Chemistry - Complete s-block Question with Solution | TestHub
Match the properties in List-I with the sets of elements in List-II and give your answer as abc, where a, b and c are the matches of P, Q and R respectively (for example, if P → 2, Q → 3 and R → 1, then your answer is 231). Use i=1, ii=2 and iii=3 when writing the code.
List-I | List-II |
|---|---|
(P) Each element in the set forms by direct combination with dihydrogen on heating. | (i) |
(Q) Do not impart a characteristic colour to the Bunsen flame | (ii) |
(R) Are stored under kerosene oil | (iii) |
Answer:
Solution:
P-iii: Calcium, strontium and barium each form a dihydride directly on heating with dihydrogen. The beryllium-magnesium set does not satisfy the property for both elements: beryllium does not react directly, although magnesium hydride can be prepared by direct hydrogenation under suitable conditions.
Q-i: Beryllium and magnesium do not give a characteristic Bunsen-flame colour because the flame does not readily excite their tightly bound electrons.
R-ii: Lithium, sodium and potassium are stored under kerosene to limit contact with air and moisture.
Thus P-iii; Q-i; R-ii gives the code 312.
