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Statement Na(2)OltMgOltZnOltP(4)O(6)- ...

Statement
`Na_(2)OltMgOltZnOltP_(4)O_(6)-` Acidic Property `FgtC1gt` Br-Electron gain enthalpy `M^(2-)gt M^(-)gtM^(+)gt M^(2+)-"ionic size"` The second ionisation enthalpy of Cu is more than second ionisation enthalpy of K. Which of the following if the correct representation of True (T)/False (F) for the given statement ?

A

`{:(i, ii, iii,iv),(T,T,F,F):}`

B

`{:(i, ii, iii,iv),(F,T,F,T):}`

C

`{:(i, ii, iii,iv),(F,F,F,T):}`

D

`{:(i, ii, iii,iv),(T,F,T,F):}`

Text Solution

Verified by Experts

The correct Answer is:
D
(i) Acidic property increases with the increase in oxidation number of the central atom ( element ) and for same oxidation number acidic nature increases along the period (according to long form periodic table) . So, this statement is correct. (ii) Electro gain enthalpy for Cl is more (-) ve than of F ( due to extremely small size of F-atom ) and electron gain enthalpy for Br-atom is less (-) ve than of Cl-atom (due to its larger size). Hence, the statement in false.
(iii) If any ion accept the electron, ionic size will increase and if the electron will donate then ionic size will reduces.
So, the ionic size order will be
`M^(2-)gt M^(-)gt M^(+)gt M^(2+)`.
Thus, this statement is correct.
(iv) For 2nd I.E, the electron is removed from `M^(+)` ion.
`because K^(+)` has full-filled noble gas configuration while
`Cu^(+)` has full-filled `d^(10)` configuration and K has no d-subshell. Thus, 2nd I.E for `K^(+)` is more than of `Cu^(+)` ion.
Hence, statement (iv) is false.
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