A first-row transition metal dipositive ion forms an octahedral aqua complex P , which is paramagnetic. The addition of excess ammonia to P gives Q , which also is paramagnetic. Adding excess NaCN to P gives a diamagnetic complex R . The co

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A first-row transition metal dipositive ion forms an octahedral aqua complex P , which is paramagnetic. The addition of excess ammonia to P gives Q , which also is paramagnetic. Adding excess NaCN to P gives a diamagnetic complex R . The complexes P , Q , and R , respectively, are

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Correct answer: A. [ Ni ( H ₂ O )₆ ]²⁺, [ Ni ( NH ₃ )₆ ]²⁺ , and [ Ni ( CN )₄ ]²⁻

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A first-row transition metal dipositive ion forms an octahedral aqua complex P , which is paramagnetic. The addition of excess ammonia to P gives Q , which also is paramagnetic. Adding excess NaCN to P gives a diamagnetic complex R . The complexes P , Q , and R , respectively, are

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