{"id":24,"date":"2020-09-16T04:30:40","date_gmt":"2020-09-16T04:30:40","guid":{"rendered":"http:\/\/www.web.ichemc.edu.lk\/cosl\/?page_id=24"},"modified":"2025-10-21T03:15:24","modified_gmt":"2025-10-21T03:15:24","slug":"past-papers","status":"publish","type":"page","link":"http:\/\/www.web.ichemc.edu.lk\/cosl\/past-papers\/","title":{"rendered":"Past Papers"},"content":{"rendered":"\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:66.66%\">\n<h4 class=\"wp-block-heading\">Sri Lanka National Chemistry Olympiad<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Preliminary Examination 2025 Full PDF ( <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/SLNChO-2025-English-final-print-n.pdf\" data-type=\"link\" data-id=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/SLNChO-2025-English-final-print-n.pdf\">English<\/a>, <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/SLNChO-2025-Sinhala-.pdf\">Sinhala<\/a>, <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/SLNChO-2025-tamil-translated_print-final.pdf\">Tamil<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2024 Full PDF ( <a href=\"https:\/\/drive.google.com\/file\/d\/1lnZE0DwckEjj-Zplk-9V__DJ5sG0z6f7\/view?usp=drive_link\">English<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1Tbk1_xdhAaPYRhJI-kzsqUYCqHONOecY\/view?usp=drive_link\">Sinhala<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1J9VZ_58ws-XE5NnFH5HPwoGsLLElFrf4\/view?usp=drive_link\">Tamil<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2023 Full PDF (<a href=\"https:\/\/drive.google.com\/file\/d\/1lBI9HBB2keqQBmyez0DAncX-tvKDGEOF\/view?usp=drive_link\">English<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1BQrfk6Sbh1-HOyZItsi-ucdrcSEP9xwo\/view?usp=drive_link\">Sinhala<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1CwYA_mHZSaXvOBuErfsXeQ1CU7zaWlhZ\/view?usp=drive_link\">Tamil<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2022 Full PDF (<a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-English.pdf\">English<\/a>\/<a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-English-Answers.pdf\">Answers<\/a>, <a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-Sinhala.pdf\">Sinhala<\/a>\/<a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-Sinhala-Anwers.pdf\">Answers<\/a>, <a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-Tamil.pdf\">Tamil<\/a>\/<a href=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2023\/02\/CHO-Tamil-Answers.pdf\">Answers<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2020 Full PDF (<a href=\"https:\/\/drive.google.com\/file\/d\/1RDoQ-ri5njN7b6fLW0QJAa7Surmfl35n\/view?usp=sharing\">English<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1wVVRTXcWnt1XlAzIp_ziUWn7dNm515Pt\/view?usp=sharing\">Sinhala<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1LHzKhYB6EYMvJi2aIO4CL0XeorBcdL4B\/view?usp=sharing\">Tamil<\/a>, <a href=\"https:\/\/drive.google.com\/file\/d\/1cyg7XT6p-86lNt_qdkYgHeK6QvLVbwxl\/view?usp=sharing\">MCQ answers<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2019 Full PDF (<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2019\/10\/Chemistry-Olympiad-Preliminary-Exam-English.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">English<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2019\/10\/Chemistry-Olympiad-Preliminary-Exam-Sinhala.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Sinhala<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2019\/10\/Chemistry-Olympiad-Preliminary-Exam-Tamil.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Tamil<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2019\/10\/Answers-for-MCQs-2019-1.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">MCQ answers<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2015\/11\/Marking-Scheme-Final.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Structured answers<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2018 link for MCQs with solutions (<a href=\"https:\/\/exaper.com\/products\/paper?stream=chemistry_olympiad&amp;medium=en_US&amp;author=dr--c--n--ratnaweera&amp;subject=chemistry-a\/l-english-chemistry_olympiad\" target=\"_blank\" rel=\"noopener noreferrer\">English<\/a>,&nbsp;<a href=\"https:\/\/exaper.com\/products\/paper?stream=chemistry_olympiad&amp;medium=si_LK&amp;author=dr--c--n--ratnaweera&amp;subject=%E0%B6%BB%E0%B7%83%E0%B7%8F%E0%B6%BA%E0%B6%B1-%E0%B7%80%E0%B7%92%E0%B6%AF%E0%B7%8A%E2%80%8D%E0%B6%BA%E0%B7%8F%E0%B7%80-a\/l-sinhala-chemistry_olympiad\" target=\"_blank\" rel=\"noopener noreferrer\">Sinhala<\/a>,&nbsp;<a href=\"https:\/\/exaper.com\/products\/paper?stream=chemistry_olympiad&amp;medium=ta_LK&amp;author=dr--c--n--ratnaweera&amp;subject=%E0%AE%87%E0%AE%B0%E0%AE%9A%E0%AE%BE%E0%AE%AF%E0%AE%A9%E0%AE%B5%E0%AE%BF%E0%AE%AF%E0%AE%B2%E0%AF%8D-a\/l-tamil-chemistry_olympiad\" target=\"_blank\" rel=\"noopener noreferrer\">Tamil<\/a>)<\/li>\n\n\n\n<li>Preliminary Examination 2018 Full PDF (<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2018\/12\/PapOLY-2018-English.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">English<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2018\/12\/PapOLY-2018-Sinhala.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Sinhala<\/a>,&nbsp;<a href=\"http:\/\/www.ichemc.edu.lk\/wp-content\/uploads\/2018\/12\/PapOLY-2018-Tamil.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">Tamil<\/a>)<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Sri Lanka Junior Chemistry Olympiad<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Examination 2025 Full PDF ( <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/Junior-Olympiad-2025-final-for-print-English.pdf\">English<\/a>, <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/Final-Junior-Olympiad-2025-19th-January-Sinhala-print.pdf\">Sinhala<\/a>, <a href=\"https:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/Junior-Olympiad-2025-_-tamil-translated-final.pdf\">Tamil<\/a>)<\/li>\n<\/ul>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:33.33%\">\n<figure class=\"wp-block-image alignwide size-full\"><img decoding=\"async\" src=\"http:\/\/www.web.ichemc.edu.lk\/cosl\/wp-content\/uploads\/sites\/4\/2025\/10\/cropped-COSL-logo800px.png\" alt=\"\" class=\"wp-image-2039\"\/><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sri Lanka National Chemistry Olympiad Sri Lanka Junior Chemistry Olympiad<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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