The $INCORRECT$ statement regarding the structure of $C_{60}$ is :
- AThe six-membered rings are fused to both six and five-membered rings.
- BEach carbon atom forms three sigma bonds.
- CThe five-membered rings are fused only to six-membered rings.
- DIt contains $12$ six-membered rings and $24$ five-membered rings.
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Among the following elements,$X$ exhibits maximum catenation and $Y$ is the least abundant on earth. $X$ and $Y$ elements are
Assertion $(A)$: The maximum covalency of $Si$ and $Ge$ is $6$ but that of carbon is $4$.
Reason $(R)$: Due to the presence of $d$-orbitals in $Si$ and $Ge$,both these elements can undergo $sp^3d^2$ hybridisation and covalency of $6$ is possible. Carbon has no $d$-orbitals in it and hence its covalency is $4$.
The correct answer is:
Reason $(R)$: Due to the presence of $d$-orbitals in $Si$ and $Ge$,both these elements can undergo $sp^3d^2$ hybridisation and covalency of $6$ is possible. Carbon has no $d$-orbitals in it and hence its covalency is $4$.
The correct answer is:
$C_{60}$ contains which of the following?
Easy
View SolutionWhat is the value of $\angle S-S-S$ in the puckered $S_8$ ring of rhombic sulfur (in $^{\circ}$)?
Which one of the following oxides is expected to exhibit paramagnetic behaviour?
MediumAIPMT 2005
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