Question

Identify the correct statements from the following
I.
All alkaline earth metals give hydrides on heating with hydrogen.
II.
Calcium hydroxide is used to purify sugar.
III.
\( \mathrm{BeCl_2} \) is a dimer in gaseous phase.

• A. I & III only
• B. II & III only
• C. I, II, III
• D. I & II only

Hint:

Remember: Beryllium compounds often form dimeric structures due to incomplete octets. Also, calcium hydroxide is known for its use in the sugar industry for purification.

Answer 1

The Correct Option is B

Step 1: Analyze Statement I
Not all alkaline earth metals form hydrides easily with hydrogen. For instance, beryllium and magnesium do not form stable hydrides under normal conditions.
Hence, Statement I is incorrect. Step 2: Analyze Statement II
Calcium hydroxide (lime water) is commonly used in the purification of sugar by removing impurities.
Thus, Statement II is correct. Step 3: Analyze Statement III
In the gaseous phase, beryllium chloride \( \mathrm{BeCl_2} \) exists as a dimer due to electron deficiency, forming a bridged structure.
Hence, Statement III is correct. Conclusion:
Only statements II and III are correct.