Which of the following statements are correct? I. P ₄ molecule is very reactive because of angular strain. II. The basicity of H ₃ PO ₃ is 3 . III. In gas phase, all P - Cl bonds of PCl ₅ have same bond length. IV. In solid state, PCl ₅ exi

Question

Which of the following statements are correct? I. P ₄ molecule is very reactive because of angular strain. II. The basicity of H ₃ PO ₃ is 3 . III. In gas phase, all P - Cl bonds of PCl ₅ have same bond length. IV. In solid state, PCl ₅ exists as an ionic solid, in which anion [ PCl ₆ ]⁻ has octahedral and cation [ PCl ₄ ]⁺ has tetrahedral shape.

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Correct answer: A. I and II

(II) The basicity of H ₃ PO ₃ is 2 , this is because out of the three hydrogen atoms only two are attached to most electronegative oxygen atom and can be removed. (III) PCl ₅ structure is trigonal bipyramidal in which two axial P - Cl bonds are longer than rest three equitorial P - Cl bonds

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