Consider the statements: I. SF6 is inert towards hydrolysis. II. SF4 is readily hydrolysed by water to SO2 and HF. III. OF6 does not exist because oxygen has no vacant d orbitals. IV. SF6 is hydrolysed rapidly by water at room temperature. How many of the statements are correct?

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JEE Advanced levelSingle correct optionDifficulty 3 of 3pn125

Consider the statements: I. $SF X_{6}$ is inert towards hydrolysis. II. $SF X_{4}$ is readily hydrolysed by water to $SO X_{2}$ and HF. III. $OF X_{6}$ does not exist because oxygen has no vacant d orbitals. IV. $SF X_{6}$ is hydrolysed rapidly by water at room temperature. How many of the statements are correct?

AOne
BFour
CTwo
DThree

Answer: D

SF6 is kinetically inert (the S atom is shielded by six F atoms), so I is true and IV is false. SF4 hydrolyses easily, II true. Oxygen cannot expand its octet, III true. Hence three statements are correct.

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Consider the statements: I. SFX6​ is inert towards hydrolysis. II. SFX4​ is readily hydrolysed by water to SOX2​ and HF. III. OFX6​ does not exist because oxygen has no vacant d orbitals. IV. SFX6​ is hydrolysed rapidly by water at room temperature. How many of the statements are correct?

Answer: D

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