Beryllium and Magnesium do not impart color in flame test, because -
1. Be and Mg have high Ionization Energy.
2. Be and Mg have low Ionization Energy.
3. Be and Mg radiate energy in the Infra-Red region.
4. Be and Mg have a high radius.
Potassium carbonate cannot be prepared by the Solvay process because -
| 1. | Potassium carbonate is insoluble in water and does not precipitate out. |
| 2. | Potassium carbonate is soluble in water and does not precipitate out. |
| 3. | Potassium carbonate is soluble in water and does precipitate out. |
| 4. | Potassium carbonate is insoluble in water and does precipitate out. |
The hydroxides and carbonates of sodium and potassium are easily soluble in water while the corresponding salts of magnesium and calcium are sparingly soluble in water because -
1. Lattice energies of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.
2. Lattice energies of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.
3. Enthalpy of carbonates and hydroxides formed by calcium and magnesium are much more than those of sodium and potassium.
4. Enthalpy of carbonates and hydroxides formed by sodium and potassium are much more than those of calcium and magnesium.
Lithium salts are generally hydrated because they have :
1. High polarizing power.
2. High ionization enthalpy.
3. High electronegativity.
4. Low polarizing power.
LiF is almost insoluble in water whereas LiCl is soluble in water and acetone both, because of:
| 1. | Greater covalent character of LiCl as compared to LiF. |
| 2. | Greater hydration energy of LiF as compared to LiCl. |
| 3. | Greater size of LiF as compared to LiCl. |
| 4. | Greater lattice energy of LiF as compared to LiCl. |
The incorrect reaction among the following is:
| 1. | Na2O2(s) + 2H2O(l) → 2NaOH(aq) + H2O2(g) |
| 2. | 2KO2(s) + 2H2O(l) → 2KOH(aq) + H2O2(aq) + O2(g) |
| 3. | Na2O(s) + CO2(g) → NaHCO3 (s) + H2O2(aq) |
| 4. | Na2O(s) + CO2(g) → Na2CO3 (s) |
The incorrect statement among the following regarding alkaline earth metals is :
| 1. | Alkaline earth metals are silvery-white, lustrous, and harder than alkali metals. |
| 2. | Only Ca, Sr, Mg, and Ba give a flame test. |
| 3. | Alkaline earth metals have high electrical, and thermal conductivities. |
| 4. | All alkaline earth metals react with halogen and form metal halides, with the general formula MX2 . |
The incorrect statement among the following is-
| 1. | Ionisation enthalpy of alkaline earth metals is higher than alkali metals. |
| 2. | Alkaline earth metal oxides are more basic than alkali metal oxides. |
| 3. | Alkaline earth metal hydroxides are less basic and less stable than alkali metal hydroxides. |
| 4. | Solubility of Alkaline earth metals and alkali metal hydroxide increases down the group. |
Why can alkali and alkaline earth metals not be obtained by chemical reduction methods?
1. They are a strong reducing agent
2. They are a strong oxidizing agent
3. Their compounds are nonreactive in nature.
4. None of these
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