Which of the following is / are INCORRECTLY matched. (i) Be Li B → IE 1 order (ii) Re element belongs to → 7 th period, 7 th group (iii) Li + Al 3 + → Ionic radius order (iv) Cl Br Br −

Question

Which of the following is / are INCORRECTLY matched.

(i) $Be > Li > B \to IE_{1}$ order

(ii) Re element belongs to $\to 7^{th}$ period, $7^{th}$ group

(iii) $Li^{+} > Al^{3 +} \to$ Ionic radius order

(iv) $Cl > Br > Br^{-} > Cl^{-} \to$ IE order

(v) $Li < Na < K < Rb < Cs \to$ Density order

(vi) $CO < CO_{2} < SO_{2} < SO_{3} \to$ Acidic strength order

(vii) $\frac{Na ^{⊖}}{Na} < \frac{Li ^{⊖}}{Li} < \frac{H ^{⊖}}{H} \to$ Size ratio order

TestHub · Accepted Answer

(i) I E 1 order: The correct first ionization energy order is B e > B > L i because beryllium has a stable, fully filled 2 s 2 electronic configuration. (ii) Rhenium ( R e ): It belongs to the 6ᵗʰ period and 7ᵗʰ group, not the 7ᵗʰ period. (iv) I E order: Neutral atoms always have a higher ionization energy than their corresponding negative ions ( Cl > C l − ), making the given order wrong. (v) Density order: Due to an unusual increase in atomic volume, potassium is less dense than sodium, making the correct order L i < K < N a < R b < C s .

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