MCQ
Incorrect statement when $C_2$ change to $C_2^{-2}$
- AMagnetic properties remain same
- BBond order increases
- C$\sigma $ bond decreases
- ✓$\pi $ bond increases
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$(A)$Covalent radius decreases down the group from $\mathrm{C}$ to $\mathrm{Pb}$ in a regular manner.
$(B)$ Electronegativity decreases from $\mathrm{C}$ to $\mathrm{Pb}$ down the group gradually.
$(C)$ Maximum covalence of $\mathrm{C}$ is $4$ whereas other elements can expand their covalence due to presence of $d$ orbitals.
$(D)$ Heavier elements do not form $\mathrm{p} \pi-p \pi$ bonds.
$(E)$ Carbon can exhibit negative oxidation states.
Choose the correct answer from the options given below:
Reason : $Si -O -Si$ linkages are moisture sensitive.