Question

Statement I : $S{O}_3$ diffuses more slowly than $C{O}_2$.
Statement II : $S{O}_3$ has smaller bond angles.

• A. Statement I is true, statement II is true and statement II is correct explanation of statement I
• B. Statement I is true, statement II is true and statement II is not correct explanation of statement I
• C. Statement I is true, statement II is false
• D. Statement I is false, statement II is true
• E. Statement I is false, statement II is false

Answer 1

Answer: (B)

Statement I is true, statement II is true and statement II is not correct explanation of statement I

Statement I : $S{O}_3$ diffuses more slowly than $C{O}_2$.
The rate of diffusion is inversely proportional to the square root of molecular weight. $S{O}_3$ having higher molecular weight diffuses more slowly than $C{O}_2$ having lower molecular weight.

Statement II : $S{O}_3$ has smaller bond angles than $C{O}_2$.
$C{O}_2$ has linear structure with $O-C-O$ bond angle of 180 ${}^o$. $S{O}_3$ has trigonal planar structure with $O-S-O$ bond angle of 120 ${}^o$.
Hence, statement I is true, statement II is true and statement II is not the correct explanation of statement I.