Identify the correct statements from the foll | vedclass

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(B) $(i)$ Quartz is a crystalline form of $SiO_2$ and exhibits piezoelectric properties, making it useful in electronic devices. This statement is cor

Vedclass · Accepted Answer

$i, ii$

Vedclass · Answer

(B) $(i)$ Quartz is a crystalline form of $SiO_2$ and exhibits piezoelectric properties, making it useful in electronic devices. This statement is correct.$(ii)$ Group $14$ elements (except $C$) have vacant $d$-orbitals, allowing them to accept lone pairs from water molecules, leading to hydrolysis. $CCl_4$ cannot be hydrolyzed due to the absence of $d$-orbitals. This statement is correct.$(iii)$ In graphite, the $C-C$ bond distance within the layers is $141.5 \ pm$, not $154 \ pm$ (which is the $C-C$ bond length in diamond). This statement is incorrect.$(iv)$ $SiO_2$ is acidic in nature and is insoluble in $HCl$, but it reacts with $HF$ to form $SiF_4$. This statement is incorrect.Therefore, statements $(i)$ and $(ii)$ are correct.

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