Question 7.
Water decomposes into hydrogen and oxvgen during electrolysis. A sample of water is electrolysed.
The hydrogen and oxygen are collected separately. After ten minutes, the volumes of hydrogen and
oxygen are measured. Two further experiments are carried out, changing only one factor in each
experiment. All other factors are kept the same. The table shows the conditions and results for all
three experiments.

Analyse this data to explain the effect of changing the time and the current on the volumes of
hydrogen and oxygen produced.
(6marks)

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.