{"id":400879,"date":"2023-01-11T10:13:17","date_gmt":"2023-01-11T04:43:17","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/question\/account-for-the-followingi-copperi-compounds-are-white-whereas-copper-ii-compounds-are-colored-ii-chromates-change-their-color-when-kept-in-an-acidic-solution-iii-zn-cd-hg-are-considered\/"},"modified":"2025-06-19T20:09:10","modified_gmt":"2025-06-19T14:39:10","slug":"account-for-the-followingi-copperi-compounds-are-white-whereas-copper-ii-compounds-are-colored-ii-chromates-change-their-color-when-kept-in-an-acidic-solution-iii-zn-cd-hg-are-considered","status":"publish","type":"questions","link":"https:\/\/infinitylearn.com\/surge\/question\/chemistry\/account-for-the-followingi-copperi-compounds-are-white\/","title":{"rendered":"Account for the following:(i) Copper(I) compounds are white whereas Copper (II) compounds are colored.(ii) Chromates change their color when kept in an acidic solution.(iii) Zn, Cd, Hg are considered as d-block elements but not as transition elements."},"content":{"rendered":"","protected":false},"author":1,"template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Account for the following:(i) Copper(I) compounds are white whereas Copper (II) compounds are colored.(ii) Chromates change their color when kept in an acidic solution.(iii) Zn, Cd, Hg are considered as d-block elements but not as transition elements.","custom_permalink":"question\/chemistry\/account-for-the-followingi-copperi-compounds-are-white\/"},"categories":[],"acf":{"question":"<p>Account for the following:<br>(i) Copper(I) compounds are white whereas Copper (II) compounds are colored.<br>(ii) Chromates change their color when kept in an acidic solution.<br>(iii) Zn, Cd, Hg are considered as d-block elements but not as transition elements.<\/p>","options":null,"solution":"<p>(i) Copper (I) compounds are white whereas Copper (II) compounds are colored because, in&nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msup><mi>Cu<\/mi><mrow><mo>+<\/mo><mn>1<\/mn><\/mrow><\/msup><mfenced separators=\"|\"><mrow><mn>3<\/mn><msup><mi mathvariant=\"normal\">d<\/mi><mn>10<\/mn><\/msup><\/mrow><\/mfenced><\/math>&nbsp;there is absence of unpaired electrons while in&nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><msup><mi>Cu<\/mi><mrow><mo>+<\/mo><mn>2<\/mn><\/mrow><\/msup><mfenced separators=\"|\"><mrow><mn>3<\/mn><msup><mi mathvariant=\"normal\">d<\/mi><mn>9<\/mn><\/msup><\/mrow><\/mfenced><\/math>&nbsp;compounds are colored due to unpaired e- shows d-d transition.<br>(ii) Chromate&nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mfenced separators=\"|\"><msup><msub><mi>CrO<\/mi><mn>4<\/mn><\/msub><mrow><mn>2<\/mn><mo>\u2212<\/mo><\/mrow><\/msup><\/mfenced><\/math>&nbsp;changes to dichromate&nbsp;<math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\"><mfenced separators=\"|\"><msup><mrow><msub><mi>Cr<\/mi><mn>2<\/mn><\/msub><msub><mi mathvariant=\"normal\">O<\/mi><mn>7<\/mn><\/msub><\/mrow><mrow><mn>2<\/mn><mo>\u2212<\/mo><\/mrow><\/msup><\/mfenced><\/math>&nbsp;ion in acidic medium, hence color is changed.<br>(iii) Due to completely filled d-orbitals in their ground state as well as in oxidized state, Zn, Cd, Hg are considered as d-block elements but not as transition elements.<\/p>","subject":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v17.9 - 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