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UP POLICE SIUP POLICE SI Hard Mock Set 4Hard GK

UP POLICE SI Mock Test Set 4, Q29: Identify the correct answer for gas used in many electrical fire extinguishers.

A. Nitrogen dioxide
B. Carbon dioxide
C. Hydrogen
D. Oxygen
Correct Answer: B. Carbon dioxide
Explanation: CO2 does not support combustion. Category: UP POLICE SI. Set: 4.
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