Which of the following is an incorrect match?

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(D) $1$. Permutit is a synthetic zeolite,which is a hydrated sodium aluminum silicate $(Na_2Al_2Si_2O_8 \cdot xH_2O)$. This is a correct match.$2$. Ca

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Hydrolith $	o$ Electron deficient hydride

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(D) $1$. Permutit is a synthetic zeolite,which is a hydrated sodium aluminum silicate $(Na_2Al_2Si_2O_8 \cdot xH_2O)$. This is a correct match.$2$. Calgon is sodium hexametaphosphate,$(NaPO_3)_6$. This is a correct match.$3$. $BeH_2$ and $MgH_2$ are covalent polymeric hydrides due to their small size and high polarizing power. This is a correct match.$4$. Hydrolith is calcium hydride $(CaH_2)$. It is an ionic (saline) hydride,not an electron-deficient hydride. Electron-deficient hydrides are typically formed by group $13$ elements like $BH_3$. Therefore,this is the incorrect match.

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