Is Cr(NH3)6(NO3)3 is an element or compound?

Is Cr(NH3)6(NO3)3 is an element or compound?
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Compound????
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The oxidation state of Cr in `[Cr(H_(2)O)_(6)]Cl_(3), [Cr(C_(6)H_(6))_(2)], and K_(2)[Cr(CN)_(2)(O)_(2)(O_(2))(NH_(3))]` respectively are :

Description : The oxidation state of Cr in `[Cr(H_(2)O)_(6)]Cl_(3), [Cr(C_(6)H_(6))_(2)], and K_(2)[Cr(CN)_(2)(O)_(2)(O_(2))(NH_(3))]` respectively are :

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Which of the following facts about the complex `[Cr(NH_(3))_(6)]Cl_(3)` is wrong ?

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The spin only magnetic moment value ( in Bohr magneton units ) of `Cr(CO)_(6)` is :

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Total number of paramagnetic complexes which are inner orbital complexes : `(i) [Cr(NH_(3))_(6)]Cl_(3) " " (ii)[Co(NH_(3))_(6)](NO_(3))_(2)" " (iii)[N

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Calculate the EAN of central atom in the following complexes `(a) [Cr(CO)_(6)]" "(b) [Fe(CN)_(6)]^(4-)" " (c ) [Fe(CO)_(5)] " " (d) [Co(NH_(3))_(6)]^(

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Last Answer : In [Co(NH3)6]3+, the d-electrons of Co3+ ([Ar]3d6 45°) get paired leaving behind two empty d-orbital and undergo d2sp3 hybridization and hence inner orbital complex, while in [Ni(NH3)6]2+ ... of Ni2+([Ar]3d8 45°) do not pair up and use outer 4d subshell hence outer orbital complex.

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Last Answer : (i) [CO(NH3)6]3+ : Orbitals of CO3+ ion : Hybridization : d2sp3 Shape : Octahedral Magnetic behaviour : Diamagnetic (absence of unpaired electrons) (ii) [Ni(CN)4]2-

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