227 – To increase the cleaning power of detergents, which substance is better to add? (1) Magnesium chloride (2) Calcium hydroxide (3) Sodium hydrogen carbonate (4) Aluminum hydroxide
\textbf{227 –} To increase the cleaning power of detergents, which substance is better to add?
(1) Magnesium chloride \hfill (2) Calcium hydroxide
(3) Sodium hydrogen carbonate \hfill (4) Aluminum hydroxide
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