Given below are two statements : Statement I : Elements 'X' and 'Y' are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides X2O3 and Y2O3 is acidic and amphoteric, respectively. Statement II : BCl3 is covalent in nature and gets hydrolysed in water. It produces [B(OH)4]− and [B(H2O)6]3+ in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :

Elements electronegativity oxides nature and hydrolysis of BCl3

Q. Given below are two statements :

Statement I : Elements 'X' and 'Y' are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides X₂O₃ and Y₂O₃ is acidic and amphoteric, respectively.

Statement II : BCl₃ is covalent in nature and gets hydrolysed in water. It produces [B(OH)₄]⁻ and [B(H₂O)₆]³⁺ in aqueous medium.

In the light of the above statements, choose the correct answer from the options given below :

A. Statement I is false but Statement II is true

B. Statement I is true but Statement II is false

C. Both Statement I and Statement II are false

D. Both Statement I and Statement II are true

Correct Answer: Statement I is true but Statement II is false

Explanation

Among N, P, As and Sb, electronegativity decreases down the group. Nitrogen is the most electronegative element and antimony is the least electronegative element.

Oxide of nitrogen, N₂O₃, is acidic in nature, whereas Sb₂O₃ shows amphoteric behaviour. Hence, Statement I is correct.

BCl₃ is covalent and undergoes hydrolysis in water, but it does not produce [B(H₂O)₆]³⁺. Boron forms boric acid and subsequently [B(OH)₄]⁻ in basic medium.

Therefore, Statement II is incorrect.

Explanation

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