Question

STATEMENT-1:
In $C{O}_2$ molecule, resonance is possible
STATEMENT-2:
CO is used in purification of Ni
STATEMENT-3:
$H_{2}C{O}_3$ is more acidic than $H_{2}Si{O}_3$

• A. TTT
• B. TFT
• C. TTF
• D. FTF

Answer 1

The correct option is A TTT

$C{O}_2$ has three resonating structures out of which the charged structures have the minor contribution to the main structure.

CO used in the purification and extraction of Ni, the process is known as Mond's process or carbonyl process.
The reaction of purification of Ni is
$Ni+4CO\to Ni\left(CO\right)4\to \underset{Purenickel}{Ni}+4CO$

Strength of acid can be compared directly by checking the stability of conjugate base. When we compare the conjugate bases i.e. $C{O}_3^{2-}$ and $Si{O}_3^{2-}$, we see scope for resonance/ḍelocalisation of charge. Charge can be better delocalised in the case of $C$ atom as opposed to $Si$. Hence, $C{O}_3^{2-}$ is the stronger conjugate base. This means that $H_{2}C{O}_3$ is the stronger acid.