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Identify the CORRECT order among the following statements: (A) BeCO3 < BaCO3: covalent character (B) BeO > SrO: lattice energy (C) Be2+ < Li+: hydration energy (D) Be2+(aq) > Li+(aq): ionic mobility

1. BeCO3 < BaCO3: covalent character
2. BeO > SrO: lattice energy
3. Be2+ < Li+: hydration energy
4. Be2+(aq) > Li+(aq): ionic mobility

Correct answer: BeO > SrO: lattice energy

Solution

BeO has the smallest ions, so it has the highest lattice energy (BeO > SrO is correct). Be2+ is smaller and more polarising than Ba2+, so BeCO3 is MORE covalent than BaCO3, making (A) wrong; Be2+ has higher hydration energy than Li+, making (C) wrong; the heavily hydrated Be2+ moves slower than Li+, making (D) wrong.

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