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Standard XII

Chemistry

Van't Hoff Factor

An oxide X2O3...

Question

An oxide X2O3 is oxidised to XO4(-) by Cr2O7(2-) in acidic medium. The no of moles of X2O3 oxidised per mole of dichromate ion is 1. 2 2. 3/4 3. 3/2 4. None

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Q. Dichromate ion in acidic medium oxidises stannous ion as :

x S n^{2 +} + y C r_{2} O_{7}^{2 -} + z H^{+} \to a S n^{4 +} + b C r^{3 +} + c H_{2} O

M n O_{4}^{-}

in basic medium oxidises

N O_{2}^{-}

N O_{3}^{-}

. How many moles of

N O_{2}^{-}

will be oxidised by

1

mole of

M n O_{4}^{-} ?

1

mole of

F e C_{2} O_{4}

is oxidised by

x

moles of

{C r}_{2} O_{7}^{2 -}

in acidic medium,

x

is:

{N H}_{3}

is oxidised to

N O

O_{2}

(air) in basic medium. Number of equivalents of

{N H}_{3}

oxidised by

1

mole of

O_{2}

is :

When the ion ${C r}_{2} O_{7}^{2 -}$ acts as an oxidant in acidic aqueous solution the ion ${C r}^{3 +}$ is formed. How many moles of ${S n}^{2 +}$ would be oxidised to ${S n}^{4 +}$ by one mole of ${C r}_{2} O_{7}^{2 -}$ ions?

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