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Reactivity with Air and Water (Group 2)

Mg burns in a...

Question

Mg burns in air to form two compound (A) and (B). (A) is sparingly soluble in water and the resulting solution is weakly basic. (B) dissolve in water to form (C) and gas (D) with dilute $H N O_{3}$ gives (E). E on heating gives gas (F) which behaves as an oxidising agent too. Gas F on reaction with phosphorus produce an important dehydrating agent (G). The compound G is:

P_{4} O_{10}

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H P O_{3}

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P C l_{5}

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P_{4} O_{6}

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Solution

The correct option is A $P_{4} O_{10}$
$2 M g + O_{2} \to 2 M g O$
(A)
$3 M g + N_{2} \to M g_{3} N_{2}$
(B)
Now,
$M g_{3} N_{2} + 6 H_{2} O \to 2 M g {(O H)}_{2} + 2 N H_{3}$
(B) (C) (D)
$N H_{3} + H N O_{3} \to N H_{4} N O_{3}$
(E)
$N H_{4} N O_{3} Δ \to 2 H_{2} O + N_{2} O$
(F)

$P_{4} + 10 N_{2} O \to P_{4} O_{10} + N_{2}$
(G)

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The correct option is A P4O102Mg+O2→2MgO (A)3Mg+N2→Mg3N2 (B)Now,Mg3N2+6H2O→2Mg(OH)2+2NH3 (B) (C) (D)NH3+HNO3→NH4NO3 (E)NH4NO3Δ→2H2O+N2O (F)P4+10N2O→P4O10+N2 (G)