepts| First Year Chemistry | Past MCQs

7 of 41 questions (Page 2 of 6)

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8 Percentage of oxygen in water is:
Correct Answer: B
Explanation: (16/18) × 100 = 88.89%.
9 A limiting reactant is one which:
Correct Answer: D
Explanation: Limiting reactant determines the theoretical yield of the product.
10 Tin has isotopes:
Correct Answer: C
Explanation: Tin (Sn) has 11 stable isotopes.
11 Empirical formula of glucose is:
Correct Answer: C
Explanation: Glucose (C₆H₁₂O₆) simplifies to CH₂O as the empirical formula.
12 The mass of CO₂ containing 8 grams of oxygen (O₂) in grams is:
Correct Answer: D
Explanation: 8 g O₂ = 0.25 moles O₂ → 0.25 moles CO₂ = 11 g (0.25 × 44).
13 1 amu is equal to:
Correct Answer: D
Explanation: 1 amu = 1.661 × 10⁻²⁴ g (or 1.661 × 10⁻²⁷ kg).
14 Cadmium has isotopes:
Correct Answer: A
Explanation: Cadmium has 9 naturally occurring isotopes.
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