Which of the following statement(s) is/are incorrect?

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$B i F_{3}$ is covalent while $N F_{3}$ and $P F_{3}$ are ionic

Number of $d π - p π$ bonds in $N_{2} O_{5}$ are 2

$N H_{3} > H_{2} O > H F :$ order of boiling points

$[C r {(H_{2} O)}_{6}] B r_{2} > {(E t_{4} N)}_{2} [C o C l_{4}] > N a_{3} [F e {(o x)}_{3}] (Δ_{0} > P) > N a_{4} [F e {(C N)}_{6}] :$

correct order of spin – only magnetic moment values

answer is A, B, D.

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Detailed Solution

-(i) $B i F_{3} - i o n i c$ and ${NF}_{3} {,PF}_{3} -covalnet$
(ii) $H_{2} O > H F > N H_{3} :$ order of boiling points
(iii) $N_{2} O_{5}$ : only $p π - p π$ bonds
(iv) ${[C r {(H_{2} O)}_{6}]}^{2 +} : C r^{2 +} : 3 d^{4} : t_{2 g}^{3} e_{g}^{1} (n = 4)$
${[C o C l_{4}]}^{2 -} : C o^{2 +} : 3 d^{7} : t_{2 g}^{5} e_{g}^{2} (n = 3) {[F e {(o x)}_{3}]}^{- 3} : F e^{3 +} (Δ_{0} > P) : 3 d^{5} : t_{2 g}^{5} (n = 1) {[F e {(C N)}_{6}]}^{- 4} : F e^{2 +} : 3 d^{6} : t_{2 g}^{6} (n = 0)$