D-And F-Block Elements Ques 481

Question: Which of the following statements is false-

Options:

A) $ Na_2Cr_2O_7 $ is less soluble than $ K_2Cr_2O_7 $ .

B) $ Na_2Cr_2O_7 $ is primary standard in volumetry.

C) $ CrO{{_4^{2-}}^{~}} $ is tetrahedral in shape.

D) $ Cr_2O_7^{2-} $ has a $ Cr-O-Cr $ bond.

Show Answer

Answer:

Correct Answer: A

Solution:

bond in $ Cr_2O_7^{2-} $ $ Na_2Cr_2O_7 $ is used an primary standard in volumetry. Hydration energy of $ N{{a}^{+}} $ is greater than $ {{K}^{+}} $ because of smaller size of $ N{{a}^{+}},Na_2Cr_2O_7 $ is more soluble than $ K_2Cr_2O_7. $



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