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In the Dewar's method of separation of noble gases, the mixture of noble gases is kept in contact with coconut charcoal at 173 K. Which one of the following gaseous mixtures is not absorbed on to the charcoal?

Ar, Kr
Xe, Kr
He, Ne
Xe, Ar
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In which of the following compounds, nitrogen exhibits highest oxidation state?

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Three reactions involving H2PO
4
are given below

(i) H3PO4 + H2O → H3O+ + H2PO
4

(ii) H2PO
4
+ H2O → HPO2–
4
+ H3O+

(iii) H2PO
4
+ OH → H3PO4 + O2–

In which of the above does H2PO
4
act as an acid?

Answer
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