4. How many electrons should X2H4 liberate so that in the new compound X shows oxidation number of -1/2 ( E.N. X > H) 1) 10 2) 4 3) 3 4) 2

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Q. How many electrons should

X_{2} H_{4}

liberate so that in the new compound X shows oxidation number of -1/2?

(E, N . X > H)

Q. How many electrons should

X_{2} H_{4}

liberate so that in the new compound

X

shows an oxidation number of

- \frac{1}{2}

[E.N.:

X

>

H

]

Q. How many of the following compounds liberate

N H_{3}

on heating?

(N H_{4})_{2} S O_{4}, (N H_{4})_{2} C O_{3}, N H_{4} C l, N H_{4} N O_{3}, (N H_{4})_{2} C r_{2} O_{7}, (N H_{4})_{2} C_{2} O_{4}

A mole of $N_{2} H_{4}$ loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation number of hydrogen.)

Q. In the reaction

{C r}_{5} + H_{2} {S O}_{4} \to {C r}_{2} ({S O}_{4})_{3} + H_{2} O + O_{2}

one mole of

{C r O}_{5}

will liberate how many moles of

O_{2}

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