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NEETChemistryChemical Equilibrium

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): For the equilibrium CaCO ₃( s ) CaO( s ) + CO ₂( g ) , increasing the pressure at equilibrium decreases the amount of CaO ( s ) present. Reason (R): According to Le Chatelier's principle, an increase in pressure shifts the equilibrium towards the direction having fewer moles of gaseous substances.

Options

  1. ABoth Assertion and Reason are true and Reason is the correct explanation of Assertion
  2. BBoth Assertion and Reason are true but Reason is not the correct explanation of Assertion
  3. CAssertion is true but Reason is false
  4. DAssertion is false but Reason is true

Correct answer

A. Both Assertion and Reason are true and Reason is the correct explanation of Assertion

Step-by-step solution

Assertion (A) is true. In the given heterogeneous equilibrium, CaCO ₃( s ) CaO ( s ) + CO ₂( g ) , the number of gaseous moles on the reactant side is 0 and on the product side is 1 . When pressure is increased, the equilibrium shifts in the direction that reduces the pressure, which is the direction with fewer moles of gaseous substances (backward direction). This backward shift consumes CaO ( s ) and CO ₂( g ) to form more CaCO ₃( s ) , thereby decreasing the amount of CaO ( s ) present. Reason (R) is true and is

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