In a spontaneous change, which of the following is true?

entropy always decreases.

temperature always increases.

gibbs free energy always decreases.

gibbs free energy always increases.

Gibbs free energy always decreases.

Explanation:

Entropy always decreases. False. For a spontaneous reaction entropy always increases.

Temperature always increases. False. A reaction may be spontaneous at high or low temperatures.

Gibbs free energy always decreases. True. For a spontaneous reaction Gibb’s free energy always decreases. ΔG is < 0. Gibb's free energy equation is:

ΔG = ΔH -TΔS

Gibbs free energy always increases. False.

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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.