According to Fajan covalency is favoured by :
(i) Small size of cation
(ii) Large size of anion
(iii) High charge on cation, anion or both
(iv) Cation with non-noble gas configuration
Column-1 | Column-2 | Column-3 | |||
(I) | NaF, NaCl, NaBr, NaI | (i) | Size of cation increases | (P) | Covalent character increases |
(II) | NaCl, MgCl2, AlCl3 | (ii) | Size of anion increases | (Q) | Ionic character increases |
(III) | MgCO3, CaCO3, SrCO3, BaCO3 | (iii) | Charge on anion increases | (R) | Melting point increases |
(IV) | LiOH, NaOH, KOH, RbOH | (iv) | Charge density decreases (Magnitude) | (S) | Solubility increases |
(i) Which of the following combination is incorrect ?
Text Solution
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(i)c (ii)d (iii)d
Sol. (i to iii)
NaF, NaCl, NaBr, NaI
Size of anion increases
Polarisation of anion increases
Covalent character increases
Melting point decreases
NaCl, MgCl 2 , AlCl 3
Size of cation decreases
Charge on cation increases
Charge density of cation increases
Polarising power increases
Covalent character increases
MgCO 3 , CaCO 3 , SrCO 3 , BaCO 3
Size of cation increases
Charge density on cation decreases
Ionic character increases
Solubility decreases
LiOH, NaOH, KOH, RbOH
Size of cation increases
Charge density decreases
Ionic character increases
Solubility increases
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