Q. No.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.
The correct statement(s) among the following options is/are:
| 1. | BeO is almost insoluble but BeSO4 is soluble in water. |
| 2. | BaO is soluble but BaSO4 is insoluble in water. |
| 3. | LiI is more soluble than KI in ethanol. |
| 4. | All of the above. |
Match the following:
| Element | Biological Significance |
| (a) Sodium | (i) Oxidation of glucose to produce ATP. |
| (b) Potassium | (ii) Helps in transporting sugars and amino acids into the cells. |
| (c) Magnesium | (iii) Helps in the coagulation of blood. |
| (d) Calcium | (iv) Helps in building and strengthening bones. |
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (i) | (iv) | (iii) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (iv) | (ii) | (i) | (iii) |
| 4. | (iii) | (i) | (iv) | (iii) |
Lithium salts are generally hydrated because they have :
1. High polarizing power.
2. High ionization enthalpy.
3. High electronegativity.
4. Low polarizing power.
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. |
Alkali and alkaline earth metals cannot be obtained by chemical reduction method because they are the strongest :
1. Oxidizing agents.
2. Reducing agents.
3. Hydrating agents.
4. Drying agents.
The correct statement(s) about the structure of BeCl2 is -
a. BeCl2 (solid)- exists as polymer.
b. BeCl2 (vapour)- exists as chlorobridged dimer.
c. BeCl2 has bent structure in the vapour phase.
1. a
2. a & b
3. b
4. b & c
Be and Mg did not give flame colour because:
1. Energy released by excited electron falls in visible region.
2. Energy released by excited electron does not fall in visible region
3. s-s transition.
4. Charge transfer.
An alkali metals that forms only the normal oxide M2O on heating in air is-
1. Rb
2. K
3. Li
4. Na
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