Carbon tetrachloride fire extinguisher should not be used in
closed rooms, because it produces a poisonous gas called
1 Carbon monoxide
2 Phosphine
3 Phosgene
4 None of these
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Papepr is manufactured by 1 Wod and resin 2 Wood, sodium and bleaching powder 3 Wood and bleaching powder 4 Wood, calcium, hydrogen sulphite and resin
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Heavy water is 1 Sea water (H2O+Salt) 2 D2O 3 H2O2 4 None of these
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Soda-acid fire extinguisher involves the reaction between 1 Sodium hydroxide and nitric acid 2 Sodium bi carbonate and sulphuric acid 3 Sodium sulphate and carbonic acid 4 Sodium carbonate and hydrochloric acid
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