A solution of colourless salt H on boiling wi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The gas evolved is $NH_3$ (ammonia),which is non-flammable. $NH_4^+$ salts react with $NaOH$ to release $NH_3$ gas: $NH_4^+ + OH^- \longrightarrow

Vedclass · Accepted Answer

$A, B$

Vedclass · Answer

(B) The gas evolved is $NH_3$ (ammonia),which is non-flammable. $NH_4^+$ salts react with $NaOH$ to release $NH_3$ gas: $NH_4^+ + OH^- \longrightarrow NH_3 + H_2O$. When the $NH_4^+$ ions are consumed,the evolution of $NH_3$ stops. If the salt contains an oxidizing anion like $NO_3^-$ or $NO_2^-$,the addition of $Zn$ dust in an alkaline medium reduces the anion to $NH_3$ gas,causing the evolution to restart. $NH_4NO_3 + 4Zn + 7NaOH \longrightarrow 4Na_2ZnO_2 + 2NH_3 + 2H_2O$. $NH_4NO_2 + 3Zn + 5NaOH \longrightarrow 3Na_2ZnO_2 + 2NH_3 + H_2O$. $NH_4Cl$ and $(NH_4)_2SO_4$ do not contain oxidizing anions,so they will not produce further $NH_3$ upon adding $Zn$ dust. Thus,$H$ can be $NH_4NO_3$ or $NH_4NO_2$.

$A$ solution of colourless salt $H$ on boiling with excess $NaOH$ produces a non-flammable gas. The gas evolution ceases after sometime. Upon addition of $Zn$ dust to the same solution,the gas evolution restarts. The colourless salt$(s)$ $H$ is (are):

Similar Questions

Ferrous sulphate on strong heating gives:

Equivalent weights of $KMnO_4$ and $K_2Cr_2O_7$ in acidic medium are respectively. (Molecular weight of $KMnO_4 = M_A$ and Molecular weight of $K_2Cr_2O_7 = M_B$).

In chloro-alkali industries,during the Solvay ammonia process,a redox change occurs during:

$KMnO_4$ oxidises $C_2H_2O_4$ to form $CO_2$. In which of the following,the reaction will be faster?

One litre of $0.15 \ M \ Na_2SO_3$ aqueous solution is mixed with $500 \ mL$ of $0.2 \ M \ K_2Cr_2O_7$ aqueous solution in acid medium. What is the concentration (in $mol \ L^{-1}$) of unreacted $K_2Cr_2O_7$ in the resultant solution?

Vedclass Test Series

Exam Paper Generator

Online Exam Module