Which of the following contain dative bond

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H₃O⁺

NH₄⁺

K₄[Fe(CN)₆]

CuSO₄.5H₂O

answer is A, B, C, D.

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Detailed Solution

solution

$H_{3} O^{+}$ ion contains two O-H covalent bonds.
One O-H co-ordinate bond.
Hence, $H_{3} O^{+}$ ion has two covalent and one covalent coordinate bond.
The bonds present in K₄[Fe(CN)₆] are ionic, covalent and coordinate covalent bonds. Ionic bonds are present between K⁺ ion and [Fe(CN)₆]⁴⁻ ion.
Covalent bonds are present in C≡N ligand.
Co-ordinate covalent bonds are present between Fe and C and also in between C and N.
In ${NH}_{4}^{+}$ molecule, there is 2 types of bonds are present: three covalent bonds and one coordinate bond. In this compound, nitrogen has one lone pair of electron and one hydrogen atom has vacant orbital and that's the condition of the formation of a coordination bond.

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