Question:

Which of the following statements are not correct? i) \( \text{BeO has rock-salt structure} \)
ii) \( \text{BeSO}_4 \text{ is readily soluble in water} \)
iii) \( \text{The maximum coordination number of beryllium is four} \)
iv) \( \text{Be(OH)}_2 \text{ is basic in nature} \)

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- BeO forms a rock-salt structure, which is typical for many oxides. - Beryllium sulfate (BeSO\(_4\)) is not highly soluble in water, unlike other alkali and alkaline earth metal sulfates. - Beryllium exhibits a coordination number of 6 due to its smaller ionic radius and high charge density.
Updated On: Mar 17, 2025
  • ii, iii only
  • ii, iii, iv
  • i, iv only
  • iii, iv only
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The Correct Option is B

Solution and Explanation


Step 1: Let's analyze the statements: % Option (A) BeO indeed has a rock-salt structure, so statement i is correct. % Option (B) BeSO\(_4\) is actually poorly soluble in water, so statement ii is incorrect. % Option (C) The maximum coordination number of beryllium is 6, not 4, so statement iii is incorrect. % Option (D) Be(OH)\(_2\) is basic in nature, which is true, so statement iv is correct. Thus, the incorrect statements are ii, iii, and iv. Therefore, the correct answer is option (2).
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