Consider the total number of correct statements/orders among the following: (1) Ionization energy order: B T ℓ Ga A ℓ In (2) Acidic strength order: N 2 O 3

Question

Consider the total number of correct statements/orders among the following:

(1) Ionization energy order: $B > T ℓ > Ga > A ℓ > In$

(2) Acidic strength order: $N_{2} O_{3} < NO_{2} < N_{2} O_{5}$

(3) Electronegativity order: $B > Al > Ga > In > T ℓ$

(4) Atomic radius order: $Zr > Hf$

(5) Lattice energy order: $NaF > MgF_{2} > AlF_{3}$

(6) Among oxides, CO is neutral, GeO is acidic, and SnO is amphoteric.

(7) The ionic radius of $H^{-}$ is smaller than $Br^{-}$ .(isolated gaseous ion)

TestHub · Accepted Answer

(1) Ionization energy order: B > Tl > Ga > Al > In. This order is correct due to poor shielding in Ga and Tl.

(2) Acidic strength order: N₂O₃ < NO₂ < N₂O₅. This is correct; acidic strength increases with the oxidation state of nitrogen.

(3) Electronegativity order: B > Al > Ga > In > Tl. This is incorrect. The correct order is B > Tl > In > Ga > Al.

(4) Atomic radius order: Zr > Hf. This is incorrect. Due to lanthanoid contraction, Zr $\approx$ Hf.

(5) Lattice energy order: NaF > MgF₂ > AlF₃. This is incorrect. Lattice energy increases with charge density: AlF₃ > MgF₂ > NaF.

(6) Among oxides, CO is neutral, GeO is acidic, and SnO is amphoteric. This is correct.

(7) The ionic radius of H⁻ is smaller than Br⁻. This is incorrect.

Therefore, statements (1), (2), and (6) are correct.

Total number of correct statements = 3.

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