1. Tardigrade
  2. Question
  3. Chemistry
  4. Among the following, the best and the least H ominus ion donor, respectively, are:

Q. Among the following, the best and the least $H ^{\ominus}$ ion donor, respectively, are:

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Solution:

Correct answer is (a) Correct answer is (c)

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5. Find out the products of the reaction.

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4. The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is
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6. In water saturated air the mole fraction of water vapour is $0.02$. If the total pressure of the saturated air is $1.2\, atm$, the partial pressure of dry air is :

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[Given that $log_{10}$ 2 = 0.3010

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$ MnO _{4}^{-}+8 H ^{+}+5 e ^{-} \rightarrow Mn ^{2+}+4 H _{2} O $
$ 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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