Fill in the blanks a. Silica gel is used as …………… .
b. The ………. distillation is used to obtain petroleum products from crude oil.
c. Chromatography is used to separate………… .
d. Liebig’s condenser is used in ………… .
e. Plant pigment can be separated by …………… .

a:It is used as a moisturizer

b:Paraffin

c:Dissolve substances

d:Chemical distillation

e:Paper chromatography

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.