Which of the following is not correct?

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(D) . $LiOH$ is a weaker base than $NaOH$ because $Li^+$ has a higher charge density than $Na^+$,which increases the covalent character of the $Li-OH$

Vedclass · Accepted Answer

Hydrolysis of beryllium carbide gives acetylene

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(D) . $LiOH$ is a weaker base than $NaOH$ because $Li^+$ has a higher charge density than $Na^+$,which increases the covalent character of the $Li-OH$ bond,making it less ionic and thus a weaker base. This statement is correct.$B$. Salts of $Be$ undergo hydrolysis due to the high charge density and small size of $Be^{2+}$ ion,which polarizes the water molecules. This statement is correct.$C$. $Ca(HCO_3)_2$ is soluble in water. This statement is correct.$D$. Hydrolysis of beryllium carbide $(Be_2C)$ gives methane $(CH_4)$,not acetylene $(C_2H_2)$. The reaction is: $Be_2C + 4H_2O \rightarrow CH_4 + 2Be(OH)_2$. Therefore,this statement is incorrect.

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