Question

Find total number of compounds having X-O-X type bond: $H_2S_2O_6$; $H_2S_2O_3$; $Cl_2O_7$, $N_2O_5$; $H_4P_2O_7$; $B_3N_3H_6$; $H_2S_2O_7$

• A. $H_2S_2O_6$
• B. $H_2S_2O_3$
• C. $Cl_2O_7$
• D. $N_2O_5$
• E. $H_4P_2O_7$
• F. $B_3N_3H_6$
• G. $H_2S_2O_7$

Answer 1

Answer: (C), (D), (E), (G)

4

Answer 2

The question asks to find the total number of compounds having an X-O-X type bond from the given list. An X-O-X bond is a linkage where an oxygen atom bridges two identical atoms (X).

Let's examine the structure of each compound:

1. $H_2S_2O_6$ (Dithionic acid): This acid contains a direct S-S bond. Its structure is $H O_3 S - S O_3 H$. It does not contain an S-O-S bond.
2. $H_2S_2O_3$ (Thiosulfuric acid): This acid contains an S-S bond. The structure of $S_2O_3^{2-}$ is derived from $SO_4^{2-}$ by replacing one O with S. It has a central S bonded to 3 O atoms and 1 S atom. The structure is $O_3S-S$. The acid is $H_2S_2O_3$. It contains an S-S bond.
3. $Cl_2O_7$ (Dichlorine heptoxide): It has a structure where two $ClO_3$ units are linked by an oxygen atom, Cl-O-Cl. Therefore, it contains a Cl-O-Cl bond.
4. $N_2O_5$ (Dinitrogen pentoxide): It exists as $O_2N-O-NO_2$ in the gaseous state and as $[NO_2]^+[NO_3]^-$ in the solid-state. It contains a N-O-N bond.
5. $H_4P_2O_7$ (Pyrophosphoric acid): It contains a P-O-P bond. Its structure is $(HO)_2P(=O)-O-P(=O)(OH)_2$.
6. $B_3N_3H_6$ (Borazine): It has a cyclic structure with alternating B and N atoms. There are no B-O-B or N-O-N bonds.
7. $H_2S_2O_7$ (Pyrosulfuric acid or Oleum): It contains an S-O-S bond. Its structure is $HO_3S-O-SO_3H$

Therefore, the compounds with X-O-X type bonds are: $Cl_2O_7$, $N_2O_5$, $H_4P_2O_7$, and $H_2S_2O_7$.

Thus, there are a total of 4 compounds.