How many of the following are correct orders of property indicated against it ? (i) I − Br − Cl − F − (order of polarizability) (ii) Li + Na + K + Cs + (order of polarising power) (iii) Li

Question

How many of the following are correct orders of property indicated against it ?

(i) $I^{-} > Br^{-} > Cl^{-} > F^{-}$ (order of polarizability)

(ii) $Li^{+} > Na^{+} > K^{+} > Cs^{+}$ (order of polarising power)

(iii) $Li^{+} > Mg^{2 +} > Al^{3 +}$ (order of polarising power)

(iv) $LiI > NaI > KI$ (order of ionic character)

(v) $Be (NO_{3})_{2} > Mg (NO_{3})_{2} > Ca (NO_{3})_{2} > Sr (NO_{3})_{2} > Ba (NO_{3})_{2}$ (order of solubility in water)

(vi) $LiOH > NaOH > KOH > RbOH > CsOH$ (thermal stability)

TestHub · Accepted Answer

I⁻ > Br⁻ > Cl⁻ > F⁻ (Polarizability)

Larger ions are more easily polarizable → Correct

Li⁺ > Na⁺ > K⁺ > Cs⁺ (Polarizing power)

Smaller cations with higher charge density polarize anions more → Correct

Li⁺ > Mg²⁺ > Al³⁺ (Polarizing power)

Polarizing power depends on charge/radius ratio; Al³⁺ > Mg²⁺ > Li⁺ → Incorrect

LiI > NaI > KI (Ionic character)

Ionic character decreases with increasing cation size → Incorrect

Be(NO₃)₂ > Mg(NO₃)₂ > Ca(NO₃)₂ > Sr(NO₃)₂ > Ba(NO₃)₂ (Solubility)

Smaller cations form more soluble nitrates → Correct

LiOH > NaOH > KOH > RbOH > CsOH (Thermal stability)

Thermal stability of alkali metal hydroxides increases down the group → Incorrect

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