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20.0 g of a magnesium carbonate sample decomposes on heating to give CO₂ and 8.0 g magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?
Options
(a) 75
(b) 96
(c) 60
(d) 84
Correct Answer:
84
Explanation:
MgCO₃ -> MgO + CO₂
84 g of MgCO₃ form 40 g of MgO
20g of MgCO₃ form (40 * 20) / 84 g of MgO
= 9.52 g of MgO
Since 8 g of MgO is formed, purity = (8 / 9.52) *100 = 84%
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Question Type: Apply
(15)
Difficulty Level: Moderate
(4)
Topics: Basic Concepts of Chemistry
(94)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The equilibrium constant for mutarotation α-D Glucose ⇌ β-D Glucose is 1.8.
- Water is oxidised to oxygen by
- If Ksp for HgSO₄ is 6.4 x 10⁻⁵, then solubility of the salt is
- What is the mole fraction of the solute in a 1.00 m aqueous solution?
- Which of the following is diamagnetic
Question Type: Apply (15)
Difficulty Level: Moderate (4)
Topics: Basic Concepts of Chemistry (94)
Subject: Chemistry (2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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