Q. No.Mellitic acid is formed by the oxidation of graphite with -
1. Chromic acid
2. Alkaline
3. Fuming
4. dil.
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Select the correct statement(s) regarding the following reaction sequence:
1. The compound (A) is
2. The compound D is SiC
3. The compound (B) is
4. All of the above
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Carbogen is:
1. A mixture of .
2. Used by pneumonia patients for respiration.
3. Used by victims of for respiration.
4. All of the above.
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The sharp decrease in ionization enthalpy from carbon to silicon happens because of-
| 1. | Decrease in the charge of elements upon moving down the group. |
| 2. | Decrease in the atomic sizes of elements upon moving down the group. |
| 3. | Increase in the atomic sizes of elements upon moving down the group. |
| 4. | Increase in the charge of elements upon moving down the group. |
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The basic structural unit of silicates is-
| 1. | \( \mathrm{SiO}_4{}^{4-}\) | 2. | \(\left(\mathrm{SiO}_3\right)^{2-} \) |
| 3. | \(\mathrm{SiO}_4{ }^{2-} \) | 4. | \(\mathrm{SiO}^{-}\) |
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The incorrect statement among the following options is:
| 1. | Conc. HNO3 can be transported in an aluminium container. |
| 2. | Diamond is used as an abrasive. |
| 3. | A mixture of dilute NaOH and aluminium pieces is used to declog the drain. |
| 4. | Graphite can't be used as a lubricant. |
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Find the species that does not exist among the following.
1. [SnF₆]²⁻2. [GeCl₆]²⁻
3. [CCl₆]²⁻
4. [SiF₆]²⁻
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The reason behind carbon showing catenation property but lead does not is:
1. Due to the smaller size of C than that of Pb
2. Due to the smaller size of Pb than that of C
3. Due to the smaller ionization energy of C than that of Pb
4. Due to the inert pair effect
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