How many of the following statements are true
Statement-I: All trihalides of nitrogen undergoes hydrolysis except $N F_{3}$
Statement-II: Fluoride of antimony in +5 oxidation state on reaction with hydrofluoric acid forms a superacid
Statement-III: Trioxides of group-15 elements can act as both oxidizing and reducing agents and their oxidizing and reducing power decreases from top to bottom in the group
Statement-IV: Air bags in cars contains sodium Azide
Statement-V: Among $H_{3} P {O_{5}}^{,} H_{4} P_{2} O_{8}, H_{4} P_{2} O_{7}, H N O_{4}$ peroxide linkage is absent in two oxyacids.
Statement-VI: Nonmetal shows – 3 oxidation state in all $C a_{3} N_{2}, C a_{3} P_{2}, Z n_{3} S b_{2}, B a {(N_{3})}_{2}, M g_{3} N_{2}$

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