can't be prepared by -
1.
2.
3.
4.
Identify the correct statements from the following:
a. | \(\mathrm{CO}_2(\mathrm{~g})\) is used as a refrigerant ice cream and frozen food. |
b. | The structure of \(\mathrm{C}_{60} \) customs12 six carbon rings and 25 five carbon rings |
c. | ZSM-5, a type of zeolite, is used to convert alcohol into gasoline. |
d. | CO is a colorless and odorless gas. |
1. | (a) and (c) only | 2. | (b) and (c) only |
3. | (c) and (d) only | 4. | (a), (c) and (d) only |
The most characteristic oxidation state for lead and tin is, respectively,:
1. +4, +2
2. +2, +4
3. +4, +4
4. +2, +2
An anion that cannot be formed by Boron is -
1.
2.
3.
4.
When silicon is boiled with caustic soda solution, the gas is evolved is-
1.
2.
3.
4. None of the above
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. | \(\mathrm{SiO}^{-}\) |
White fumes appear around the bottle of anhydrous AlCl3. This is due to -
1. Formation of Al(OH)3
2. Dimerisation of AlCl3
3. Hydrolysis of AlCl3 gives HCl gas
4. Adsorption of moisture
Hydrogen will not reduce
1. heated cupric oxide
2. heated ferric oxide
3. heated stannic oxide
4. heated aluminium oxide
Aluminium reacts with concentrated HCl and concentrated NaOH to liberate which of the following gases respectively-
1. | \(\mathrm{H}_2 ~\text{and} ~\mathrm{H}_2 \) | 2. | \(\mathrm{O}_2 ~\text{and} ~\mathrm{O}_2 \) |
3. | \(\mathrm{O}_2 ~\text{and} ~\mathrm{H}_2 \) | 4. | \(\mathrm{H}_2 ~\text{and} ~\mathrm{O}_2 \) |
The bond energy of B-F bond in is 646 kJ , while that of N-F bond in is 280 kJ . This is because
1. N is more electronegative than B
2. The atomic mass of N is higher than that of B
3. The B-F bond gets a partial double bond character due to p-p overlap
4. N has a lone pair of electrons while B does not have