MCQ
What tool was Thomson using when he discovered the electron?
- AMagnifying Glass
- BHammer
- ✓Cathode Ray
- DMicroscope
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Statement $(I)$ : Kjeldahl method is applicable to estimate nitrogen in pyridine.
Statement $(II)$ : The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method.
In the light of the above statements, choose the correct answer from the options given below.
| Acid | $K_a$ |
| $HCN$ | $6.2\times 10^{-10}$ |
| $HF$ | $7.2\times 10^{-4}$ |
| $HNO_2$ | $4.0\times 10^{-4}$ |
Correct order of increasing base strength of the base $CN^-,F^-$ and $NO_2^-$ will be