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Baking soda has the chemical formula
A$Na_2CO_3$
B$NaHCO_3$
C$NaOH$
D$NaCl$
Answer & Solution
Correct answer: B. $NaHCO_3$
1. Baking soda is sodium hydrogencarbonate, **$NaHCO_3$**.
2. On heating it gives $Na_2CO_3 + H_2O + CO_2$; the CO₂ makes cakes rise.
3. $Na_2CO_3$ is washing soda; NaOH is caustic soda.
_Source: Karnataka SSLC (KSEEB) Class 10 Science, Ch2 'Acids, Bases and Salts', §2.4_
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