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(A) $1$. $VH$ is a metallic (interstitial) hydride,so $1-b$.$2$. $HF$ is a molecular (covalent) hydride,so $2-d$.$3$. $MgH_2$ is an ionic (saline) hyd

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$1-b, 2-d, 3-a, 4-c$

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(A) $1$. $VH$ is a metallic (interstitial) hydride,so $1-b$.$2$. $HF$ is a molecular (covalent) hydride,so $2-d$.$3$. $MgH_2$ is an ionic (saline) hydride,so $3-a$.$4$. $B_2H_6$ is an electron-deficient (molecular) hydride,but in the context of classification types provided,it is often categorized as electron-deficient or electron-precise depending on the specific textbook context; however,based on standard classification,$B_2H_6$ is electron-deficient. Given the options,$4-c$ is the intended match for electron-precise/deficient classification.Therefore,the correct match is $1-b, 2-d, 3-a, 4-c$.

Column $-A$	Column $-B$
$(1)$. $VH$	$(a)$. Ionic hydride
$(2)$. $HF$	$(b)$. Metallic hydride
$(3)$. $MgH_2$	$(c)$. Electron precise hydride
$(4)$. $B_2H_6$	$(d)$. Molecular hydride

Match the correct option from Column $-A$ and Column $-B$.

Column $-A$ Column $-B$

$(1)$. $VH$ $(a)$. Ionic hydride

$(2)$. $HF$ $(b)$. Metallic hydride

$(3)$. $MgH_2$ $(c)$. Electron precise hydride

$(4)$. $B_2H_6$ $(d)$. Molecular hydride

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Match the correct option from Column $-A$ and Column $-B$. Column $-A$ Column $-B$ $(1)$. $VH$ $(a)$. Ionic hydride $(2)$. $HF$ $(b)$. Metallic hydride $(3)$. $MgH_2$ $(c)$. Electron precise hydride $(4)$. $B_2H_6$ $(d)$. Molecular hydride