MCQ
Incorrect order is
- ABasic strength : $MgO < NiO < K_2O < Cs_2O$
- BThermal stability : $NH_3 < PH_3 < AsH_3$
- CSolubility : $Li_2 CO_3 < Na_2CO_3 < K_2CO_3$
- ✓$(A)$ and $(B)$ both
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$(I)\,\,HCHO$ $ (II)\,\,CH_3CHO$
$(III)$ Acetone $\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,||} \\
{(IV)\,\,\,Et - C - Et}
\end{array}$
$(A)$ $\alpha$ -sulphur
$(B)$ $\beta$ -sulphur
$(C)$ $S _{2}$ -form

According the Werner's theory.
$(1)$ Ligands are connected to the metal ions by covalent bonds.
$(2)$ Secondary valencies have directional properties
$(3)$ Secondary valencies are non-ionisable
Of these statements :