Lithium salts are generally hydrated because they have :
1. High polarizing power.
2. High ionization enthalpy.
3. High electronegativity.
4. Low polarizing power.
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. |
Quick lime is heated with silica to give:
1. CaSiO3
2. CaSiO4
3. CaSiO
4. Ca(SiO)3
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) |
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