Given below are two statements:
Assertion (A): | The carbonate of lithium decomposes easily on heating to form lithium oxide and CO2. |
Reason (R): | Lithium being very small in size polarises large carbonate ions leading to the formation of more stable Li2O and CO2. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
Given below are two statements:
Assertion (A): | Beryllium carbonate is kept in the atmosphere of carbon dioxide. |
Reason (R): | Beryllium carbonate is unstable and decomposes to give beryllium oxide and carbon dioxide. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | (A) is false but (R) is true. |
The alkali metal that reacts with water least vigorously is -
1. Li
2. Na
3. K
4. Cs
Which of the carbonates given below is unstable in air and is kept in CO2 atmosphere to avoid decomposition?
1.
2.
3.
4.
Some of the Group 2 metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
1. BeCl2
2. MgCl2
3. CaCl2
4. SrCl2
Which of the following elements does not form hydride by direct heating with dihydrogen?
1. Be
2. Mg
3. Sr
4. Ba