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For the reaction , N2H4+H2rightarrow2NH3...

For the reaction , `N_2H_4+H_2rightarrow2NH_3`, bond energies are given as : `B.E(N-N)=x`,`B.E(H-H)=y` ,`BE(N-H)=z`, then `DeltaH_f°(NH_3)` is

A

`x-2z-y`

B

`x/2 - (y/2)- z`

C

`z - (x/2) + (y/2)|`

D

cannot be calculated

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AAKASH INSTITUTE ENGLISH-TEST 5-EXAMPLE
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  2. Which of the following is an acidic buffer?

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  3. For the reaction , N2H4+H2rightarrow2NH3, bond energies are given as :...

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  4. pH of 0.05 aqueous solution of weak acid HA(Ka=4×10^(-4)) is

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  5. Equal moles of N2 ,H2 and NH3 are present in a container which are eff...

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  6. Which of the following set has DeltafH°=0?

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  7. If degree of dissociation is 0.5 at equilibrium then the equilibrium c...

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  8. Coordination compounds used as catalysts in the hydrogenation of alken...

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  9. In which case John teller effect is maximum

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  10. Which is only sigma bonded organometallic complex?

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  11. If delta0 of Ni^(2+) in presence of NH3 is 100 KJ then that for Pd^(2+...

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  12. Which of the following is correct for same metal and ligand?

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  14. Electronic configuration od d^8 system in low spin octahedral complex

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  15. Which of the following is paramagnetic?

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  16. Which of the following will not show optical isomerism?

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