Question

Read the following statements regarding chemical reactivity of group $15$ elements.
(i) Only compound of Bi with $+5$ oxidation state is $Bi{F}_5$.
(ii) Intermediate oxidation states for both nitrogen and phosphorus disproportionate in both acid and alkali.
(iii) Nitrogen due to absence of d-orbitals in its valence shell cannot form $d\pi -p\pi$ bond as the heavier elements thus $R_{3}P=O$ exists but $R_{3}N=O$ does not exists.
(iv) $Bi{H}_3$ is the strongest reducing agent amongst the hydrides of nitrogen family.
(v) $P_2{O}_3$ is more acidic than $P_2{O}_5$
Which of the following is the correct code for the statements above?

• A. $FTFFT$
• B. $FFTTF$
• C. $TFTTF$
• D. $TFTFT$

Answer 1

Answer: (C)

For nitrogen oxidation states from $+1$ to $+4$ disproportionate in acidic solution only. Oxidation state of phosphorous in $P_2{O}_5$ is $+5$ whereas in $P_2{O}_5$ is $+3$ thus $P_2{O}_5$ is more acidic than $P_2{O}_3$.