Which of the following is not a property of hydrogen?
A
It is a colourless, odorless gas
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B
It is highly combustible
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C
It is highly poisonous gas
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D
It is lighter than air
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Solution
The correct option is A It is highly poisonous gas Hydrogen is a non-poisonous gas. Hydrogen is a colourless, odorless gas. It is highly combustible. It is lighter than air.