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Equilibrium
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18/10/2021 2:32 pm
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Equimolar solutions of the following compounds are prepared separately in water. Which will have the lowest pH value?
(a) BeCl2
(b) SrCl2
(c) CaCl2
(d) MgCl2
1 Answer
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18/10/2021 2:39 pm
Correct answer: (a) BeCl2
Explanation:
Metal halide on hydrolysis with water form corresponding hydroxides. The basic strength of hydroxide increases as we move down in a group. This is because of the increase in size which results in decrease of ionization energy which weakens the strength of M – O bonds in MOH and thus increases the basic strength.
Be(OH)2 Mg(OH)2
Amphoteric Weak base
Ca(OH)2 Sr(OH)2 Ba(OH)2
Strong base
Hence, Be(OH)2 will have lowest pH.
This post was modified 3 years ago by Mayank1444