The P Block Elements - Result Question 38

####39. Which is the correct thermal stability order for H2E(E=O,S,Se,Te and Po) ?

[2019]

(a) H2S<H2O<H2Se<H2Te<H2Po

(b) H2O<H2S<H2Se<H2Te<H2Po

(c) H2Po<H2Te<H2Se<H2S<H2O

(d) H2Se<H2Te<H2Po<H2O<H2S

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Solution:

  1. (c) On going down the group, bond dissociation enthalpy of the hydrides of oxygen family decreases. Therefore, thermal stability also decreases.


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