Q10 / 160 · TS EAMCET 2018 (04 May Shift 1) · Chemistry

When 10 g of 90% pure limestone is heated, the approximate volume (in L) of CO2 liberated at STP is:

  • A
    4.4
  • Correct answer
    B
    2.0
  • C
    4.0
  • D
    22.4

Solution

The decomposition reaction of CaCO3 is,

CaCO3 (s)⟶∆CaO(s)+CO2 (g)

At STP, heating 1 mole of CaCO3 (i.e., 100 g) liberates 1 mole or 22.4 L of CO2.

10 g of 90% pure limestone=10×90100

=9 g of pure CaCO3.

Since, 100 g→22.4 L

Therefore, 9 g of CaCO3 will liberate

=9×22.4100L

=2.0 L CO2

Hence, the correct answer is option: 'B'.

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