Which of the following statements is text{Inc | vedclass

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(D) $1$. $Mg$ is the central metal ion in the chlorophyll molecule,which is correct.$2$. Alkaline earth metals (Group $2$) form oxides $(MO)$ and pero

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Permanent hardness of water is removed by boiling

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(D) $1$. $Mg$ is the central metal ion in the chlorophyll molecule,which is correct.$2$. Alkaline earth metals (Group $2$) form oxides $(MO)$ and peroxides $(MO_2)$ with oxygen,but they do not form superoxides $(MO_2)$ like alkali metals,which is correct.$3$. $NaHCO_3$ (Sodium bicarbonate) is commonly known as baking soda,which is correct.$4$. Permanent hardness of water is caused by the presence of dissolved chlorides and sulfates of calcium and magnesium. Boiling only removes temporary hardness (caused by bicarbonates). Therefore,this statement is $	ext{Incorrect}$.

Which of the following statements is $\text{Incorrect}$:

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