Some Basic Concepts of Chemistry - Result Question 78

####16. Among the following, the species in which the oxidation number of an element is +6

(2000)

(a) $MnO _4^{-}$

(b) $Cr(CN) _6^{3-}$

(c) $NiF _6^{2-}$

(d) $CrO _2 Cl _2$

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Solution:

  1. Given, initial strength of acetic acid $=0.06 N$

Final strength $=0.042 N$;

Volume $=50 mL$

$\therefore$ Initial millimoles of $CH _3 COOH=0.06 \times 50=3$

Final millimoles of $CH _3 COOH=0.042 \times 50=2.1$

$\therefore$ Millimoles of $CH _3 COOH$ adsorbed $=3-2.1=0.9 mmol$



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