Which of the following is the incorrect order | vedclass

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(B) $1$. Basic strength: Metallic character increases down the group and across the period from right to left. $Cs_2O$ is the most basic,followed by $

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Thermal stability: $NH_3 < PH_3 < AsH_3$

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(B) $1$. Basic strength: Metallic character increases down the group and across the period from right to left. $Cs_2O$ is the most basic,followed by $K_2O$,$NiO$,and $MgO$. Thus,$MgO $2$. Thermal stability: For hydrides of group $15$ elements,thermal stability decreases down the group as the bond dissociation energy decreases due to an increase in bond length $(NH_3 > PH_3 > AsH_3 > SbH_3 > BiH_3)$. The given order $NH_3 $3$. Solubility: Solubility of alkali metal carbonates increases down the group due to the decrease in lattice energy being more significant than the decrease in hydration energy. Thus,$Li_2CO_3 $4$. Since $(B)$ is the only incorrect order,the correct answer is $(B)$.

Which of the following is the incorrect order?

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