Question

In order to carry out the decomposition reaction of water, a student passes electric current from a battery through water containing a few drops of dilute sulphuric acid. In this process, two volume of gas X are collected in a test tube inverted over cathode (negative electrode) whereas one volume of gas Y is collected in the test tube inverted over anode ( positive electrode).

a) Why do we add a few drops of dil. sulphuric acid to water before passing electric current?

b) Name the gas X.

c) Name the gas Y.
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Answer 1

A) hydrogen or oxygen

B) when compound water (hydro oxide) h2o breaks apart it creates twice the volume of hydrogen and oxygen

2H2O--------------2 H2 +1 O2

C) h2so4 increase conductivity of water so it can produce at reasonably fast pace. Production of H2 and o2 would be awfuly slow.

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Answer 2

a) to ease flow of current

b)Hydrogen

c) oxygen