Question

(i) state your observation when electric current is passed through acidulated water contained in voltmeter such that the electrode has been covered by a test tube containing water.


(ii) How will you test the gas evolved?

Answer 1

Explanation:

1) (a) Tiny bubbles of colourless gas is formed on each electrode.

   (b) these bubbles of colourless gas rise up in the test tubes. they collect in the form of colourless gases and in doing so displaces the water in the downward direction.

2) The gas which collects at cathode is hydrogen. it can be tested as follows:

Lighting a candle

wooden splint

Answer 2

Answer: it will be broken down into hydrogen and oxygen ions.

2H2O => 2H2 + O2