Mention the hybridization and the geometry attained in the central metal and complex ions - [ Ni ( Cl 4 ) ] 2 -

This complex is tetrachloronickelate (II). In this complex, there are 4 chlorine atoms with a charge of -1 and hence, the oxidation state of Ni is +2. The geometry of the complex is tetrahedral, and it is known to be paramagnetic due to the presence of two unpaired electrons. This is explained by the concept of sp 3 hybridization.

Mention the hybridisation and the geometry attained in the central metal and complex ions. [ Fe ( CN ) 6 ] 3 -

This complex is hexacyanoferrate (III) in which the coordination number of Fe ( III ) is six. The geometry of the complex is octahedral, and it is known to be weakly paramagnetic. This is explained by the concept of d 2 sp 3 hybridization. It is an inner orbital complex.

Write the IUPAC name of the following coordination compound : [ Ag ( NH 3 ) 2 ] [ Ag ( CN ) 2 ]

In the given coordination compound, both anionic and cationic complexes are present. The ligand present in the anionic complex is ( CN ) and is named dicyano because of the presence of 2 ( CN ) molecules. The ligand present in the cationic complex is a neutral ligand, ( NH 3 ) and it is named diammine because of the presence of 2 ( NH 3 ) molecules. While writing the name of the anionic complex, the metal atom Ag is named as 'argenate' and while writing the name of the cationic complex, the metal atom is named as 'silver'. The oxidation state of silver in the cationic complex is +1 and the oxidation state of silver in anionic complex is also + 1 . Therefore, the IUPAC name of the compound is diamminesilver (I) dicyanoargentate (I).

Write the IUPAC name of the following coordination compound : K 2 [ Zn ( OH ) 4 ]

In the given coordination compound, potassium includes the cationic part of the compound. The ligand present in the compound is ( OH ) and is named 'tetrahydroxo' because of the presence of four ( OH ) molecules. The central metal atom present is zinc and is named as 'zincate' as it is present in the anionic part. The oxidation state of zinc in the compound is calculated by considering its value as 'x'. 2 1 + x + 4 - 1 = 0 x = + 2 Therefore, the IUPAC name of the compound is potassium tetrahydroxozincate (II).

Write the chemical formula of the following coordinate compound : Potassium tetraiodomercurate (II)

Potassium tetraiodomercurate(II). Here, we have potassium outer cation and a complex anion. The formula of the ligands present in the complex are, Iodo - I - Let us create the formula of the anion complex first, keeping in mind that the central atom is written first and then, ligands are listed in alphabetical order. HgI 4 2 - Let the number of outer cation be x. Taking into account the charges on various species we have, x + 2 - 4 = 0 x = + 2 Therefore, the chemical formula of the complex compound is K 2 [ HgI 4 ] .

What are chelates? Give one example.

A bidentate or polydentate ligand linking to central metal ion through two or more donor atoms forming a ring structure is called a chelating ligand and the complex is called a chelate. Ethylene diamine coordinates through both the nitrogen atoms to central Cu 2 + ion forming a ring structure.

Write the name of organometallic compounds used as an anti-knock.

Tetraethyl lead is an organometallic used as an antiknock. The abnormal combustion of fuel in engines produces a specific type of sound, called as knocking. Antiknock agents are gasoline additives that helps in reducing the knocking of the engine. Tetraethyl lead is a lead based compound and used as central antiknock specialist for car fuel or petroleum.

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Write chemical formula for the following coordinate compounds :

Hexaaquachromium (III) chloride

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