SSC CPO SI and ASI Model Paper 2

Question : 93 of 200

Marks: +1, -0

When we add aluminium foil to freshly prepared sodium hydroxide solution, a gas is produced. Which of the following correctly states the property of this gas?

Colourless and odourless gas that extinguishes a burning match stick
Colourless and odourless gas that promotes burning of a candle
Brown coloured pungent smelling gas
Colourless and odourless gas that produces a ‘pop’ sound when a burning match stick is brought near it

Validate

Solution:

(4) Aluminium metal reacts withsodium hydroxide to produce hydrogengas. The reaction that takesplace is as the following.

2 Al + 2 NaOH + 6 H_2O→↖{Heat}2 NaAl(OH)_4 + 3 H_2

Hydrogen gas produced in the reactionburns with a pop sound when aburning matchstick is brought nearit.

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