A solution of a colourless salt (s) on boiling with excess NaOH produces a non-inflammable gas. The evolution of gas ceases after sometime and upon addition of zinc dust to the same solution, the evolution of gas restarts. The colourless salt(s) is/(are):

Question

A solution of a colourless salt (s) on boiling with excess NaOH produces a non-inflammable gas. The evolution of gas ceases after sometime and upon addition of zinc dust to the same solution, the evolution of gas restarts. The colourless salt(s) is/(are): (A) NH 4 NO 3 (B) NH 4 NO 2 (C) (a) (b) (D) ( NH 4)2 SO 4

Tardigrade Admin · Accepted Answer

NH 4 NO 3+ NaOH arrow NaNO 3+ NH 3+ H 2 O 4 Zn +7 NaOH + NaNO 3 arrow 4 Na 2 ZnO 2+ NH 3+2 H 2 O NH 4 NO 2+ NaOH arrow NaNO 2+ NH 3+ H 2 O 3 Zn +5 NaOH + NaNO 2 arrow 3 Na 2 ZnO 2+ NH 3+ H 2 O

Q. A solution of a colourless salt (s) on boiling with excess $N a O H$ produces a non-inflammable gas. The evolution of gas ceases after sometime and upon addition of zinc dust to the same solution, the evolution of gas restarts. The colourless salt(s) is/(are):

$N H_{4} N O_{3}$

$N H_{4} N O_{2}$

$(a) & (b)$

$(N H_{4})_{2} S O_{4}$

$N H_{4} N O_{3} + N a O H \to N a N O_{3} + N H_{3} + H_{2} O$

$4 Z n + 7 N a O H + N a N O_{3} \to 4 N a_{2} Z n O_{2} + N H_{3} + 2 H_{2} O$

$N H_{4} N O_{2} + N a O H \to N a N O_{2} + N H_{3} + H_{2} O$

$3 Z n + 5 N a O H + N a N O_{2} \to 3 N a_{2} Z n O_{2} + N H_{3} + H_{2} O$

Q. A solution of a colourless salt (s) on boiling with excess NaOH produces a non-inflammable gas. The evolution of gas ceases after sometime and upon addition of zinc dust to the same solution, the evolution of gas restarts. The colourless salt(s) is/(are):

NH4​NO3​

NH4​NO2​

(a)&(b)

(NH4​)2​SO4​