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Some Basic Concepts of Chemistry question

2023 · Q106
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Some Basic Concepts of Chemistry question

2023 · Q106

NEETChemistrySome Basic Concepts of ChemistryMCQ+4 / −1

The right option for the mass of CO2\mathrm{CO}_{2}CO2​ produced by heating 20 g20 \mathrm{~g}20 g of 20%20 \%20% pure limestone is

(Atomic mass of Ca=40\mathrm{Ca}=40Ca=40 )

[CaCO3⟶1200 KCaO+CO2]\left[\mathrm{CaCO}_{3} \stackrel{1200 \mathrm{~K}}{\longrightarrow} \mathrm{CaO}+\mathrm{CO}_{2}\right][CaCO3​⟶1200 K​CaO+CO2​]

  1. A
    1.76 g
  2. B
    2.64 g
  3. C
    1.32 g
  4. D
    1.12 g
View written solutionFree

Correct answer: A

Weight of impure limestone $=20 \mathrm{~g}$

Weight of pure limestone $$\left(\mathrm{CaCO}_{3}\right)=20 \%$$ of $20 \mathrm{~g}$

$$=\frac{20}{100} \times 20$$

$=4 \mathrm{~g}$

$$\mathrm{n}_{\mathrm{CaCO}_{3}}=\frac{4}{100}=0.04$$

Image

$$\mathrm{n}_{\mathrm{CO}_{2}}=0.04$$

$$\mathrm{W}_{\mathrm{CO}_{2}}=0.04 \times 44$$

$=1.76 \mathrm{~g}$

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