Which one of the following equations does not correctly represent the first law of thermodynamics for the given processes involving an ideal gas? (Assume non-expansion work is zero)

Which of the following amines can be prepared by Gabriel phthalimide reaction ?

In the following compounds, the decreasing order of basic strength will be :

The correct order of the spin-only magnetic moment of metal ions in the following low-spin complexes, [V(CN)₆]^4–,[Fe(CN)₆]^4–, [Ru(NH₃)₆]³⁺, and [Cr(NH₃)₆]²⁺ , is :