{"id":87998,"date":"2025-06-01T06:59:21","date_gmt":"2025-06-01T06:59:21","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87998"},"modified":"2025-06-01T06:59:21","modified_gmt":"2025-06-01T06:59:21","slug":"copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/","title":{"rendered":"Copper sulphate crystals available in the market are blue coloured cry"},"content":{"rendered":"

Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour ?<\/p>\n

[amp_mcq option1=”Oxygen” option2=”Nitrogen” option3=”Water” option4=”Hydrogen” correct=”option3″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-1 – 2023<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nCopper sulphate crystals available in the market are typically copper(II) sulphate pentahydrate (CuSO\u2084\u00b75H\u2082O). The blue colour is due to the presence of water molecules coordinated to the copper ions in the crystal lattice. When heated, these crystals lose the water of crystallization, turning into anhydrous copper(II) sulphate (CuSO\u2084), which is white or off-white. The colour change is a classic demonstration of the role of water of crystallization.
\n<\/section>\n
\nThe blue colour of hydrated copper sulphate is caused by the presence of water molecules bound within the crystal structure.
\n<\/section>\n
\nThe process of heating hydrated copper sulphate to remove water is an example of dehydration. The reverse process, adding water to anhydrous copper sulphate, will restore the blue colour and is often used as a test for the presence of water. Other metal salts also form coloured hydrates where water of crystallization affects the colour.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Copper sulphate crystals available in the market are blue coloured crystals. By careful heating, they turn to white colour. Which one of the following is responsible for the blue colour ? [amp_mcq option1=”Oxygen” option2=”Nitrogen” option3=”Water” option4=”Hydrogen” correct=”option3″] This question was previously asked in UPSC NDA-1 – 2023 Download PDFAttempt Online Copper sulphate crystals available in … <\/p>\n

Detailed SolutionCopper sulphate crystals available in the market are blue coloured cry<\/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":[1093],"tags":[1105,1096,1239],"class_list":["post-87998","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1105","tag-chemistry","tag-inorganic-chemistry","no-featured-image-padding"],"yoast_head":"\nCopper sulphate crystals available in the market are blue coloured cry<\/title>\n<meta name=\"description\" content=\"Copper sulphate crystals available in the market are typically copper(II) sulphate pentahydrate (CuSO\u2084\u00b75H\u2082O). The blue colour is due to the presence of water molecules coordinated to the copper ions in the crystal lattice. When heated, these crystals lose the water of crystallization, turning into anhydrous copper(II) sulphate (CuSO\u2084), which is white or off-white. The colour change is a classic demonstration of the role of water of crystallization. The blue colour of hydrated copper sulphate is caused by the presence of water molecules bound within the crystal structure.\" \/>\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\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Copper sulphate crystals available in the market are blue coloured cry\" \/>\n<meta property=\"og:description\" content=\"Copper sulphate crystals available in the market are typically copper(II) sulphate pentahydrate (CuSO\u2084\u00b75H\u2082O). The blue colour is due to the presence of water molecules coordinated to the copper ions in the crystal lattice. When heated, these crystals lose the water of crystallization, turning into anhydrous copper(II) sulphate (CuSO\u2084), which is white or off-white. The colour change is a classic demonstration of the role of water of crystallization. The blue colour of hydrated copper sulphate is caused by the presence of water molecules bound within the crystal structure.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T06:59:21+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":"Copper sulphate crystals available in the market are blue coloured cry","description":"Copper sulphate crystals available in the market are typically copper(II) sulphate pentahydrate (CuSO\u2084\u00b75H\u2082O). The blue colour is due to the presence of water molecules coordinated to the copper ions in the crystal lattice. When heated, these crystals lose the water of crystallization, turning into anhydrous copper(II) sulphate (CuSO\u2084), which is white or off-white. The colour change is a classic demonstration of the role of water of crystallization. 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The colour change is a classic demonstration of the role of water of crystallization. The blue colour of hydrated copper sulphate is caused by the presence of water molecules bound within the crystal structure.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T06:59:21+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\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/","url":"https:\/\/exam.pscnotes.com\/mcq\/copper-sulphate-crystals-available-in-the-market-are-blue-coloured-cry\/","name":"Copper sulphate crystals available in the market are blue coloured cry","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T06:59:21+00:00","dateModified":"2025-06-01T06:59:21+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Copper sulphate crystals available in the market are typically copper(II) sulphate pentahydrate (CuSO\u2084\u00b75H\u2082O). The blue colour is due to the presence of water molecules coordinated to the copper ions in the crystal lattice. When heated, these crystals lose the water of crystallization, turning into anhydrous copper(II) sulphate (CuSO\u2084), which is white or off-white. The colour change is a classic demonstration of the role of water of crystallization. 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