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In [Ni(en)2Cl₂], en is neutral, 2 Cl− balance Ni, making Ni +2. Primary valence is the oxidation state, so 2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Optical Isomerism and Linkage Ionisation Solvate
In [Ni(CN)4]2−, each CN− is −1, totaling −4 for 4 ligands. The overall charge is −2. Thus, x + (−4) = −2, so x = +2.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
en (bidentate) has 2 donor atoms, 2 NH₃ (unidentate) have 2, and 1 H₂O (unidentate) has 1. Total = 2 + 2 + 1 = 5.
Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Isomerism - Geometrical Isomerism in Coordination Compounds
Finely divided nickel (Ni) is used as a catalyst in hydrogenation reactions.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Applications of d and f Block Elements
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