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Which of the following orderings is NOT in exact agreement with the property stated alongside it?

1. HF < HCl < HBr < HI: increasing acid strength
2. NH₃ < PH₃ < AsH₃ < SbH₃: increasing basic strength
3. B < C < O < N: increasing first ionization enthalpy
4. CO₂ < SiO₂ < SnO₂ < PbO₂: increasing oxidising power

Correct answer: NH₃ < PH₃ < AsH₃ < SbH₃: increasing basic strength

Solution

The basic strength of these hydrides decreases down the group due to the increasing size and decreasing electronegativity of the central atom, making NH₃ a stronger base than PH₃, AsH₃, and SbH₃, which contradicts the stated order.

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