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Q.

Consider the following trends of second group metal hydroxides. Identify the correct trend

I= Solubility ; II = Thermal stability ; III = Basic strength

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a

I and II increases down the group whereas III decreases down the group

b

I, II and III decreases down the group

c

I increases down the group whereas II and III decreases down the group

d

I, II and III increases down the group

answer is C.

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Detailed Solution

  • Solubility of hydroxides increases

 Be(OH)2​ <Mg(OH)2​ <Ca(OH)2​<Sr(OH)2​<Ba(OH)2​

  • On moving down the group, the lattice enthalpy increases and the thermal stability increases.

 Be(OH)2​ <Mg(OH)2​ <Ca(OH)2​<Sr(OH)2​<Ba(OH)2​

  • The basicity of alkaline earth metal hydroxides increases down the group.

Be(OH)2​ <Mg(OH)2​ <Ca(OH)2​<Sr(OH)2​<Ba(OH)2​

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