Q143 / 270 · NDA 2020 · General Ability

At nearly $70^{\circ} \mathrm{C}$, sodium bicarbonate shows the property of gradually decomposing, which makes it usable in bakery products. The product of decomposition responsible for this use of sodium bicarbonate is

  • Correct answer
    A
    Carbon dioxide
  • B
    Hydrogen
  • C
    Water vapour
  • D
    Oxygen

Solution

Above $70^{\circ} \mathrm{C}$, sodium bicarbonate gradually decomposes into sodium carbonate, water and carbon dioxide as follows $-2 \mathrm{NaHCO}_3-\mathrm{Na}_2 \mathrm{CO}_3+\mathrm{H}_2 \mathrm{O}+\mathrm{CO}_2$, In bakery, it reacts with other components or decomposes at higher temperature to release carbon dioxide, which causes dough to rise.

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

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