{"id":7003,"date":"2024-04-15T02:37:29","date_gmt":"2024-04-15T02:37:29","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=7003"},"modified":"2024-04-15T02:37:29","modified_gmt":"2024-04-15T02:37:29","slug":"residual-chlorine-in-water-is-determined-by-a-starch-iodide-method-b-orthotolidine-method-c-both-a-and-b-d-none-of-the-above","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/residual-chlorine-in-water-is-determined-by-a-starch-iodide-method-b-orthotolidine-method-c-both-a-and-b-d-none-of-the-above\/","title":{"rendered":"Residual chlorine in water is determined by A. Starch iodide method B. Orthotolidine method C. Both (A) and (B) D. None of the above"},"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_6a97a23c866e2\">\r\n                                            <div class=\"option\" data-option-key=\"option1\" data-is-correct=\"false\">\r\n                    Starch iodide method                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option2\" data-is-correct=\"false\">\r\n                    Orthotolidine method                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option3\" data-is-correct=\"true\">\r\n                    Both (A) and (B)                <\/div>\r\n                                            <div class=\"option\" data-option-key=\"option4\" data-is-correct=\"false\">\r\n                    None of the above                <\/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: C. Both (A) and (B).<\/p>\n<p>Residual chlorine is the amount of chlorine that remains in water after it has been treated. It is used to kill bacteria and other microorganisms in water. There are two main methods for determining residual chlorine in water: the starch iodide method and the orthotolidine method.<\/p>\n<p>The starch iodide method is a simple and inexpensive method that is often used in homes and small businesses. It involves adding a few drops of starch solution to a sample of water and then adding a few drops of iodine solution. If there is residual chlorine in the water, a blue-black color will develop.<\/p>\n<p>The orthotolidine method is a more accurate method that is often used in laboratories and large businesses. It involves adding a few drops of orthotolidine solution to a sample of water and then adding a few drops of a <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> reducing agent. If there is residual chlorine in the water, a yellow color will develop.<\/p>\n<p>Both the starch iodide method and the orthotolidine method are effective methods for determining residual chlorine in water. The choice of method will depend on the specific needs of the user.<\/p>\n<p>Here is a brief explanation of each option:<\/p>\n<ul>\n<li>Option A: Starch iodide method. The starch iodide method is a simple and inexpensive method that is often used in homes and small businesses. It involves adding a few drops of starch solution to a sample of water and then adding a few drops of iodine solution. If there is residual chlorine in the water, a blue-black color will develop.<\/li>\n<li>Option B: Orthotolidine method. The orthotolidine method is a more accurate method that is often used in laboratories and large businesses. It involves adding a few drops of orthotolidine solution to a sample of water and then adding a few drops of a reducing agent. If there is residual chlorine in the water, a yellow color will develop.<\/li>\n<li>Option C: Both (A) and (B). Both the starch iodide method and the orthotolidine method are effective methods for determining residual chlorine in water. <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 11.4 132.3c6.3 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> The choice of method will depend on the specific needs of the user.<\/li>\n<li>Option D: None of the above. None of the options are correct.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Join Our Telegram Channel 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":[647],"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>Residual chlorine in water is determined by A. Starch iodide method B. Orthotolidine method C. Both (A) and (B) D. 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