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ChemistryJEE Main 28 Jan 2026, Shift 2·Q18·MCQ·Moderate

Some Basic Concepts · Limiting reagent with mass percent solution

For the given reaction;

CaCOX3+2 HCl→CaClX2+HX2O+COX2\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}

If 90 g CaCOX3\ce{CaCO3} is added to 300 mL of HCl which contains 38.55% HCl by mass and has density 1.13 g mL−1^{-1}, then which of the following option is correct?

Given molar mass of H, Cl, Ca and O are 1, 35.5, 40 and 16 g mol−1^{-1} respectively.

  1. (1)64.97 g of HCl remains unreacted
  2. (2)32.85 g of CaCOX3\ce{CaCO3} remains unreacted
  3. (3)97.30 g of HCl reacted
  4. (4)60.32 g of HCl remains unreacted
We corrected a printing error in the original paper

Source printed “CaCO3_3 + 2HC1” (digit 1 for l) and, in option (4), “reamains”.

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See the full 28 Jan 2026, Shift 2 paper