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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pb146

Select the correct statement(s).

  1. A is amphoteric.
  2. B dissolves in excess aqueous ammonia as a complex.
  3. CAnhydrous fumes in moist air.
  4. DAnhydrous is a high-melting ionic solid like NaCl.

Answer: A, C

dissolves in acids and in excess NaOH (A true) but not in excess ammonia (B false). hydrolyses to HCl fumes (C true). It is largely covalent and sublimes near 453 K (D false).
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