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Mg^(2+) ion more highly hydrated than Na...

`Mg^(2+)` ion more highly hydrated than `Na^(+)` ion.

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The extents of hydration depends upon the charge density . `Mg^(2+)` ion is smaller ihn size than `Na^(+)` and has twice the charge than that of `Na^(+)` . Hence , `Mg^(2+)` has higher charge density than `Na^(+)` and therefore , is heavily hydrated .
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Knowledge Check

  • Consider the following statements and choose the CORRECT statement . (i) Cs^(+) ion is more highly hydrated than other alkali metal ions. (ii)Among the alkali metals , only lithium forms a stable nitride by direct combination with nitrogen . (iii)Among alkali metal Li , Na ,K , Rb , the metal ,Rb has the highest melting point (iv) Among alkali metals Li, Na , K , Rb , only Li forms peroxide when heated with oxygen , (iv)

    A
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    B
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    D
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  • lyophilic sols are more stable than lyophobic sols . (r) Lyophilic sols are highly hydrated in the solution.

    A
    IF both (A) and (r) are correct and (r) is the correct explanation for (a).
    B
    If both (a) and (r) are correct but (r) is not the correct explanation for (a).
    C
    IF (a) is correct but (r) is incorrect.
    D
    If (a) is incorrect but (r) is correct.

  • Assertion (A) : Fe^(3+) (g) ion is more stable than Fe^(2+)(g) ion. Reason (R) : Fe^(3+) ion has more number of unpaired electrons than Fe^(2+) ion.

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    Both A and R true and R is the correct explanation of A
    B
    Both A and R are true but R is not a correct explanation of A
    C
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    D
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