Which of the following thermal stability orde | vedclass

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(D) The thermal stability $(T.S.)$ of oxo-salts (like carbonates,nitrates,and chlorates) of alkali and alkaline earth metals increases as the size of

Vedclass · Accepted Answer

All are correct

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(D) The thermal stability $(T.S.)$ of oxo-salts (like carbonates,nitrates,and chlorates) of alkali and alkaline earth metals increases as the size of the cation increases.This is because the polarizing power of the cation decreases as its size increases,which leads to greater stability of the lattice.Mathematically,$T.S. \propto 	ext{Size of cation} \propto \frac{1}{	ext{Polarizing power}}$.In option $A$,the stability of alkali metal nitrates increases from $Li$ to $Cs$.In option $B$,the stability of alkali metal chlorates increases from $Li$ to $Cs$.In option $C$,the stability of alkaline earth metal carbonates increases from $Be$ to $Ba$.Therefore,all the given orders are correct.

List-$I$ (Elements)	List-$II$ (Properties)
$(a)$ $Ba$	$(i)$ Organic solvent soluble compounds
$(b)$ $Ca$	$(ii)$ Outer electronic configuration $6s^2$
$(c)$ $Li$	$(iii)$ Oxalate insoluble in water
$(d)$ $Na$	$(iv)$ Formation of very strong monoacidic base

Which of the following thermal stability orders is correct?

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Which of the following order$(s)$ is/are correct?
$(A)$ Thermal stability: $BeSO_4 < MgSO_4 < CaSO_4 < SrSO_4$
$(B)$ Melting point: $NaCl > KCl > RbCl > CsCl$
$(C)$ Solubility: $LiOH < NaOH$
$(D)$ Lattice energy: $KF > KCl > KBr > KI$

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