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Question:

Which of the following statements is false?

Na2Cr2O7is less soluble thanK2Cr2O7

Cr2O2𕒻has aCr−O−Crbond

CrO2ð•’¸is tetrahedral in shape

Na2Cr2O7is a primary standard in volumetry

Solution:

(A) Na2Cr2O7 is more soluble than K2Cr2O7. The solubility of Na2Cr2O7 is higher than that of K2Cr2O7. This is due to the difference in the hydration energies of the cations. Sodium ions (Na+) have a higher hydration energy than potassium ions (K+). The higher hydration energy of Na+ helps to overcome the lattice energy of Na2Cr2O7, making it more soluble in water compared to K2Cr2O7.