What happens to moist red litmus paper put in a flask containing ammonium gas?
A
Turns blue
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B
Remains red
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C
Turns green
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D
Turns pink
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Solution
The correct option is A Turns blue The moist red paper changes to blue when put in a flask containing ammonium gas. Ammonium gas is basic in nature. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic or alkaline condition.