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Question

Choose the correct statement(s).


A

Pure water changes the colour of blue litmus to red.

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B

Pure water changes the colour of red litmus to blue.

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C

Water has dissolved oxygen.

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D

Electrolysis of water produces hydrogen and oxygen.

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Solution

The correct options are
C

Water has dissolved oxygen.


D

Electrolysis of water produces hydrogen and oxygen.


Pure water is neutral to litmus and does not change the colour of blue litmus or red litmus solution.

Water does react with metals like platinum, gold, copper, silver.
Water has dissolved gases like oxygen, which makes aquatic life possible.

Electrolysis of water gives hydrogen and oxygen.

2H2O(l) electric current−−−−−−−−−−− 2H2(g)+O2(g)


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