100cm' of 0.100mol dm3 potassium hydroxide is diluted by adding xcm' of water. The new concentration of the potassium hydroxide is 0.0800 mol dm? Which one of the following gives the value of x in cm??
A - 20
B - 25
C - 40
D - 80

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.