{"id":21620,"date":"2024-04-15T06:08:42","date_gmt":"2024-04-15T06:08:42","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=21620"},"modified":"2024-04-15T06:08:42","modified_gmt":"2024-04-15T06:08:42","slug":"among-the-various-allotrope-of-carbon-a-coke-is-the-hardest-graphite-is-the-softest-b-diamond-is-the-hardest-coke-is-the-softest-c-diamond-is-the-hardest-graphite-is-the-softest-d-diamond-is-th","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/among-the-various-allotrope-of-carbon-a-coke-is-the-hardest-graphite-is-the-softest-b-diamond-is-the-hardest-coke-is-the-softest-c-diamond-is-the-hardest-graphite-is-the-softest-d-diamond-is-th\/","title":{"rendered":"Among the various allotrope of carbon A. Coke is the hardest, graphite is the softest B. Diamond is the hardest, coke is the softest C. Diamond is the hardest, graphite is the softest D. Diamond is the hardest, lamp black is the softest"},"content":{"rendered":"<p>\r\n    <!-- Check if it's an AMP page -->\r\n            <!-- Non-AMP version -->\r\n        <div class=\"mcq-container\" data-quiz-id=\"quizState_6a99176df3578\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    Coke is the hardest, graphite is the softest                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    Diamond is the hardest, coke is the softest                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"true\">\r\n                    Diamond is the hardest, graphite is the softest                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    Diamond is the hardest, lamp black is the softest                <\/div>\r\n                            \r\n            <!-- Feedback messages for non-AMP -->\r\n            <div class=\"feedback\" data-feedback=\"wrong\">Answer is Right!<\/div>\r\n            <div class=\"feedback\" data-feedback=\"right\">Answer is Wrong!<\/div>\r\n        <\/div>\r\n\r\n        <script>\r\n        document.addEventListener('DOMContentLoaded', function () {\r\n            var containers = document.querySelectorAll('.mcq-container');\r\n\r\n            containers.forEach(function(container) {\r\n                var options = container.querySelectorAll('.option');\r\n                var feedbackSelect = container.querySelector('[data-feedback=\"select\"]');\r\n                var feedbackWrong = container.querySelector('[data-feedback=\"wrong\"]');\r\n                var feedbackRight = container.querySelector('[data-feedback=\"right\"]');\r\n\r\n                options.forEach(function(option) {\r\n                    option.addEventListener('click', function() {\r\n                        var selectedOption = option.getAttribute('data-option-key');\r\n                        var isCorrect = option.getAttribute('data-is-correct') === 'true';\r\n\r\n                        \/\/ Remove previous selections\r\n                        options.forEach(function(opt) {\r\n                            opt.classList.remove('correct', 'incorrect');\r\n                        });\r\n\r\n                        \/\/ Add the correct\/incorrect class\r\n                        if (isCorrect) {\r\n                            option.classList.add('correct');\r\n                            feedbackRight.hidden = false;\r\n                            feedbackWrong.hidden = true;\r\n                        } else {\r\n                            option.classList.add('incorrect');\r\n                            feedbackRight.hidden = true;\r\n                            feedbackWrong.hidden = false;\r\n                        }\r\n\r\n                        \/\/ Hide select feedback\r\n                        feedbackSelect.hidden = true;\r\n                    });\r\n                });\r\n            });\r\n        });\r\n        <\/script>\r\n    \r\n    <!--more--><\/p>\n<p>The correct answer is: <strong>C. Diamond is the hardest, graphite is the softest.<\/strong><\/p>\n<p>The other options are incorrect because:<\/p>\n<ul>\n<li>Coke is not an allotrope of carbon. It is a solid form of carbon that is produced by heating coal in the absence of air.<\/li>\n<li>Lamp black is a fine black powder that is produced by incomplete combustion of carbonaceous materials. It is not an allotrope of carbon.<\/li>\n<\/ul>\n<p>Graphite is a soft, black, lustrous form of carbon that is used in pencils and lubricants. It is made up of layers of carbon atoms that are arranged in a hexagonal lattice. The layers are held together by weak van der Waals forces, which allows them to slide past each other. This makes graphite a good lubricant.<\/p>\n<p>Diamond is a hard, colorless, transparent form of carbon that is the hardest natural substance on Earth. It is made up of <div class=\"youtube-subscribe-container\">\r\n        <a href=\"https:\/\/www.youtube.com\/channel\/UCNHT8lW-JmLC68rjBfZhdkg?sub_confirmation=1\" target=\"_blank\" class=\"youtube-subscribe-button\">\r\n            <span class=\"youtube-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 576 512\">\r\n                    <path d=\"M549.7 124.1c-6.3-23.7-24.8-42.3-48.3-48.6C458.8 64 288 64 288 64S117.2 64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 <div class=\"telegram-channel-container\">\r\n        <a href=\"https:\/\/t.me\/pscnotes2025\" target=\"_blank\" class=\"telegram-channel-button\">\r\n            <span class=\"telegram-icon\">\r\n                <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 496 512\">\r\n                    <path fill=\"white\" d=\"M248,8C111,8,0,119,0,256s111,248,248,248s248-111,248-248S385,8,248,8z M362,177L320,367c-3,14-10,18-20,14l-56-41l-27,26 c-3,3-5,5-10,5l4-63L323,196c5-5-1-7-8-3l-98,62l-42-13c-9-3-10-9,2-14l162-63C351,160,365,164,362,177z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Join Our Telegram Channel\r\n        <\/a>\r\n    <\/div> 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z\"\/>\r\n                <\/svg>\r\n            <\/span>\r\n            Subscribe on YouTube\r\n        <\/a>\r\n    <\/div> carbon atoms that are arranged in a tetrahedral lattice. The strong covalent bonds between the carbon atoms make diamond very hard.<\/p>\n<p>The hardness of a material is its resistance to deformation, such as scratching or indentation. The Mohs scale of mineral hardness is a qualitative scale that ranks the scratch resistance of various minerals. Diamond is the hardest mineral on the Mohs scale, with a hardness of 10. Graphite is the softest mineral on the Mohs scale, with a hardness of 1.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Subscribe on YouTube<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[692],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Among the various allotrope of carbon A. Coke is the hardest, graphite is the softest B. 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