Q. No.Generally transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds will be coloured in solid state?
1. Ag2SO4
2. CuF2
3. ZnF2
4. Cu2Cl2
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On addition of small amount of KMnO4 to concentrated H2SO4, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following.
1. Mn2O7
2. MnO2
3. MnSO4
4. Mn2O3
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
1. 3d7
2. 3d5
3. 3d8
4. 3d2
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When KMnO4 solution is added to oxalic acid solution, the decolourisation is slow in the beginning but becomes instantaneous after some time because
1. CO2 is formed as the product.
2. Reaction is exothermic.
3. MnO4– catalyses the reaction.
4. Mn2+ acts as autocatalyst.
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There are 14 elements in actinoid series. Which of the following elements does not belong to this series?
1. U
2. Np
3. Tm
4. Fm
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Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of metals. Which of the following is not the characteristic property of interstitial compounds?
1. They have high melting points in comparison to pure metals.
2. They are very hard.
3. They retain metallic conductivity.
4. They are chemically very reactive.
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Which of the following statements does not hold true?
| 1. | Copper liberates hydrogen from acids. |
| 2. | In its higher oxidation states, manganese forms stable compounds with oxygen and fluorine. |
| 3. | Mn3+ and Co3+ are oxidising agents in aqueous solution. |
| 4. | Ti2+ and Cr2+ are reducing agents in aqueous solution. |
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The reason for not utilizing HCl to acidify the medium in oxidation reactions involving KMnO4 (in an acidic environment) is:
| 1. | Both HCl and KMnO4 act as oxidizing agents. |
| 2. | KMnO4 oxidizes HCl into Cl2 which is also an oxidizing agent. |
| 3. | KMnO4 is a weaker oxidizing agent than HCl. |
| 4. | KMnO4 acts as a reducing agent in the presence of HCl. |
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