Which of the following statements are correct | vedclass

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(B) $(i)$ First ionisation enthalpy of $He$ $(2372 \ kJ/mol)$ is less than the second ionisation enthalpy of $Li$ $(7298 \ kJ/mol)$. This is correct.

Vedclass · Accepted Answer

$(i), (ii), (iv), (v)$

Vedclass · Answer

(B) $(i)$ First ionisation enthalpy of $He$ $(2372 \ kJ/mol)$ is less than the second ionisation enthalpy of $Li$ $(7298 \ kJ/mol)$. This is correct.
$(ii)$ $Li$ has the highest second ionisation enthalpy because removing the second electron from $Li^+$ requires breaking the stable $1s^2$ noble gas configuration. This is correct.
$(iii)$ All transition elements are $d$-block elements,but all $d$-block elements are not transition elements (e.g.,$Zn, Cd, Hg$). This is incorrect.
$(iv)$ The letter '$J$' is the only alphabet not found in the periodic table. This is correct.
$(v)$ Francium is extremely rare,and its concentration in the Earth's crust is estimated to be $\sim 10^{-18} \ ppm$. This is correct.
Therefore,statements $(i), (ii), (iv),$ and $(v)$ are correct.

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