Zn gives H2 gas with H2SO4 and HCI but not with HNO3 because :-

Question

Zn gives H2 gas with H2SO4 and HCI but not with HNO3 because :- (A) Zn act as oxidising agent when react with HNO3 (B) HBO3 is weaker acid than H2SO4 HCI (C) In electrochemical series Zn is placed above hydrogen (D) NO⊖3 is reduced in preference to hydronium ion

Tardigrade Admin · Accepted Answer

Zn have lower value of Ecell* and easily gives oxidation. Zn is present above H2 in electrochemical series. So, it liberates hydrogen gas from dilu. HCI/H2SO4. But HNO3 is an oxidising agent. The hydrogen obtained in this reaction is converted into H2O. In HNO3, NO3- ion is reduced and give NH4 NO3, N2O, NO and NO2 (based upon the concentration of HNO3 ) [ Zn + 2HNO3 longrightarrow Zn ( NO3)2 + 2 H] × 4 (Nearly 6% ) HNO3 + BH longrightarrow NH3 + 3H2O ( NH3 + HNO2 longrightarrow NH4 NO3/ 4Zn + 10HNO3 longrightarrow 4 Zn ( NO3)2 + NH4 NO3 + 3H2O)

Q. Zn gives $H_{2}$ gas with $H_{2} S O_{4}$ and HCI but not with $H N O_{3}$ because :-

$Z n$ act as oxidising agent when react with $H N O_{3}$

$H B O_{3}$ is weaker acid than $H_{2} S O_{4}$ & HCI

In electrochemical series Zn is placed above hydrogen

$N O_{3}^{⊖}$ is reduced in preference to hydronium ion

Q. Zn gives H2​ gas with H2​SO4​ and HCI but not with HNO3​ because :-

Zn act as oxidising agent when react with HNO3​

HBO3​ is weaker acid than H2​SO4​ & HCI

In electrochemical series Zn is placed above hydrogen

NO3⊖​ is reduced in preference to hydronium ion

Q. Zn gives $H_{2}$ gas with $H_{2} S O_{4}$ and HCI but not with $H N O_{3}$ because :-

$Z n$ act as oxidising agent when react with $H N O_{3}$

$H B O_{3}$ is weaker acid than $H_{2} S O_{4}$ & HCI

$N O_{3}^{⊖}$ is reduced in preference to hydronium ion