The decreasing order of reactivity of the following organic molecules towards AgNO₃ solution is :

For one mole of an ideal gas, which of these statements must be true?
(a) U and H each depends only on temperature
(b) Compressibility factor z is not equal to 1
(c) C_{P, m} – C_{V, m} = R
(d) dU = C_VdT for any process

The elements with atomic numbers 101 and 104 belong to, respectively :

The pair in which both the species have the same magnetic moment (spin only) is :