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The mechanism of the reaction 2NO(g)+...

The mechanism of the reaction
`2NO(g)+H_(2)(g)rarrN_(2)(g)+2H_(2)O(g)`, is:
Step1: `2NO(g)+H_(2)(g)overset(("slow"))rarrN_(2)+H_(2)O_(2)`
Step2: `H_(2)O_(2)+H_(2)overset("fast")rarr2H_(2)O`

A

rate=`k[NO]^(2)[H_(2)]^(2)`

B

rate =`k[H_(2)O_(2)][H_(2)]`

C

on doubling the concentration of `H_(2)` keeping the concentration of NO constant, the rate will become double

D

if the intial concentration of `H_(2) and NO "is" C_(0)` and after time 't' the concentration of `N_(2)` is x, then
`:.` Rate `k=(C_(0)-2x)^(x)`

Text Solution

Verified by Experts

The correct Answer is:
C
slowest step is rate detemining
`:.` Rate =`k[NO]^(2)[H_(2)`
`:.` On doubling the concentration of `H_(2)` without changing he concentration of No, the rate will become first order double.
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For the reaction mechanism of the reaction {:(2NO(g),+,2H_(2)(g)),(to N_(2)(g),+,2H_(2)O(g)):} {:("Step I",2NO,overset(k_(1))hArr,N_(2)O_(2),,,K_(eq)"(fast)"),("Step II",N_(2)O_(2)+H_(2),overset(k_(2))rarr,N_(2)O+H_(2)O,,"(slow)"),("Step III",N_(2)O+H_(2),overset(k_(3))rarrr,N_(2)+H_(2)O,,"(fast)"):} Expression of rate of reaction is (Take K_(eq) xx k_(2) = k')

In the reaction 2H_(2)(g) + O_(2)(g) rarr 2H_(2)O (l), " "Delta H = - xkJ

Determining the rate law from a mechanism with an initial slow step: Ozone reacts with nitrogen dioxide to produce oxygen and dinitrogen pentoxide O_(3)(g)+2NO_(2)(g)rarrO_(2)(g)+N_(2)O_(5)(g) The proposed mechanism is O_(3)(g)+NO_(2)(g)overset(slow)rarr NO_(3)(g)+O_(2)(g) NO_(3)(g)+NO_(2)(g)overset("fast")rarrN_(2)O_(5)(g) What is the rate law predicted by this mechanism ? Strategy : The designations "slow" and "fast" indicate the relative rates of the steps. The rate is determined completely by the slow step, or rate-determining sterp.

The reaction 2H_2O(l)rarr2H_2(g)+O_2(g) is an example of

2H_(2)+O_(2)to2H_(2)O 2 g H_(2) and 1 g O_(2) react to form H_(2)O

For the reaction 2H_(2) + 2NO rarr N_(2) + 2H_(2)O , the following mechanism has been suggested : 2NO ? N_(2)O_(2) equilibrium constant K_(1) (fast) N_(2)O_(2) +H_(2) overset(k_(2)) rarr N_(2)O +H_(2)O (slow) N_(2) O +H_(2) overset(k_(3)) rarr N_(2)+H_(2)O (fast) Establish the rate law for given reaction.

OP TANDON-CHEMICAL KINETICS-OBJECTIVE QUESTIONS (LEVEL-B) SET I
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  2. The rate constant of the reaction 2H(2)O(2)(aq) rarr 2H(2)O(l) + O(2...

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  3. The mechanism of the reaction 2NO(g)+H(2)(g)rarrN(2)(g)+2H(2)O(g), ...

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  5. The reaction Aoverset(k)rarr Product, is zero order while the reaction...

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  6. Which of the following is pseudo-unimolecular reaction ?

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  8. A reactant (A) forms two products A overset (k(1))rarr B, Activation...

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  9. Collision theory is satisfactory for:

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  10. Initial concentration of reactant for nth order reaction is 'a'. Which...

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  11. Half life of a reaction becomes half when intial concentrations of rea...

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  12. Arrehnius equation is : k=Ae^(-E(a)//RT) Which of the following gr...

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  13. If a homogeneous catalytic reaction can take place through three alter...

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  14. The rate constant for the reaction: 2N(2)O(5) rarr 4NO(2)+O(2) is 3....

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  16. Two different first order reactions have rate consants k(1) and k(2) "...

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  17. In the reaction A+BrarrC+D, the rate ((dx)/(dt)) when plotted against ...

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  18. In the hober's process of ammonia manufacture, N(2)(g)+3H(2)(g) rarr...

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  19. A reaction ArarrB , involes following mechanism : Step1 : Aoverset(...

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