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The more commonly used baking powder contains about \( 30 \% \mathrm{NaHCO}_{3}, 20 \% \mathrm{NaAl}_{4}\left(\mathrm{SO}_{4}\right)_{2} \), \( 10 \% \mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \) and \( 40 \% \) starch. Which of the following statements is/are correct?
(a) \( \mathrm{Ca}\left(\mathrm{H}_{2} \mathrm{PO}_{4}\right)_{2} \) is acidic and when moistened it reacts with \( \mathrm{NaHCO}_{3} \) evolving \( \mathrm{CO}_{2} \) gas.
(b) \( \mathrm{NaAl}\left(\mathrm{SO}_{4}\right)_{2} \) slows down the decomposition reaction of \( \mathrm{NaHCO}_{3} \) so that \( \mathrm{CO}_{2} \) is evolved
\( \mathrm{P} \) more slowly.
(c) \( \mathrm{NaAl}\left(\mathrm{SO}_{4}\right)_{2} \) is acidic and when moistened it reacts with \( \mathrm{NaHCO}_{3} \) evolving \( \mathrm{CO}_{2} \).
(d) Both (a) and (b)
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