Which of the following statements is not correct?

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Beryllium halides are covalent in nature and undergo hydrolysis

Beryllium chloride in vapour, liquid and solid phases exists either as monomer or dimer

The halides of Ca, Sr and Ba are essentially ionic

The halides of Mg and Ca are hygroscopic

answer is B.

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Detailed Solution

Be2+ ion has small size and high charge. Hence, it has high polarizing power and forms covalent compounds. Other alkaline earth metals form ionic compounds.

Are Ca Sr and Ba are alkali metals?

Group 2A (or IIA) of the periodic table are the alkaline earth metals: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

The alkaline earth metals are the elements that correspond to group 2 of the modern periodic table. This group of elements includes beryllium, magnesium, calcium, strontium, barium, and radium. The elements of this group are quite similar in their physical and chemical properties

BeCl(2) exists as dimer in the vapour state and polymeric in the solid state

Beryllium chloride vapour contains ${BeCl}_{2}$ but the solid is a polymer with a chain structure.

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