Assertion (A): | Lithium and beryllium unlike their other respective group members form compounds with pronounced ionic character |
Reason (R): | Lithium and Magnesium have similar properties due to a diagonal relationship |
1. | (A)is true but (R) is false |
2. | (A) is false but (R) is true |
3. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
4. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
I: | Hydrated chlorides and bromides of Ca, Sr and Ba on heating undergo hydrolysis. |
II: | Hydrated chlorides and bromides of Be and Mg on heating dehydration. |
List-I | List-II | ||
(a) | Li | (i) | absorbent for carbon dioxide |
(b) | Na | (ii) | electrochemical cells |
(c) | KOH | (iii) | coolant in fast breeder reactors |
(d) | Cs | (iv) | photoelectric cell |
(a) | (b) | (c) | (d) | |
1. | (ii) | (iii) | (i) | (iv) |
2. | (iv) | (i) | (iii) | (ii) |
3. | (iii) | (iv) | (ii) | (i) |
4. | (i) | (iii) | (iv) | (ii) |
Among the role of gypsum, CaSO4.2H2O in the setting of cement, identify the correct option from the following:
1. It fastens the setting process
2. It provides water molecules for the hydration process
3. It helps to remove water molecules
4. It slows down the setting process