37541
The colour of \(CuC{r_2}{O_7}\) solution in water is green because
1 \(C{r_2}O_7^{2 - }\) ions are green
2 \(C{u^{ + + }}\) ions are green
3 Both ions are green
4 \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{2 - }\) ions are yellow
Explanation:
(d) \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{ - - }\) ions are yellow, yellow and blue combination gives-green colour.
PRACTICAL CHEMISTRY
37542
\(P{b^{ + + }},\) \(C{u^{ + + }},\) \(Z{n^{ + + }},\) and \(N{i^{ + + }}\) ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
1 \(PbS\) and \(NiS\)
2 \(PbS\) and \(CuS\)
3 \(CuS\) and \(ZnS\)
4 \(CuS\) and \(NiS\)
Explanation:
(b) As both \(P{b^{2 + }}\) and \(C{u^{2 + }}\) require acidic medium and low concentration of \({S^{2 - }}\) be precipitated as sulphide and low concentration of \({S^{2 - }}\) is provided by common ion effect of \(HCl\) and \(H_2S\)
PRACTICAL CHEMISTRY
37543
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is \(294\) grams, its gram equivalent weight is……grams
1 \(294\)
2 \(127\)
3 \(49\)
4 \(24.5\)
Explanation:
(c) In acidic medium potassium dicromate shows \(+ 6\) oxidation state \(\frac{M}{6} = \frac{{294}}{6} = 49\)
PRACTICAL CHEMISTRY
37544
Metallic tin in the presence of \(HCl\) is oxidise \({K_2}\) \(Cr_2O_7\) to stannic chloride. What volume of decinormal dichromate solution would be reduced by \(1 \,g \) of tin......\(ml\)
1 \(168.49\)
2 \(175.49\)
3 \(170.50\)
4 \(162.38\)
Explanation:
(a) \(0.1 \times V = \frac{2}{{119}}\) \(V = 168.06\,ml\).
PRACTICAL CHEMISTRY
37560
The reagent that can distinguish between silver and lead salt is
1 \(H_2S\) gas
2 Hot dilute \(HCl\) solution
3 \(NH_4Cl (solid) + NH_4OH (solution)\)
4 \(NH_4Cl (solid) + (NH_4)_2CO_3 solution\)
Explanation:
Hot \(HCl\) will produce precipitate of \(AgCl\) with \(Ag^+\) only. \(PbCl_2\) will not precipitate because it is soluble in hot solution.
37541
The colour of \(CuC{r_2}{O_7}\) solution in water is green because
1 \(C{r_2}O_7^{2 - }\) ions are green
2 \(C{u^{ + + }}\) ions are green
3 Both ions are green
4 \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{2 - }\) ions are yellow
Explanation:
(d) \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{ - - }\) ions are yellow, yellow and blue combination gives-green colour.
PRACTICAL CHEMISTRY
37542
\(P{b^{ + + }},\) \(C{u^{ + + }},\) \(Z{n^{ + + }},\) and \(N{i^{ + + }}\) ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
1 \(PbS\) and \(NiS\)
2 \(PbS\) and \(CuS\)
3 \(CuS\) and \(ZnS\)
4 \(CuS\) and \(NiS\)
Explanation:
(b) As both \(P{b^{2 + }}\) and \(C{u^{2 + }}\) require acidic medium and low concentration of \({S^{2 - }}\) be precipitated as sulphide and low concentration of \({S^{2 - }}\) is provided by common ion effect of \(HCl\) and \(H_2S\)
PRACTICAL CHEMISTRY
37543
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is \(294\) grams, its gram equivalent weight is……grams
1 \(294\)
2 \(127\)
3 \(49\)
4 \(24.5\)
Explanation:
(c) In acidic medium potassium dicromate shows \(+ 6\) oxidation state \(\frac{M}{6} = \frac{{294}}{6} = 49\)
PRACTICAL CHEMISTRY
37544
Metallic tin in the presence of \(HCl\) is oxidise \({K_2}\) \(Cr_2O_7\) to stannic chloride. What volume of decinormal dichromate solution would be reduced by \(1 \,g \) of tin......\(ml\)
1 \(168.49\)
2 \(175.49\)
3 \(170.50\)
4 \(162.38\)
Explanation:
(a) \(0.1 \times V = \frac{2}{{119}}\) \(V = 168.06\,ml\).
PRACTICAL CHEMISTRY
37560
The reagent that can distinguish between silver and lead salt is
1 \(H_2S\) gas
2 Hot dilute \(HCl\) solution
3 \(NH_4Cl (solid) + NH_4OH (solution)\)
4 \(NH_4Cl (solid) + (NH_4)_2CO_3 solution\)
Explanation:
Hot \(HCl\) will produce precipitate of \(AgCl\) with \(Ag^+\) only. \(PbCl_2\) will not precipitate because it is soluble in hot solution.
37541
The colour of \(CuC{r_2}{O_7}\) solution in water is green because
1 \(C{r_2}O_7^{2 - }\) ions are green
2 \(C{u^{ + + }}\) ions are green
3 Both ions are green
4 \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{2 - }\) ions are yellow
Explanation:
(d) \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{ - - }\) ions are yellow, yellow and blue combination gives-green colour.
PRACTICAL CHEMISTRY
37542
\(P{b^{ + + }},\) \(C{u^{ + + }},\) \(Z{n^{ + + }},\) and \(N{i^{ + + }}\) ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
1 \(PbS\) and \(NiS\)
2 \(PbS\) and \(CuS\)
3 \(CuS\) and \(ZnS\)
4 \(CuS\) and \(NiS\)
Explanation:
(b) As both \(P{b^{2 + }}\) and \(C{u^{2 + }}\) require acidic medium and low concentration of \({S^{2 - }}\) be precipitated as sulphide and low concentration of \({S^{2 - }}\) is provided by common ion effect of \(HCl\) and \(H_2S\)
PRACTICAL CHEMISTRY
37543
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is \(294\) grams, its gram equivalent weight is……grams
1 \(294\)
2 \(127\)
3 \(49\)
4 \(24.5\)
Explanation:
(c) In acidic medium potassium dicromate shows \(+ 6\) oxidation state \(\frac{M}{6} = \frac{{294}}{6} = 49\)
PRACTICAL CHEMISTRY
37544
Metallic tin in the presence of \(HCl\) is oxidise \({K_2}\) \(Cr_2O_7\) to stannic chloride. What volume of decinormal dichromate solution would be reduced by \(1 \,g \) of tin......\(ml\)
1 \(168.49\)
2 \(175.49\)
3 \(170.50\)
4 \(162.38\)
Explanation:
(a) \(0.1 \times V = \frac{2}{{119}}\) \(V = 168.06\,ml\).
PRACTICAL CHEMISTRY
37560
The reagent that can distinguish between silver and lead salt is
1 \(H_2S\) gas
2 Hot dilute \(HCl\) solution
3 \(NH_4Cl (solid) + NH_4OH (solution)\)
4 \(NH_4Cl (solid) + (NH_4)_2CO_3 solution\)
Explanation:
Hot \(HCl\) will produce precipitate of \(AgCl\) with \(Ag^+\) only. \(PbCl_2\) will not precipitate because it is soluble in hot solution.
37541
The colour of \(CuC{r_2}{O_7}\) solution in water is green because
1 \(C{r_2}O_7^{2 - }\) ions are green
2 \(C{u^{ + + }}\) ions are green
3 Both ions are green
4 \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{2 - }\) ions are yellow
Explanation:
(d) \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{ - - }\) ions are yellow, yellow and blue combination gives-green colour.
PRACTICAL CHEMISTRY
37542
\(P{b^{ + + }},\) \(C{u^{ + + }},\) \(Z{n^{ + + }},\) and \(N{i^{ + + }}\) ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
1 \(PbS\) and \(NiS\)
2 \(PbS\) and \(CuS\)
3 \(CuS\) and \(ZnS\)
4 \(CuS\) and \(NiS\)
Explanation:
(b) As both \(P{b^{2 + }}\) and \(C{u^{2 + }}\) require acidic medium and low concentration of \({S^{2 - }}\) be precipitated as sulphide and low concentration of \({S^{2 - }}\) is provided by common ion effect of \(HCl\) and \(H_2S\)
PRACTICAL CHEMISTRY
37543
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is \(294\) grams, its gram equivalent weight is……grams
1 \(294\)
2 \(127\)
3 \(49\)
4 \(24.5\)
Explanation:
(c) In acidic medium potassium dicromate shows \(+ 6\) oxidation state \(\frac{M}{6} = \frac{{294}}{6} = 49\)
PRACTICAL CHEMISTRY
37544
Metallic tin in the presence of \(HCl\) is oxidise \({K_2}\) \(Cr_2O_7\) to stannic chloride. What volume of decinormal dichromate solution would be reduced by \(1 \,g \) of tin......\(ml\)
1 \(168.49\)
2 \(175.49\)
3 \(170.50\)
4 \(162.38\)
Explanation:
(a) \(0.1 \times V = \frac{2}{{119}}\) \(V = 168.06\,ml\).
PRACTICAL CHEMISTRY
37560
The reagent that can distinguish between silver and lead salt is
1 \(H_2S\) gas
2 Hot dilute \(HCl\) solution
3 \(NH_4Cl (solid) + NH_4OH (solution)\)
4 \(NH_4Cl (solid) + (NH_4)_2CO_3 solution\)
Explanation:
Hot \(HCl\) will produce precipitate of \(AgCl\) with \(Ag^+\) only. \(PbCl_2\) will not precipitate because it is soluble in hot solution.
37541
The colour of \(CuC{r_2}{O_7}\) solution in water is green because
1 \(C{r_2}O_7^{2 - }\) ions are green
2 \(C{u^{ + + }}\) ions are green
3 Both ions are green
4 \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{2 - }\) ions are yellow
Explanation:
(d) \(C{u^{ + + }}\) ions are blue and \(C{r_2}O_7^{ - - }\) ions are yellow, yellow and blue combination gives-green colour.
PRACTICAL CHEMISTRY
37542
\(P{b^{ + + }},\) \(C{u^{ + + }},\) \(Z{n^{ + + }},\) and \(N{i^{ + + }}\) ions are present in a given acidic solution. On passing hydrogen sulphide gas through this solution the available precipitate will contain
1 \(PbS\) and \(NiS\)
2 \(PbS\) and \(CuS\)
3 \(CuS\) and \(ZnS\)
4 \(CuS\) and \(NiS\)
Explanation:
(b) As both \(P{b^{2 + }}\) and \(C{u^{2 + }}\) require acidic medium and low concentration of \({S^{2 - }}\) be precipitated as sulphide and low concentration of \({S^{2 - }}\) is provided by common ion effect of \(HCl\) and \(H_2S\)
PRACTICAL CHEMISTRY
37543
In acidic medium, dichromate ion oxidises ferrous ion to ferric ion. If the gram molecular weight of potassium dichromate is \(294\) grams, its gram equivalent weight is……grams
1 \(294\)
2 \(127\)
3 \(49\)
4 \(24.5\)
Explanation:
(c) In acidic medium potassium dicromate shows \(+ 6\) oxidation state \(\frac{M}{6} = \frac{{294}}{6} = 49\)
PRACTICAL CHEMISTRY
37544
Metallic tin in the presence of \(HCl\) is oxidise \({K_2}\) \(Cr_2O_7\) to stannic chloride. What volume of decinormal dichromate solution would be reduced by \(1 \,g \) of tin......\(ml\)
1 \(168.49\)
2 \(175.49\)
3 \(170.50\)
4 \(162.38\)
Explanation:
(a) \(0.1 \times V = \frac{2}{{119}}\) \(V = 168.06\,ml\).
PRACTICAL CHEMISTRY
37560
The reagent that can distinguish between silver and lead salt is
1 \(H_2S\) gas
2 Hot dilute \(HCl\) solution
3 \(NH_4Cl (solid) + NH_4OH (solution)\)
4 \(NH_4Cl (solid) + (NH_4)_2CO_3 solution\)
Explanation:
Hot \(HCl\) will produce precipitate of \(AgCl\) with \(Ag^+\) only. \(PbCl_2\) will not precipitate because it is soluble in hot solution.
