Dry powder fire extinguishers contain
1). sand
2). sand and sodium carbonate
3). sand and potassium carbonate
4). sand and sodium bicarbonate
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1. Nitric acid does not react with
2. The chemical name of Common salt is
3. At room temperature, the metal that remains liquid is:
7. The heat energy produced when the human body metabolises 1 gram of fat is
8. The Chemical formula of Ammonium sulphate is