While demonstrating an experiment to show whether water conducts electricity or not, teacher added a teaspoonful of salt to water in a beaker and immersed two electrodes in it.The electrodes were connected to the terminals of the battery. Students observed evolution of gas bubbles near the electrodes.(1+1+1+2)
a) Why did the teacher add teaspoonful salt to water?
b) Name the electrode connected to the positive and negative terminal of the battery.
c) Name the gas evolved at the electrodes connected to positive and negative terminals of the battery.
d) Is the change taking place in the solution a physical change or a chemical change.Explain?
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