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UPSSSC PETQuestion 9 of 10 · Chemistry in Everyday Life
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UPSSSC PET 2023 (29 Oct Shift 2)

By releasing excessive dry powder of which chemical near the fire gives off ?

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Answer: Option D — Sodium Bicarbonate

Detailed Solution

Dry powder extinguishers contain sodium bicarbonate, which breaks down in the heat of the fire to give : .

This cuts the fire off from oxygen; calcium carbonate needs far more heat to decompose and the other two give no .

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Chemistry in Everyday Life — UPSSSC PET Preparation

This question tests your understanding of Chemistry in Everyday Life, a key topic in the UPSSSC PET General Knowledge section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.

This topic covers chemistry in daily life: fuels and their calorific values, fertilisers, cement and glass, medicines such as antibiotics and analgesics, food preservatives and additives, cleaning agents, fire extinguishers, and the chemistry of the environment. Questions usually ask about the main component of a fuel (LPG is mainly butane and propane, and CNG is mainly methane), which gas is used in fire extinguishers (carbon dioxide), and what a medicine or chemical is used for. Read the explanation for each question carefully, since one fact is often tested in several ways. Practise the chemistry in everyday life questions below, written in the style of the general awareness sections of exams such as SSC, banking, railways, CUET GAT, MAH CET and CLAT. Each question comes with a detailed explanation that adds related facts, so every question helps you revise more than one point.

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