Chemical Process
In nylon-66, the first and second numbers (i.e., 6) respectively designate the number of carbon atoms present in the

Diamine and the dibasic acid
Diamine and the ring
None of these
Dibasic acid and the ring

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Chemical Process
In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

Gives higher conversion efficiency
All of these
Has a longer life and is not poisoned by arsenic
Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant

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