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Q.

What mass of N2H4 can be oxidized to N2 by 24 g of K2CrO4 which is reduced to CrOH4- ?

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a

2.969 g

b

5.25 g

c

9.08 g

d

29.69 g

answer is A.

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Detailed Solution

N-22H4→N02 ; change in oxidation state=4 K2Cr+6O4→Cr+3(OH)4- ; change in oxidation state=3According to oxidation no. method, 3N2H4+4K2CrO4Moles ofK2CrO4  reacted = 24194  moles. 4 moles of K2CrO4  reacts with 3 moles of N2H4 ∴   24194 moles of K2CrO4  reacts with 34 × 24194  moles N2H4 ∴  Amount of N2H4 reacted = 34 × 24194 moles = 34 × 24194 × 32 g =2.969 g
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