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Q.

Once in a village, there was a fire in a hut. When a lot of dry powder of a substance 'A' was released over the fire, the fire got extinguished. What among the following is substance A?

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a

Sodium Chloride

b

Sodium hydrogen carbonate

c

Sodium sulfate

d

Potassium chloride

answer is B.

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Detailed Solution

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The fire gets extinguished when sodium hydrogen carbonate was released over the fire.
When sodium hydrogen carbonate or sodium bicarbonate (baking soda) is released in the form of dry powder over the fire, the heat of the fire releases carbon dioxide from the baking soda, and the produced carbon dioxide extinguishes the fire.
Sodium bicarbonate is the main component used in fire extinguishers.

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Once in a village, there was a fire in a hut. When a lot of dry powder of a substance 'A' was released over the fire, the fire got extinguished. What among the following is substance A?