Statement-I: f0H of H2O and H2S is negative

Statement-II: TeO2 is an oxidizing agent

  1. A

    Both statements-I and II are correct

  2. B

    Statement-I is correct and statement-II is incorrect

  3. C

    Statement-I is incorrect and statement-II is correct

  4. D

    Both statements-I and II are incorrect

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    Solution:

    I) Thermal stability of H2O>H2S>H2Se>H2Te>H2Po. 

    f0H of H2O and H2S is negative indicating their high thermal stability.

    II) TeO2(Te+4) is an oxidizing agent because Te+4 has a great tendency to reduce to Te+2.

    Down the group lower oxidation states become stable.

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