MCQ
Select the correct statement about the given complex


- AIt has four ions in aqueous solution
- BPrimary valency of cobalt is six.
- ✓It give one mole of $AgCl$ ppt on reaction with excess of $AgNO_3$.
- DIt has one primary valency

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$(A)$ A secondary alcohol on oxidation gives a ketone
$(B)$ Ethanol reacts with conc. ${H_2}S{O_4}$ at ${180\,^o}C$ to yield ethylene
$(C)$ Methanol reacts with iodine and sodium hydroxide to give a yellow precipitate of iodoform
$(D)$ Hydrogen gas is liberated when sodium is added to alcohol. Select the correct statements from the above set: