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Class 12
CHEMISTRY
Among the statements (I -IV) , the corre...

Among the statements (I -IV) , the correct ones are :
(I) Be has smaller atomic radius compared to Mg.
(II) Be has higher ionization enthalpy than Al.
(III) Charge/ radius ratio of Be is greater than that of Al.
(IV) Both Be and Al form mainly covalent compounds.

A

(I) , (III) and (IV)

B

(I), (II) and (IV)

C

(I) ,(II) and (III)

D

(II), (III) and (IV)

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Knowledge Check

  • Statement I: The hydration energy of Be^(2+) is much higher as compared to that of Li^(+) . Statement II: First ionization energy of Be is greater than that of Li.

    A
    If both Statement I and Statement Il are true and Statement II is the correct explanation of Statement I.
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    C
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  • Among the followingstatements identify correct set of statements (a) size of Be is smaller than Mg (b) Ionisation energy of Be is greater than Al (c) Both Be and Al form covalent compounds readily (d) Both Be & Al does not react with nitrogen

    A
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    B
    a,c,d
    C
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    D
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    A
    `Al^(3+)` has high nuclear charge than `Mg^(2+)`
    B
    `Mg` atom has less no. of neutrons than `Al` atom
    C
    `Mg` and `Al` differ in electronegativity values
    D
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