Answer
a) $SCl_2$
b) $N_2O_5$
c) $SiCl_4$
d) $B_2O_3$
Work Step by Step
a) 1 S, 2 Cl: $SCl_2$
b) 2 N, 5 O: $N_2O_5$
c) 1 Si, 4 Cl: $SiCl_4$
d) 2 B, 3 O: $B_2O_3$
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