SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 41

####41. $20.0 g$ of a magnesium carbonate sample decomposes on heating to give carbon dioxide and $8.0 g$ magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample?

(a) 75

(b) 96

(d) 84

[2015 RS]

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Solution:

(d) $M g C O_{3} ⟶ M g O + C O_{2}$

$84 g$ of $M g C O_{3}$ form $40 g$ of $M g O$

$∴ 20 g$ of $M g C O_{3}$ form $\frac{40 \times 20}{84} g$ of $M g O$

$= 9.52 g$ of $M g O$

Since $8.0 g$ of $M g O$ is formed

Purity of sample $= \frac{8}{9.52} \times 100 = 84.0$

Some Basic Concepts of Chemistry - Result Question 41

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Some Basic Concepts of Chemistry - Result Question 41

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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