37524
The brown ring test for \(NO_2\) and \(N{O_3}^ - \) is due to the formation of complex ion with the formula
1 \({[Fe{({H_2}O)_6}]^{2 +}}\)
2 \({[Fe(NO)(CN)]^{2 +}}\)
3 \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
4 \({[Fe{({H_2}O)}{NO_5}]^{2 +}}\)
Explanation:
(c)The brown ring test for \(NO_2^ - \) and \(NO_3^ - \) is due to formation of \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
PRACTICAL CHEMISTRY
37525
Mixture is heated with dil. \({H_2}S{O_4}\) and the lead acetate paper turns black by the evolved gases. The mixture contains
1 Sulphite
2 Sulphide
3 Sulphate
4 Thiosulphate
Explanation:
(b)It must be sulphide as \(Pb{(C{H_3}COO)_2}\; + \;{H_2}S\mathop { \to PbS\,\, + }\limits_{\,\,\,({\rm{Black }}\,\,{\rm{ppt}}{\rm{.)}}} 2C{H_3}COOH\)
PRACTICAL CHEMISTRY
37526
To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \(N{H_4}OH\). However, when \(HCl\) is added to the original solution, a white precipitate is formed. The solution contained
1 Lead salt
2 Silver salt
3 Mercurous salt
4 Copper salt
Explanation:
(c)\(H{g_2}C{l_2}\) is white insoluble salt. \(H{g_2}C{l_2} + 2N{H_4}OH \to \,\underbrace {Hg + Hg(N{H_2})Cl + N{H_4}Cl}_{{\text{Black}}} + 2{H_2}O\)
PRACTICAL CHEMISTRY
37527
If \(NaOH\) is added to an aqueous solution of zinc ions, a white precipitate appears and on adding excess \(NaOH\), the precipitate dissolves. In this solution zinc exists in the
37524
The brown ring test for \(NO_2\) and \(N{O_3}^ - \) is due to the formation of complex ion with the formula
1 \({[Fe{({H_2}O)_6}]^{2 +}}\)
2 \({[Fe(NO)(CN)]^{2 +}}\)
3 \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
4 \({[Fe{({H_2}O)}{NO_5}]^{2 +}}\)
Explanation:
(c)The brown ring test for \(NO_2^ - \) and \(NO_3^ - \) is due to formation of \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
PRACTICAL CHEMISTRY
37525
Mixture is heated with dil. \({H_2}S{O_4}\) and the lead acetate paper turns black by the evolved gases. The mixture contains
1 Sulphite
2 Sulphide
3 Sulphate
4 Thiosulphate
Explanation:
(b)It must be sulphide as \(Pb{(C{H_3}COO)_2}\; + \;{H_2}S\mathop { \to PbS\,\, + }\limits_{\,\,\,({\rm{Black }}\,\,{\rm{ppt}}{\rm{.)}}} 2C{H_3}COOH\)
PRACTICAL CHEMISTRY
37526
To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \(N{H_4}OH\). However, when \(HCl\) is added to the original solution, a white precipitate is formed. The solution contained
1 Lead salt
2 Silver salt
3 Mercurous salt
4 Copper salt
Explanation:
(c)\(H{g_2}C{l_2}\) is white insoluble salt. \(H{g_2}C{l_2} + 2N{H_4}OH \to \,\underbrace {Hg + Hg(N{H_2})Cl + N{H_4}Cl}_{{\text{Black}}} + 2{H_2}O\)
PRACTICAL CHEMISTRY
37527
If \(NaOH\) is added to an aqueous solution of zinc ions, a white precipitate appears and on adding excess \(NaOH\), the precipitate dissolves. In this solution zinc exists in the
37524
The brown ring test for \(NO_2\) and \(N{O_3}^ - \) is due to the formation of complex ion with the formula
1 \({[Fe{({H_2}O)_6}]^{2 +}}\)
2 \({[Fe(NO)(CN)]^{2 +}}\)
3 \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
4 \({[Fe{({H_2}O)}{NO_5}]^{2 +}}\)
Explanation:
(c)The brown ring test for \(NO_2^ - \) and \(NO_3^ - \) is due to formation of \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
PRACTICAL CHEMISTRY
37525
Mixture is heated with dil. \({H_2}S{O_4}\) and the lead acetate paper turns black by the evolved gases. The mixture contains
1 Sulphite
2 Sulphide
3 Sulphate
4 Thiosulphate
Explanation:
(b)It must be sulphide as \(Pb{(C{H_3}COO)_2}\; + \;{H_2}S\mathop { \to PbS\,\, + }\limits_{\,\,\,({\rm{Black }}\,\,{\rm{ppt}}{\rm{.)}}} 2C{H_3}COOH\)
PRACTICAL CHEMISTRY
37526
To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \(N{H_4}OH\). However, when \(HCl\) is added to the original solution, a white precipitate is formed. The solution contained
1 Lead salt
2 Silver salt
3 Mercurous salt
4 Copper salt
Explanation:
(c)\(H{g_2}C{l_2}\) is white insoluble salt. \(H{g_2}C{l_2} + 2N{H_4}OH \to \,\underbrace {Hg + Hg(N{H_2})Cl + N{H_4}Cl}_{{\text{Black}}} + 2{H_2}O\)
PRACTICAL CHEMISTRY
37527
If \(NaOH\) is added to an aqueous solution of zinc ions, a white precipitate appears and on adding excess \(NaOH\), the precipitate dissolves. In this solution zinc exists in the
37524
The brown ring test for \(NO_2\) and \(N{O_3}^ - \) is due to the formation of complex ion with the formula
1 \({[Fe{({H_2}O)_6}]^{2 +}}\)
2 \({[Fe(NO)(CN)]^{2 +}}\)
3 \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
4 \({[Fe{({H_2}O)}{NO_5}]^{2 +}}\)
Explanation:
(c)The brown ring test for \(NO_2^ - \) and \(NO_3^ - \) is due to formation of \({[Fe{({H_2}O)_5}NO]^{2 + }}\)
PRACTICAL CHEMISTRY
37525
Mixture is heated with dil. \({H_2}S{O_4}\) and the lead acetate paper turns black by the evolved gases. The mixture contains
1 Sulphite
2 Sulphide
3 Sulphate
4 Thiosulphate
Explanation:
(b)It must be sulphide as \(Pb{(C{H_3}COO)_2}\; + \;{H_2}S\mathop { \to PbS\,\, + }\limits_{\,\,\,({\rm{Black }}\,\,{\rm{ppt}}{\rm{.)}}} 2C{H_3}COOH\)
PRACTICAL CHEMISTRY
37526
To a solution of a substance, gradual addition of ammonium hydroxide results in a black precipitate which does not dissolve in excess of \(N{H_4}OH\). However, when \(HCl\) is added to the original solution, a white precipitate is formed. The solution contained
1 Lead salt
2 Silver salt
3 Mercurous salt
4 Copper salt
Explanation:
(c)\(H{g_2}C{l_2}\) is white insoluble salt. \(H{g_2}C{l_2} + 2N{H_4}OH \to \,\underbrace {Hg + Hg(N{H_2})Cl + N{H_4}Cl}_{{\text{Black}}} + 2{H_2}O\)
PRACTICAL CHEMISTRY
37527
If \(NaOH\) is added to an aqueous solution of zinc ions, a white precipitate appears and on adding excess \(NaOH\), the precipitate dissolves. In this solution zinc exists in the
