Soda water contains ¾.

ক. carbon dioxide

খ. carbonic acid

গ. nitrous acid

ঘ. sulphuric acid

উত্তর: carbon dioxide

ব্যাখ্যা: Soda water primarily contains carbon dioxide gas, which is dissolved under pressure to create its fizziness. A small amount of this dissolved carbon dioxide then reacts with water to form carbonic acid, contributing to the drink's slightly acidic taste.

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