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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3sb110

Which of the following statements about halides of s-block elements are correct?

ASolid beryllium chloride is polymeric with bridging chlorides
BAnhydrous $CaCl X_{2}$ absorbs ammonia and alcohols
C $CaF X_{2}$ has the fluorite structure in which Ca2+ is 8-coordinate and F- is 4-coordinate
DNaCl crystal has 8:8 coordination

Answer: A, B, C

BeCl2 forms chains, CaF2 has 8:4 coordination, and anhydrous CaCl2 forms adducts such as

CaCl X_{2} \cdot 8 NH X_{3}

with ammonia and with alcohols. NaCl has the rock salt structure with 6:6 coordination; 8:8 is the CsCl structure.

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