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MODEL PAPER 8 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 81 Mark
MCQ
The compounds used to prepare $NaHCO _3$ are:
  • A
    $Na _2 CO _3, CO _2, H _2 O , O _2$
  • B
    $NaCl , NH _3, CO _2, H _2 O$
  • C
    $NaCl , NaOH , CO _2, H _2 O$
  • D
    $NaCl , Ca ( OH )_2, H _2 O , CO _2$
✓

Answer

(a) $Na _2 CO _3, CO _2, H _2 O , O _2$
Explanation: The reaction between sodium carbonate $\left( Na _2 CO _3\right)$ and carbon dioxide $\left( CO _2\right)$ in the presence of water. Here's the balanced chemical equation for this reaction:
$Na _2 CO _3+ CO _2+ H _2 O \rightarrow 2 NaHCO _3$

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