37554
An aqueous solution of a salt \(X\) turns blood red on treatment with \(CNS^-\) and blue on treatment with \(K_4[Fe(CN)_6].\) \(X\) also gives a positive chromyl chloride test.The salt \(X\) is
1 \(CuCl_2\)
2 \(FeCl_3\)
3 \(Cu(NO_3)_2\)
4 \(Fe(NO_3)_3\)
Explanation:
\(Fe^{3+}\) radical gives blood red with \(SCN^-\) \(F{{e}^{3+}}+3CN{{S}^{-}}\to Fe{{(CNS)}_{3}}\) Ferric sulphocyanide (Blood red colouration) \(Fe^{3+}\) gives blue coloue on treatment with \({{K}_{4}}[Fe{{(CN)}_{6}}]\) $4F{{e}^{3+}}+3{{K}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} Ferric\,ferrocyanide \\ (\Pr ussian\,blue) \end{smallmatrix}}{\mathop{12{{K}^{+}}+F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}}}\,$ \(Cl^-\) radical gives chromyl chloride test.
PRACTICAL CHEMISTRY
37555
The cation that will not be precipitated by \(H_2S\) in the presence of dil. \(HCl\) is
1 \(Pb^{2+}\)
2 \(Cu^{2+}\)
3 \(Co^{2+}\)
4 \(As^{3+}\)
Explanation:
\(Co^{+2}\) ion is precipitated by \(H_2S\) in presence of \(NH_4OH\) which is a group reagent of group \(IV\) in cationic analysis .
PRACTICAL CHEMISTRY
37556
Sodium Carbonate cannot be used in place of \((NH_4)_2CO_3\) for the identification of \(Ca^{2+}, Ba^{2+}\) and \(Sr^{2+}\) ions (in group \(V\)) during mixture analysis because
1 \(Mg^{2+}\) ions will also be precipitated
2 Concentration of \(CO_3^{2 - }\) ions is very low
3 Sodium ions will react with acid radicals
4 \(Na^+\) ions will interfere with the detection of \(C{a^{2 + }}\) , \(B{a^{2 + }}\) , \(S{r^{2 + }}\) ions
Explanation:
If \(Na_2CO_3\) is used in place of \((NH_4)_2CO_3\). It will precipitate group \(V\) radicals as well as magnesium radicals. The reason for this is the high ionization of \(Na_2CO_3\) in water into \(Na^+\) and \(CO_3 ^ -\). Now the higher concentration of \(CO_3^-\) is available which exceeds the solubility product of group \(V\) radicals as well as that of magnesium radicals
PRACTICAL CHEMISTRY
37557
The substance used as froth stabilisers in forth-floatation process is
1 Potassium ethyl xanthate
2 Aniline
3 Sodium cyanide
4 Copper sulphate
Explanation:
Froth stabilizers cresols, aniline are added to stabilize the froth and enhance the nonwettability of the mineral particles.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
PRACTICAL CHEMISTRY
37554
An aqueous solution of a salt \(X\) turns blood red on treatment with \(CNS^-\) and blue on treatment with \(K_4[Fe(CN)_6].\) \(X\) also gives a positive chromyl chloride test.The salt \(X\) is
1 \(CuCl_2\)
2 \(FeCl_3\)
3 \(Cu(NO_3)_2\)
4 \(Fe(NO_3)_3\)
Explanation:
\(Fe^{3+}\) radical gives blood red with \(SCN^-\) \(F{{e}^{3+}}+3CN{{S}^{-}}\to Fe{{(CNS)}_{3}}\) Ferric sulphocyanide (Blood red colouration) \(Fe^{3+}\) gives blue coloue on treatment with \({{K}_{4}}[Fe{{(CN)}_{6}}]\) $4F{{e}^{3+}}+3{{K}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} Ferric\,ferrocyanide \\ (\Pr ussian\,blue) \end{smallmatrix}}{\mathop{12{{K}^{+}}+F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}}}\,$ \(Cl^-\) radical gives chromyl chloride test.
PRACTICAL CHEMISTRY
37555
The cation that will not be precipitated by \(H_2S\) in the presence of dil. \(HCl\) is
1 \(Pb^{2+}\)
2 \(Cu^{2+}\)
3 \(Co^{2+}\)
4 \(As^{3+}\)
Explanation:
\(Co^{+2}\) ion is precipitated by \(H_2S\) in presence of \(NH_4OH\) which is a group reagent of group \(IV\) in cationic analysis .
PRACTICAL CHEMISTRY
37556
Sodium Carbonate cannot be used in place of \((NH_4)_2CO_3\) for the identification of \(Ca^{2+}, Ba^{2+}\) and \(Sr^{2+}\) ions (in group \(V\)) during mixture analysis because
1 \(Mg^{2+}\) ions will also be precipitated
2 Concentration of \(CO_3^{2 - }\) ions is very low
3 Sodium ions will react with acid radicals
4 \(Na^+\) ions will interfere with the detection of \(C{a^{2 + }}\) , \(B{a^{2 + }}\) , \(S{r^{2 + }}\) ions
Explanation:
If \(Na_2CO_3\) is used in place of \((NH_4)_2CO_3\). It will precipitate group \(V\) radicals as well as magnesium radicals. The reason for this is the high ionization of \(Na_2CO_3\) in water into \(Na^+\) and \(CO_3 ^ -\). Now the higher concentration of \(CO_3^-\) is available which exceeds the solubility product of group \(V\) radicals as well as that of magnesium radicals
PRACTICAL CHEMISTRY
37557
The substance used as froth stabilisers in forth-floatation process is
1 Potassium ethyl xanthate
2 Aniline
3 Sodium cyanide
4 Copper sulphate
Explanation:
Froth stabilizers cresols, aniline are added to stabilize the froth and enhance the nonwettability of the mineral particles.
37554
An aqueous solution of a salt \(X\) turns blood red on treatment with \(CNS^-\) and blue on treatment with \(K_4[Fe(CN)_6].\) \(X\) also gives a positive chromyl chloride test.The salt \(X\) is
1 \(CuCl_2\)
2 \(FeCl_3\)
3 \(Cu(NO_3)_2\)
4 \(Fe(NO_3)_3\)
Explanation:
\(Fe^{3+}\) radical gives blood red with \(SCN^-\) \(F{{e}^{3+}}+3CN{{S}^{-}}\to Fe{{(CNS)}_{3}}\) Ferric sulphocyanide (Blood red colouration) \(Fe^{3+}\) gives blue coloue on treatment with \({{K}_{4}}[Fe{{(CN)}_{6}}]\) $4F{{e}^{3+}}+3{{K}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} Ferric\,ferrocyanide \\ (\Pr ussian\,blue) \end{smallmatrix}}{\mathop{12{{K}^{+}}+F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}}}\,$ \(Cl^-\) radical gives chromyl chloride test.
PRACTICAL CHEMISTRY
37555
The cation that will not be precipitated by \(H_2S\) in the presence of dil. \(HCl\) is
1 \(Pb^{2+}\)
2 \(Cu^{2+}\)
3 \(Co^{2+}\)
4 \(As^{3+}\)
Explanation:
\(Co^{+2}\) ion is precipitated by \(H_2S\) in presence of \(NH_4OH\) which is a group reagent of group \(IV\) in cationic analysis .
PRACTICAL CHEMISTRY
37556
Sodium Carbonate cannot be used in place of \((NH_4)_2CO_3\) for the identification of \(Ca^{2+}, Ba^{2+}\) and \(Sr^{2+}\) ions (in group \(V\)) during mixture analysis because
1 \(Mg^{2+}\) ions will also be precipitated
2 Concentration of \(CO_3^{2 - }\) ions is very low
3 Sodium ions will react with acid radicals
4 \(Na^+\) ions will interfere with the detection of \(C{a^{2 + }}\) , \(B{a^{2 + }}\) , \(S{r^{2 + }}\) ions
Explanation:
If \(Na_2CO_3\) is used in place of \((NH_4)_2CO_3\). It will precipitate group \(V\) radicals as well as magnesium radicals. The reason for this is the high ionization of \(Na_2CO_3\) in water into \(Na^+\) and \(CO_3 ^ -\). Now the higher concentration of \(CO_3^-\) is available which exceeds the solubility product of group \(V\) radicals as well as that of magnesium radicals
PRACTICAL CHEMISTRY
37557
The substance used as froth stabilisers in forth-floatation process is
1 Potassium ethyl xanthate
2 Aniline
3 Sodium cyanide
4 Copper sulphate
Explanation:
Froth stabilizers cresols, aniline are added to stabilize the froth and enhance the nonwettability of the mineral particles.
37554
An aqueous solution of a salt \(X\) turns blood red on treatment with \(CNS^-\) and blue on treatment with \(K_4[Fe(CN)_6].\) \(X\) also gives a positive chromyl chloride test.The salt \(X\) is
1 \(CuCl_2\)
2 \(FeCl_3\)
3 \(Cu(NO_3)_2\)
4 \(Fe(NO_3)_3\)
Explanation:
\(Fe^{3+}\) radical gives blood red with \(SCN^-\) \(F{{e}^{3+}}+3CN{{S}^{-}}\to Fe{{(CNS)}_{3}}\) Ferric sulphocyanide (Blood red colouration) \(Fe^{3+}\) gives blue coloue on treatment with \({{K}_{4}}[Fe{{(CN)}_{6}}]\) $4F{{e}^{3+}}+3{{K}_{4}}[Fe{{(CN)}_{6}}]\to \underset{\begin{smallmatrix} Ferric\,ferrocyanide \\ (\Pr ussian\,blue) \end{smallmatrix}}{\mathop{12{{K}^{+}}+F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}}}\,$ \(Cl^-\) radical gives chromyl chloride test.
PRACTICAL CHEMISTRY
37555
The cation that will not be precipitated by \(H_2S\) in the presence of dil. \(HCl\) is
1 \(Pb^{2+}\)
2 \(Cu^{2+}\)
3 \(Co^{2+}\)
4 \(As^{3+}\)
Explanation:
\(Co^{+2}\) ion is precipitated by \(H_2S\) in presence of \(NH_4OH\) which is a group reagent of group \(IV\) in cationic analysis .
PRACTICAL CHEMISTRY
37556
Sodium Carbonate cannot be used in place of \((NH_4)_2CO_3\) for the identification of \(Ca^{2+}, Ba^{2+}\) and \(Sr^{2+}\) ions (in group \(V\)) during mixture analysis because
1 \(Mg^{2+}\) ions will also be precipitated
2 Concentration of \(CO_3^{2 - }\) ions is very low
3 Sodium ions will react with acid radicals
4 \(Na^+\) ions will interfere with the detection of \(C{a^{2 + }}\) , \(B{a^{2 + }}\) , \(S{r^{2 + }}\) ions
Explanation:
If \(Na_2CO_3\) is used in place of \((NH_4)_2CO_3\). It will precipitate group \(V\) radicals as well as magnesium radicals. The reason for this is the high ionization of \(Na_2CO_3\) in water into \(Na^+\) and \(CO_3 ^ -\). Now the higher concentration of \(CO_3^-\) is available which exceeds the solubility product of group \(V\) radicals as well as that of magnesium radicals
PRACTICAL CHEMISTRY
37557
The substance used as froth stabilisers in forth-floatation process is
1 Potassium ethyl xanthate
2 Aniline
3 Sodium cyanide
4 Copper sulphate
Explanation:
Froth stabilizers cresols, aniline are added to stabilize the froth and enhance the nonwettability of the mineral particles.