Consider each of the following reactions and decide whether the standard entropy change for the reaction will be$,($a$)$ Positive; or $($b$)$ Very close to Zero; or $($c$)$ Negative.

PCl$5($s$)=$ PCl$3($s$)+$ Cl$2($g$)$

BaSO$4($s$)+2$ H$2$O $($g$)=$ BaSO$4\mathrm{.}2$H$2$O $($s$)$

Cu $($s$)+2$ H$2$SO$4($aq$)=$ CuSO$4($aq$)+2$ H$2$O $($l$)+$ SO$2($g$)$

H$2($g$)+$ Cl$2($g$)=2$ HCl $($g$)$

N$2($g$)+3$ H$2($g$)=2$ NH$3($g$)$

$2$ Na $($l$)+$ H$2($g$)=2$ NaH $($s$)$

Cu $($s$)+2$ H$2$SO$4($aq$)=$ CuSO$4($aq$)+2$ H$2$O $($l$)+$ SO$2($g$)$

C$6$H$12$O$6($s$)+6$ O$2($g$)=6$ CO$2($g$)+6$ H$2$O $($l$)$

N$2($g$)+3$ H$2($g$)=2$ NH$3($g$)$

BaSO$4($s$)+2$ H$2$O $($g$)=$ BaSO$4\mathrm{.}2$H$2$O $($s$)$

C $($s$)+$ H$2$O $($g$)=$ CO $($g$)+$ H$2($g$)$

H$2($g$)+$ Cl$2($g$)=2$ HCl $($g$)$