What happens in a reaction if it is at chemical equilibrium? 1)The rate of the forward reaction exceeds that of the reverse reaction.

2)All of the products are used up.

3)The rate of the forward reaction equals the rate of the reverse reaction.

4)The rate of the reverse reaction exceeds that of the forward reaction.

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.

answer seismograph;