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Given are the nickel compounds NiCO4, K2NiF6 and K2Ni(CN)4 The order of compounds having increasing oxidation number of nickel is

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a
Ni(CO)4<K2NiF6<K2Ni(CN)4
b
Ni(CO)4<K2Ni(CN)4<K2NiF6
c
K2Ni(CN)6<K2NiF6<Ni(CO)4
d
K2Ni(CN)6<Ni(CO)4<K2NiF6

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detailed solution

Correct option is B

The oxidation number of nickel in Ni(CO)4, K2Ni(CN)4 and K2NiF6 are 0, +2 and +4, respectively.

The total number of electrons that an atom acquires or loses in the process of joining with another atom to create a chemical bond is known as the oxidation number, also known as the oxidation state.

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