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CTET 2 Math and Science Sep 2015 Paper

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Question : 88

Total: 120

Anita prepared a fresh solution of sodium hydroxide in a test tube. She dropped a small piece of aluminium foil into it and then brought a burning matchstick near the mouth of the test tube. She hears a pop sound. The pop sound indicates the presence of:

Oxygen gas
Hydrogen gas
Aluminium gas
Water gas

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