pBlock ElementsII - Result Question 87
####83. Write balanced equations for the following.
(i) Phosphorus is treated with concentrated nitric acid.
(ii) Oxidation of hydrogen peroxide with potassium permanganate in acidic medium.
(iii) Manufacture of phosphoric acid from phosphorus.
(iv) Reaction of aluminium with aqueous sodium hydroxide.
$(1997,1 M \times 4=4 M)$
Show Answer
Solution:
- (i) $P _4+20 HNO _3 \longrightarrow 4 H _3 PO _4+20 NO _2+4 H _2 O$
(ii) $3 KMnO _4+5 H _2 O _2+3 H _2 SO _4 \longrightarrow K _2 SO _4$
$$ +2 MnSO _4+5 O _2+8 H _2 O $$
(iii) $P _4+20 HNO _3 \longrightarrow 4 H _3 PO _4+20 NO _2+4 H _2 O$
(iv) $2 Al+2 NaOH+2 H _2 O \longrightarrow 2 NaAlO _2+3 H _2$
