At the triple point of a pure substance, the number of

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At the triple point of a pure substance, the number of degrees of freedom is

1. 0
2. 1
3. 2
4. 3

Correct Option: A

According to Gibb's phase rule
P + F = C + 2
at triple point C = 1, P = 3
3 + F= 1 + 2
F = 0