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Chemical Reactions and Equations — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceChemical Reactions and Equations1 Mark
MCQ
Complete the missing components/ variables given as $x$ in the following reactions : $\text{CaCO}_3​(\text{s})\xrightarrow{\text{x}}\text{​CaO}(\text{s})+\text{CO}_2​(\text{g})$
  • ✓
    $x =$ Heat
  • B
    $x =$ Catalyst
  • C
    $x = O2​$
  • D
    None of these
✓

Answer

Correct option: A.
$x =$ Heat
Calcium carbonate on heating decomposes to form calcium oxide $($quick lime$)$ and carbon dioxide.
The equation for this thermal decomposition reaction can be written as:
$\text{CaCO}_3​\xrightarrow{\text{heat}}\text{CaO}+\text{CO}_2​$
Therefore $,x$ in the above reaction is heat.

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