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Standard XII

Chemistry

Scales of Electronegativity

Consider the ...

Question

Consider the following ionisation reactions:
I.E. $(k J {m o l}^{- 1})$
$A_{(g)} \to A_{(g)}^{+} + e^{-}, A_{1}$
$B_{(g)}^{+} \to B_{(g)}^{2 +} + e^{-}, B_{2}$
$C_{(g)}^{+} \to C_{(g)}^{2 +} + e^{-}, C_{2}$
$B_{(g)} \to B_{(g)}^{+} + e^{-}, B_{1}$
$C_{(g)} \to C_{(g)}^{+} + e^{-}, C_{1}$
$C_{(g)}^{2 +} \to C_{(g)}^{3 +} + e^{-}, C_{3}$
If monovalent positive ion of A, divalent positive ion of B and trivalent positive ion of C have zero electron. Then incorrect order of corresponding I.E. is :

C_{3} > B_{2} > A_{1}

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B_{1} > A_{1} > C_{1}

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C_{3} > C_{2} > B_{2}

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B_{2} > C_{3} > A_{1}

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Solution

The correct option is B $B_{1} > A_{1} > C_{1}$
Option B showing incorrect order of corresponding $I . E$ because $1^{s t}$ ionisation of $B$ is not greater than $A$ and $C$ .

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and

a_{3} = l c m (b_{2}, c_{2}), b_{3} = l c m (c_{2}, a_{2}), c_{3} = l c m (a_{2}, b_{2}) .

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| a_{1} | > | a_{2} | + | a_{3} |, | b_{2} | > | b_{1} | + | b_{3} |

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∣ ∣ ∣ ∣ \begin{matrix} a_{1} & a_{2} & a_{3} b_{1} & b_{2} & b_{3} c_{1} & c_{2} & c_{3} \end{matrix} ∣ ∣ ∣ ∣ = 0

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(a_{1}, a_{2}, a_{3})

(b_{1}, b_{2}, b_{3})

and

(c_{1}, c_{2}, c_{3})

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x (a_{1}, a_{2}, a_{3}) + y (b_{1}, b_{2}, b_{3}) + z (c_{1}, c_{2}, c_{3}) = 0

then

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The correct option is B B1>A1>C1Option B showing incorrect order of corresponding I.E because 1st ionisation of B is not greater than A and C.

The correct option is B $B_{1} > A_{1} > C_{1}$
Option B showing incorrect order of corresponding $I . E$ because $1^{s t}$ ionisation of $B$ is not greater than $A$ and $C$ .