How will you prepare the following compounds? (a) Hyponitrous aci… - Vidyadip

Question

How will you prepare the following compounds?
(a) Hyponitrous acid
(b) Nitrous acid
(c) Pernitrous acid
(d) Pernitric acid

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Answer

(a) Hyponitrous acid : $Ag _2 N _2 O _2+2 HCl \longrightarrow 2 AgCl + H _2 N _2 O _2$
(b) Nitrous acid : $Ba \left( NO _2\right)_2+ H _2 SO _4 \longrightarrow 2 HNO _2+ BaSO _4$
(c) Pernitrous acid : $H _2 O _2+ ON ( OH ) \underset{\text { }}{\longrightarrow} ON ( OOH )+ H _2 O$
(d) Pernitric acid : $H _2 O _2+ N _2 O _5 \longrightarrow NO _2 OOH + HNO _3$
Common Errors And Its Rectifications:
Common Errors:
1. Oxidation number rules may be confused.
2. Oxidation number of oxygen may get confused.
3. Molecular formula and compound name may get confused.
Rectifications:
1. The oxidation number of fluorine is always -1 .
2. Always oxygen is -2 but in peroxide it is -1 . When it comes as a first element its oxidation number is positive.
3. Student should memorise the formula using short cut method, e.g. Phosphorous acid $H _3 PO _3$ Phosphoric acid $- H _3 PO _4$ e.g. Phosphorous acid $- H _3 PO _3$ By pronunciation, ' $O$ ' indicates oxygen is more.

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