Which of the following species is not a pseudohalide?
- A$CNO^{-}$
- B$RCOO^{-}$
- C$OCN^{-}$
- D$N_3^-$
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Match the following molecules in Column-$I$ with the number of lone pairs on their central atom in Column-$II$.
Column-$I$ (Molecules) Column-$II$ (Number of lone pairs on central atom) $A$. $NH_3$ $1$. Two $B$. $H_2O$ $2$. Three $C$. $XeF_2$ $3$. Zero $D$. $CH_4$ $4$. Four $5$. One
| Column-$I$ (Molecules) | Column-$II$ (Number of lone pairs on central atom) |
|---|---|
| $A$. $NH_3$ | $1$. Two |
| $B$. $H_2O$ | $2$. Three |
| $C$. $XeF_2$ | $3$. Zero |
| $D$. $CH_4$ | $4$. Four |
| $5$. One |
An open pipe of length $33 \ cm$ resonates to a frequency of $1000 \ Hz$. The mode of vibration is: (velocity of sound $= 330 \ m/s$)
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