railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

Which of the following chemical compounds is used as a disinfectant, a refrigerant, a reducing and bleaching agent, and a food preservative, especially in dried fruits?

1
Potassium hydroxide
2
Copper sulphate
3
Sodium bicarbonate
4
Sulfur dioxide
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