{"id":87117,"date":"2025-06-01T04:29:21","date_gmt":"2025-06-01T04:29:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87117"},"modified":"2025-06-01T04:29:21","modified_gmt":"2025-06-01T04:29:21","slug":"which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/","title":{"rendered":"Which one of the following Ni(II) complexes is diamagnetic and has tet"},"content":{"rendered":"

Which one of the following Ni(II) complexes is diamagnetic and has tetrahedral geometry ?<\/p>\n

[amp_mcq option1=”[NiCl\u2084]\u00b2\u207b” option2=”[Ni(CO)\u2084]” option3=”[Ni(NH\u2083)\u2084]\u00b2\u207a” option4=”[Ni(CN)\u2084]\u00b2\u207b” correct=”option2″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC Geoscientist – 2024<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nAmong the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry.
\n<\/section>\n
\n[Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic.
\nFor Ni(II) complexes (d\u2078):
\n– [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons).
\n– [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic.
\n– [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. Forms a square planar complex (dsp\u00b2 hybridization) which is diamagnetic (all electrons paired).
\n<\/section>\n
\nThe question specifically asks for a Ni(II) complex that is diamagnetic and tetrahedral. Based on standard crystal field and valence bond theories, Ni(II) (d\u2078) tetrahedral complexes are typically paramagnetic, while diamagnetic Ni(II) complexes are typically square planar. Therefore, none of the Ni(II) options (A, C, D) are both diamagnetic and tetrahedral. However, option B, [Ni(CO)\u2084], is tetrahedral and diamagnetic, fitting these two criteria perfectly, although it is a Ni(0) complex. This suggests a likely error in the question’s specification of “Ni(II) complexes”, and that option B was the intended answer despite this discrepancy. As per the provided options, B is the only complex listed that possesses both tetrahedral geometry and diamagnetic character.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following Ni(II) complexes is diamagnetic and has tetrahedral geometry ? [amp_mcq option1=”[NiCl\u2084]\u00b2\u207b” option2=”[Ni(CO)\u2084]” option3=”[Ni(NH\u2083)\u2084]\u00b2\u207a” option4=”[Ni(CN)\u2084]\u00b2\u207b” correct=”option2″] This question was previously asked in UPSC Geoscientist – 2024 Download PDFAttempt Online Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation … <\/p>\n

Detailed SolutionWhich one of the following Ni(II) complexes is diamagnetic and has tet<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1091],"tags":[1103,1096,1239],"class_list":["post-87117","post","type-post","status-publish","format-standard","hentry","category-upsc-geoscientist","tag-1103","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nWhich one of the following Ni(II) complexes is diamagnetic and has tet<\/title>\n<meta name=\"description\" content=\"Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic. For Ni(II) complexes (d\u2078): - [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons). - [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic. - [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. Forms a square planar complex (dsp\u00b2 hybridization) which is diamagnetic (all electrons paired).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following Ni(II) complexes is diamagnetic and has tet\" \/>\n<meta property=\"og:description\" content=\"Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic. For Ni(II) complexes (d\u2078): - [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons). - [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic. - [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. Forms a square planar complex (dsp\u00b2 hybridization) which is diamagnetic (all electrons paired).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T04:29:21+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Which one of the following Ni(II) complexes is diamagnetic and has tet","description":"Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic. For Ni(II) complexes (d\u2078): - [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons). - [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic. - [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. Forms a square planar complex (dsp\u00b2 hybridization) which is diamagnetic (all electrons paired).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/","og_locale":"en_US","og_type":"article","og_title":"Which one of the following Ni(II) complexes is diamagnetic and has tet","og_description":"Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic. For Ni(II) complexes (d\u2078): - [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons). - [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic. - [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. Forms a square planar complex (dsp\u00b2 hybridization) which is diamagnetic (all electrons paired).","og_url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T04:29:21+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"1 minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/","url":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-niii-complexes-is-diamagnetic-and-has-tet\/","name":"Which one of the following Ni(II) complexes is diamagnetic and has tet","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T04:29:21+00:00","dateModified":"2025-06-01T04:29:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Among the given options, [Ni(CO)\u2084] is both diamagnetic and has tetrahedral geometry. [Ni(CO)\u2084]: In this complex, Nickel is in the 0 oxidation state (Ni(0)). Its electron configuration is d\u00b9\u2070. All 10 d electrons are paired. The hybridization is sp\u00b3, resulting in a tetrahedral geometry. Since all electrons are paired, the complex is diamagnetic. For Ni(II) complexes (d\u2078): - [NiCl\u2084]\u00b2\u207b: Cl\u207b is a weak field ligand. Forms a tetrahedral complex (sp\u00b3 hybridization) which is paramagnetic (2 unpaired electrons). - [Ni(NH\u2083)\u2084]\u00b2\u207a: NH\u2083 is a moderate field ligand. Can form tetrahedral (sp\u00b3, paramagnetic) or square planar (dsp\u00b2, diamagnetic) complexes depending on conditions, but the tetrahedral form is paramagnetic. - [Ni(CN)\u2084]\u00b2\u207b: CN\u207b is a strong field ligand. 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