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Answer the following :

(a) Arrange the following hydrides of Group 16 elements in the decreasing order of their acidic strength :

$H_2O,H_2S,H_2Se,H_2Te$

(b) Which one of   $PCl_4^+$ and   $PCl_4^-$ is not likely to exist and why ?

(c) Which allotrope of sulphur is thermally stable at room temperature ?

(d) Write the formula of a compound of phosphorus which is obtained when conc. $H\!N\!O_3$ oxidises   $P_4$ .

(e) Why does   $PCl_3$ fume in moisture ?

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