MCQ
How many resonance forms can be written for the nitrate ion, $(NO^-_3)$ ?
- A$1$
- B$2$
- C$3$
- D$4$

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$\mathrm{H}_2(\mathrm{~g})+\mathrm{I}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{HI}(\mathrm{g})$, the $\mathrm{K}_{\mathrm{p}}$ for the process is $\mathrm{x} \times 10^{-1} \cdot \mathrm{x}=$ $\qquad$
[Given : $\mathrm{R}=0.082 \mathrm{~L} \mathrm{~atm} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$ ]
The correct order of their acidity is 
| List$I$ | List$II$ |
| $A.$ Cobalt catalyst | $I.$ $\left( H _2+ Cl _2\right)$ production |
| $B.$ Syngas | $II.$ Water gas production |
| $C.$ Nickel catalyst | $III.$ Coal gasification |
| $D.$ Brine solution | $IV.$ Methanol production |
Choose the correct answer from the options given below :-