Q. No.Which of the following pairs of ions would be expected to form a precipitate when dilute solutions are mixed?
(a) \(\mathrm{NH}_4{ }^+,\left[\mathrm{Co}\left(\mathrm{NO}_2\right)_6\right]^{3-}\)
(b) \(\mathrm{NH}_4{ }^{+}, \mathrm{CO}_3{ }^{2-} \)
(c) \(\mathrm{Fe}^{3 +}, \mathrm{OH}^{-} \)
(d) \(\mathrm{Ba}^{2+}, \mathrm{SO}_4^{2-}\)
1. (a), (b),(c)
2. (a), (c), (d)
3. (a), (b)
4. None of the above
Subtopic: Detection of Cations |
55%
Please attempt this question first.
Hints
Salt (A) on heating gives a colourless neutral gas that supports combustion. It can be concluded, based on the diagram given above that compound (A) contains the acid radical:
1. \(\mathrm{NO}_2^{-} \)
2. \(\mathrm{NO}_3^{-} \)
3. \(\mathrm{Br}^ - \)
4. \(\mathrm{SO}_3{ }^{2-}\)
Subtopic: Detection of Anions |
58%
Please attempt this question first.
Hints
Salt (A) on heating gives a colourless neutral gas that supports combustion. It can be concluded, based on the diagram given above that the correct statement(s) among the following is/are:
1. Salt (A) gives a yellow precipitate with chloroplatinic acid as well as with sodium cobaltinitrite.
2. The brown ring is formed due to the formation of nitroso ferrous sulphate \([\mathrm{Fe}(\mathrm{NO})]^{2+} \mathrm{SO}_4^{-}\)
3. Salt ‘C’ reacts with silver nitrate solution to form a white precipitate.
4. (A) and (B) both.
Subtopic: Detection of Anions |
64%
Please attempt this question first.
Hints
Which of the following gives foul-smelling gas with the smell of rotten eggs with dil. \(H_2SO_4\)?
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
1. \(CO^{2-}_3\)
2. \(SO^{2-}_3\)
3. \(S^{2-}\)
4. \(NO^-_2\)
Subtopic: Detection of Anions |
77%
Please attempt this question first.
Hints
Subtopic: Detection of Anions |
85%
Please attempt this question first.
Hints
A substance on treatment with dil. \(H_2SO_4\) liberates a colourless gas that produces
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
(i) turbidity with baryta water
(ii) turns acidified dichromate solution green
The reaction indicates the presence of:
1. \(CO^{2-}_3\)
2. \(S^{2-}\)
3. \(SO^{2-}_3\)
4. \(NO^{-}_2\)
Subtopic: Detection of Anions |
Please attempt this question first.
Hints
When a mixture of solid NaCl, solid \(K_2Cr_2O_7\) is heated with conc. \(H_2SO_4\), orange red vapours are obtained.
The chemical name of red vapour is:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
The chemical name of red vapour is:
1. Chromous chloride
2. Chromyl chloride
3. Chromic chloride
4. Chromic sulphate
Subtopic: Detection of Cations |
86%
Please attempt this question first.
Hints
An aqueous solution contains the ions as \(Hg^{2+}_2 , Hg^{2+}, Pb^{2+}~ \text {and} ~Cd^{2+}\). The addition of dilute HCl (6N) precipitates:
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
1. \(Hg_2Cl_2 \) only
2. \(PbCl_2\) only
3. \(PbCl_2\) and \(HgCl\)
4. \(HgCl_2\) and \(PbCl_2\)
Subtopic: Detection of Cations |
56%
Please attempt this question first.
Hints
Which of the following salt is insoluble in hot and dilute \(HNO_3\)?
1. HgS
2. PbS
3. CuS
4. CdS
1. HgS
2. PbS
3. CuS
4. CdS
Subtopic: Detection of Cations |
Please attempt this question first.
Hints
The compound that is not soluble in acetic acid is:
1. Calcium oxide
2. Calcium carbonate
3. Calcium oxalate
4. Calcium hydroxide
1. Calcium oxide
2. Calcium carbonate
3. Calcium oxalate
4. Calcium hydroxide
Subtopic: Detection of Cations |
55%
Please attempt this question first.
Hints
© 2024 GoodEd Technologies Pvt. Ltd.