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Q. No.What colour indicates the presence of bromide ions in the layer's test?
1.
Orange
2.
Violet
3.
Blue
4.
Green
Subtopic: Detection of Anions |
68%
Level 2: 60%+
Hints
During the borax bead test with \(\mathrm{CuSO}_4\), a blue-green colour of the bead is observed in oxidizing flame due to the formation of:
1. \(\mathrm{CuO}\)
2. \(\mathrm{Cu}\left(\mathrm{BO}_2\right)_2\)
3. \(\mathrm{Cu} \mathrm{~B02}\)
4. \(\mathrm{Cu}\)
1. \(\mathrm{CuO}\)
2. \(\mathrm{Cu}\left(\mathrm{BO}_2\right)_2\)
3. \(\mathrm{Cu} \mathrm{~B02}\)
4. \(\mathrm{Cu}\)
Subtopic: Preparation of the Organic and Inorganic compounds |
83%
Level 1: 80%+
Hints
What chemical changes occur when Mohr's salt is strongly heated?
| 1. | It decomposes into ferric oxide and ammonia gas. |
| 2. | It sublimes directly into ferrous sulfate and ammonium sulfate. |
| 3. | It forms a complex with water molecules. |
| 4. | It undergoes a reversible reaction to form ferrous hydroxide and ammonium sulfide. |
Subtopic: Preparation of the Organic and Inorganic compounds |
51%
Level 3: 35%-60%
Hints
Which of the following is a chemical property of Mohr's salt?
| 1. | It effloresces in dry air |
| 2. | It decomposes upon heating to produce sulfur dioxide gas |
| 3. | It has a density of approximately 2.22 g/cm³ |
| 4. | It is soluble in nonpolar solvents like benzene |
Subtopic: Preparation of the Organic and Inorganic compounds |
64%
Level 2: 60%+
Hints
Mark the incorrect statement regarding Mohr's salt.
1. It is soluble in water.
2. It turns blue litmus paper red.
3. It turns red litmus paper blue.
4. It gives effervescence with sodium bicarbonate evolving carbon dioxide.
1. It is soluble in water.
2. It turns blue litmus paper red.
3. It turns red litmus paper blue.
4. It gives effervescence with sodium bicarbonate evolving carbon dioxide.
Subtopic: Preparation of the Organic and Inorganic compounds |
56%
Level 3: 35%-60%
Hints
Which of the following solutions will cause Mohr's salt to precipitate out as iron (II) hydroxide?
| 1. | Hydrochloric acid | 2. | Sodium hydroxide |
| 3. | Sulphuric acid | 4. | Potassium nitrate |
Subtopic: Preparation of the Organic and Inorganic compounds |
52%
Level 3: 35%-60%
Hints
Mohr's salt is primarily used as a/an:
1. reducing agent
2. oxidizing agent
3. complexometric indicator
4. pH indicator
1. reducing agent
2. oxidizing agent
3. complexometric indicator
4. pH indicator
Subtopic: Preparation of the Organic and Inorganic compounds |
51%
Level 3: 35%-60%
Hints
When potash alum reacts with sodium hydroxide, what is formed?
1. Aluminum hydroxide
2. Aluminum oxide
3. Aluminum sulfate
4. Aluminum carbonate
1. Aluminum hydroxide
2. Aluminum oxide
3. Aluminum sulfate
4. Aluminum carbonate
78%
Level 2: 60%+
Hints
Mark the correct option regarding the preparation of double salt:
| Assertion (A): | Equimolar quantities of reacting compounds are used in the preparation of double salts. |
| Reason (R): | The properties of the individual cation or anion do not change in double salts when it gets dissociated. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Preparation of the Organic and Inorganic compounds |
51%
Level 3: 35%-60%
Hints
Which of the following ions is responsible for the acidic nature of a solution of potash alum?
| 1. | \(Al^{3+}\) | 2. | \(K^+\) |
| 3. | \(SO^{2-}_4\) | 4. | \(OH^-\) |
Subtopic: Preparation of the Organic and Inorganic compounds |
Level 3: 35%-60%
Hints
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