Q. Sulphur on boiling with $NaOH$ solution gives

The p-Block Elements - Part2 Report Error

A

$Na _{2} S _{2} O _{3}+ NaHSO _{3}$

B

$Na _{2} S _{2} O _{3}+ Na _{2} S$

C

$Na _{2} SO _{3}+ H _{2} S$

D

$Na _{2} SO _{3}+ SO _{2}$

Solution:

$3 S+4 NaOH \xrightarrow{\text { boiling }}Na _{2} S _{2} O _{3}+ Na _{2} S$

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5. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
[Given that molecular mass of NaOH = 40 g mol$^{-1}$]

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$ E _{ Mn ^{2+} / MnO _{4}^{-}}^{\circ}=-1.510\, V$
$\frac{1}{2} O _{2}+2 H ^{+}+2 e ^{-} \rightarrow H _{2} O ,$
$ E _{ O _{2} / H _{2} O }^{\circ}=+1.223 \,V$
Will the permanganate ion, $MnO _{4}^{-}$liberate $O _{2}$ from water in the presence of an acid ?

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$\lambda^{o}_{m}\left(K_{2}SO_{4}\right) = y S\,cm^{2} mol^{-1}$
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the number of sigma(s) bonds present in the product A is :-

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