Which of the following when passes through the alkaline solution of the pyrogalol then ground nut coloured solution is formed?

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Question:Which of the following when passes through the alkaline solution of the pyrogalol then ground nut coloured solution is formed?

1.Oxygen

2.Nitrogen

3.Hydrogen

4.Carbon dioxide

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  1. Which of the following when passes through the alkaline solution of the pyrogalol then ground nut coloured solution is formed?
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