MCQ
Arrange the following in decreasing acidic strength.


- ✓$A > B > C > D$
- B$B > A > C > D$
- C$D > C > A > B$
- D$D > C > B > A$


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$(A)$ Ethane-$1\ 2$-diamine is a chelating ligand.
$(B)$ Metallic aluminium is produced by elecrtrolysis of aluminium oxide in presence of cryolite.
$(C)$ Cyanide ion is used as ligand for leaching of silver.
$(D)$ Phosphine act as a ligand in Wilkinson catalyst.
$(E)$ The stability constants of $\mathrm{Ca}^{2+}$ and $\mathrm{Mg}^{2+}$ are similar with $EDTA$ complexes.
Choose the correct answer from the options given below:

Compound $(D)$ is sodium hexametaphosphate which is known as
$A$ $\&$ $B$ are :
