500 g impure sample of CaCO 3 on heating gives 70 g of CaO . Percentage impurities in sample is

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Question: Answered & Verified by Expert

500 g

impure sample of

{CaCO}_{3}

on heating gives

70 g

of

CaO .

Percentage impurities in sample is

ChemistrySome Basic Concepts of ChemistryJEE Main

Options:

A 25%
B 50%
C 75%
D 80%

Solution:

2624 Upvotes Verified Answer

The correct answer is: 75%

C a C O_{3} \to C a O + C O_{2}

Let the % purity is

x

Mol:

\frac{500 \times X}{100 \times 100}

mol

\frac{500 \times X}{100 \times 100} \times 56 = 70

X = 25

% Impurities

= 100 - 25 = 75 %

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