$\mathrm{H}_{2} \mathrm{E}(\mathrm{E}=\mathrm{O}, \mathrm{S}, \mathrm{Se}, Te$ અને $Po)$ માટે સાચો ઉષ્મીય સ્થિરતાનો ક્રમ નીચે આપેલામાંથી શોધો.

Q: $\mathrm{H}_{2} \mathrm{E}(\mathrm{E}=\mathrm{O}, \mathrm{S}, \mathrm{Se}, Te$ અને $Po)$ માટે સાચો ઉષ્મીય સ્થિરતાનો ક્રમ નીચે આપેલામાંથી શોધો.

c $\mathrm{H}_{2} \mathrm{O} \quad \mathrm{H}_{2} \mathrm{S} \quad \mathrm{H}_{2} \mathrm{Se} \quad \mathrm{H}_{2} \mathrm{Te} \quad \mathrm{H}_{2} \mathrm{Po}$ $\xrightarrow{\;\quad \quad \quad \;}$ Size of central atom increases, thermal stability decreases

Question

A$\mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po}$
B$\mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po}$
C$\mathrm{H}_{2} \mathrm{Po} < \mathrm{H}_{2} Te < \mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{S} < \mathrm{H}_{2} \mathrm{O}$
D$\mathrm{H}_{2} \mathrm{Se} < \mathrm{H}_{2} \mathrm{Te} < \mathrm{H}_{2} \mathrm{Po} < \mathrm{H}_{2} \mathrm{O} < \mathrm{H}_{2} \mathrm{S}$

NEET 2019, Medium

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Solution

c
$\mathrm{H}_{2} \mathrm{O} \quad \mathrm{H}_{2} \mathrm{S} \quad \mathrm{H}_{2} \mathrm{Se} \quad \mathrm{H}_{2} \mathrm{Te} \quad \mathrm{H}_{2} \mathrm{Po}$

$\xrightarrow{\;\quad \quad \quad \;}$ Size of central atom increases, thermal stability decreases

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