####24. Washing soda has formula
(a) $Na_2 CO_3 \cdot 7 H_2 O$
(c) $Na_2 CO_3 \cdot 3 H_2 O$
(b) $Na_2 CO_3 \cdot 10 H_2 O$
(d) $Na_2 CO_3$
[1990]
Topic 3: Preparation and Properties of Alkaline Earth Metals and their Compounds
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