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Question

CAN ELEMENTS FROM THE PERIODIC TABLE BE DESTROYED. IF YES THEN SAY WHY IT IS SAID THAT WATER WILL DISAPPEAR EVEN IF IT IS MADE OF 2 ATOMS OF HYDROGEN AND 1 ATOM OF OXYGEN. CAN THESE TWO ELEMENTS BE DESTROYED. IF YOU SAY THAT THESE WILL BE SEPARETED THEN WHY IT IS SAID THAT WATER WILL DISAPPEAR?

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Solution

No, elements cannot be destroyed as matter can be converted from one form to another but cannot be destroyed.

Water is made up of Hydrogen and oxygen atoms.When 2 hydrogen atoms and one oxygen atom join, a molecule of water is formed.

When water is evaporated it changes into vapours, mixes with the surrounding air and is not seen.In this way it can be said that water has disappeared from sight but is not destroyed.

Now, when electricity is passed through water, it dissociates into H+ and OH- ions which give H2 at cathode and O2 at anode.Thus, water is broken down into Hydrogen and oxygen molecules which are gases and cannot be seen.So we say, water has disappeared.


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