An orange solid A on heating gives a green residue B, a colourless gas C and water vapours. The dry gas C upon pasing over heated Mg gave a white solid D which upon subsequent reaction with water gave a gas E that gave dense white fumes with HCl. Identify D

Question

An orange solid A on heating gives a green residue B, a colourless gas C and water vapours. The dry gas C upon pasing over heated Mg gave a white solid D which upon subsequent reaction with water gave a gas E that gave dense white fumes with HCl. Identify D (A) Fe(NH3)Cl2 (B) CuN2 (C) Mg3N2 (D) NH4Cl

Tardigrade Admin · Accepted Answer

An orange solid, i.e. ( NH 4)2 Cr 2 O 7(A) on heating gives a green residue, i.e. Cr 2 O 3(B), a colourless gas, i.e. N 2(C) and water vapours. The dry gas ( N 2) upon passing over heated Mg gave a white solid, i.e. Mg 3 N 2(D) which upon subsequent reaction with water gave a gas, i.e. NH 3(E) that gave dense white fumes with HCl. Reactions involved are underset(A)( NH 4)2 Cr 2 O 7 longrightarrow underset(C)N 2 uparrow+ underset(B)Cr 2 O 3+4 H 2 O underset(C)N 2+3 Mg longrightarrow underset(D)Mg 3 N 2 underset(D)Mg 3 N 2+ H 2 O longrightarrow Mg ( OH )2+ underset(E)NH 3 underset(E)NH 3+ dilHCl longrightarrow underset textdense white fumes NH 4 Cl

Q. An orange solid $A$ on heating gives a green residue $B$ , a colourless gas $C$ and water vapours. The dry gas $C$ upon pasing over heated Mg gave a white solid D which upon subsequent reaction with water gave a gas $E$ that gave dense white fumes with HCl. Identify $D$

$F e (N H_{3}) C l_{2}$

$C u N_{2}$

$M g_{3} N_{2}$

$N H_{4} Cl$

$F e C l_{2}$

Q. An orange solid A on heating gives a green residue B, a colourless gas C and water vapours. The dry gas C upon pasing over heated Mg gave a white solid D which upon subsequent reaction with water gave a gas E that gave dense white fumes with HCl. Identify D

Fe(NH3​)Cl2​

CuN2​

Mg3​N2​

NH4​Cl