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61. answer is (2) nylon 2-nylon 6
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61,
m not sure of it
67,option 3
- for reactants we use negative sign
- we write in fraction for the no of moles of element ,ex from above q N2 is given,so we take -1/1
- for product ,d/dt will be positive
- Because with the change in time,concentration of reactant decreases whereas products increase
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