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  • Please help! In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

  • Option 1)

     HF< HCI< HBr< HI : increasing acidic strength

  • Option 2)

    H_{2}O< H_{2}S< H_{2}Se< H_{2}Te : increasing pK_{a} values

  • Option 3)

    NH_{3}< PH_{3}< AsH_{3}< SbH_{3} : increasing acidic character 

  • Option 4)

    CO_{2}< SiO_{2}< SnO_{2}< PbO_{2} : increasing oxidising power

 

Answers (1)

best_answer

 

Reducing power and acidic nature of hydrides of oxygen family -

Follows the following trend 

H2O< H_{2}S< H_{2}Se< H_{2}Te

-

 

  Acidic nature of hydrides of oxygen family:

H_{2}Te> H_{2}S_{e}> H_{2}S> H_{2}O

The higher the acidic nature, higher the Ka value and Sa leuur will lu the PK_{a} value

 \therefore pKa value trend.

H_{2}O< H_{2}S< H_{2}Se< H_{2}Te


Option 1)

 HF< HCI< HBr< HI : increasing acidic strength

Incorrect

Option 2)

H_{2}O< H_{2}S< H_{2}Se< H_{2}Te : increasing pK_{a} values

Correct

Option 3)

NH_{3}< PH_{3}< AsH_{3}< SbH_{3} : increasing acidic character 

Incorrect

Option 4)

CO_{2}< SiO_{2}< SnO_{2}< PbO_{2} : increasing oxidising power

Incorrect

Posted by

prateek

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