JEE PYQ: S Block Elements Question 1
Question 1 - 2021 (16 Mar Shift 1)
Given below are two statements:
Statement I: Both $\text{CaCl}_2 \cdot 6\text{H}_2\text{O}$ and $\text{MgCl}_2 \cdot 8\text{H}_2\text{O}$ undergo dehydration on heating.
Statement II: BeO is amphoteric whereas the oxides of other elements in the same group are acidic.
In the light of the above statements, choose the correct answer from the options given below:
(a) Statement I is false but statement II is true (b) Both statement I and statement II are false (c) Both statement I and statement II are true (d) Statement I is true but statement II is false
Show Answer
Answer: (b)
Solution
$\text{CaCl}_2 \cdot 6\text{H}_2\text{O} \xrightarrow{\Delta} \text{CaCl}_2 + 6\text{H}_2\text{O}$ (dehydration). $\text{MgCl}_2 \cdot 8\text{H}_2\text{O} \xrightarrow{\Delta} \text{MgO} + 2\text{HCl} + 6\text{H}_2\text{O}$ (hydrolysis, not dehydration). BeO is amphoteric, but the oxides of other elements in the same group (MgO, CaO, SrO, BaO) are all basic, not acidic. Both statements are false.
BETA
