{"id":21540,"date":"2022-01-30T13:55:26","date_gmt":"2022-01-30T08:25:26","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=21540"},"modified":"2024-12-16T11:57:21","modified_gmt":"2024-12-16T06:27:21","slug":"food-stuffs-viva-questions-with-answers","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/","title":{"rendered":"Food Stuffs Viva Questions with Answers"},"content":{"rendered":"

Tests of Carbohydrates, Fats and Proteins in Pure Samples and Detection of Their Presence in Given Food Stuffs Viva Questions with Answers<\/strong><\/span><\/h2>\n

Question.1. What are carbohydrates?<\/strong>
\nAnswer.<\/strong> Carbohydrates are polyhydroxy aldehydes or polydroxy ketones or the compounds which yield these on hydrolysis. .<\/p>\n

Question.2. Give two examples of monosaccharides.<\/strong>
\nAnswer.<\/strong> Glucose and fructose.<\/p>\n

Question.3. Give two examples of disaccharides.<\/strong>
\nAnswer.<\/strong> Sucrose and maltose.<\/p>\n

Question.4. What is Tollen\u2019s reagent?<\/strong>
\nAnswer.<\/strong> A solution prepared by adding NaOH solution to AgNO3<\/sub> solution and then adding NH4<\/sub>OH to dissolve the ppt.<\/p>\n

Question.5. What are the functions of carbohydrates?<\/strong>
\nAnswer.<\/strong> 1. To supply energy to the body as bio fuel and to act as storage of chemical energy in the form of glycogen in liver.
\n2. As constituent of cell membranes.<\/p>\n

Question.6. Why do we get a red ppt. in Fehling\u2019s test?<\/strong>
\nAnswer.<\/strong> Because of the formation of cuprous oxide (Cu2<\/sub>0).<\/p>\n

Question.7. Why do we get a shining mirror in Tollen\u2019s test?<\/strong>
\nAnswer.<\/strong> Due to the formation of silver which deposits on the walls of test-tube.<\/p>\n

Question.8. What is Molisch\u2019s reagent?<\/strong>
\nAnswer.<\/strong> Alcoholic solution of a-naphthol.<\/p>\n

Question.9. What is purple ring formed due to in Molisch\u2019s test?<\/strong>
\nAnswer.<\/strong> Cone. H2<\/sub>SO4<\/sub> converts carbohydrates into furfural or its derivative which then reacts with a- naphthol to form a violet coloured compound.<\/p>\n

Question.10. Name some reducing and non-reducing sugars.<\/strong>
\nAnswer.<\/strong> Glucose and fructose are examples of reducing sugar and sucrose is an example of non-reducing sugar.<\/p>\n

Question.11. How will your distinguish between sucrose and glucose?<\/strong>
\nAnswer.<\/strong> Glucose, being a reducing sugar, will give silver mirror test positive (Sucrose is a non reducing sugar).<\/p>\n

Question.12. What is the role of tartarate ions in Fehling\u2019s reagent?<\/strong>
\nAnswer.<\/strong> It acts as complexing agent and prevents the precipitation of copper (II) hydroxide.<\/p>\n

Question.13. What is the role of citrate ions in Benedict\u2019s solution?<\/strong>
\nAnswer.<\/strong> It acts as complexing agent and prevents the precipitation of copper (II) hydroxide.<\/p>\n

Question.14. Explain why does fructose reduce Fehling\u2019s solution and Tollen\u2019s reagent inspite of the presence of ketonic group?<\/strong>
\nAnswer.<\/strong> In alkaline medium fructose rearranges to glucose and the two are equilibrium with each other (Lobry de Bruyn-van Ekenstein rearrangement).<\/p>\n

Question.15. What are Fehling A and Fehling B solutions?<\/strong>
\nAnswer.<\/strong> Fehling solution A is copper sulphate solution and Fehling solution B is mixture of solutions of sodium potassium tartrate and sodium hydroxide.<\/p>\n

Question.16. Do all the sugars give Fehling solution test?<\/strong>
\nAnswer.<\/strong> No, only reducing sugars like glucose and fructose give this test.<\/p>\n

Question.17. What are proteins? <\/strong>
\nAnswer.<\/strong> Proteins are naturally occurring complex nitrogenous organic substances with high molecular masses. Chemically, they are polypeptides formed by the condensation of alpha-amino acids.<\/p>\n

Question.18. What is the colour obtained in Ninhydrin test for proteins?<\/strong>
\nAnswer.<\/strong> Blue.<\/p>\n

Question.19. How are proteins affected by heat?<\/strong>
\nAnswer.<\/strong> They undergo coagulation.<\/p>\n

Question.20. How are proteins affected by cone. HNO3<\/sub>?<\/strong>
\nAnswer.<\/strong> Turn yellow.<\/p>\n

Question.21. What is the name given to the reaction between protein and cone. HNO3<\/sub>?<\/strong>
\nAnswer.<\/strong> Xanthoprotein reaction.<\/p>\n

Question.22. What are the final products of hydrolysis of proteins?<\/strong>
\nAnswer.<\/strong> a-Amino acids.<\/p>\n

Question.23. What is biuret test for proteins?<\/strong>
\nAnswer.<\/strong> To 2-3 ml of protein solution in a test-tube, add an equal volume of 10% NaOH solution. Mix thoroughly and add a few drops of 0.5% copper sulphate solution. A purple-violet colour is obtained, if protein is present.<\/p>\n

Question.24. What are oils and fats?<\/strong>
\nAnswer.<\/strong> Oils and fats are triesters of glycerol with higher fatty acids. They are also called triglycerides.<\/p>\n

Question.25. What is the difference between oils and fats?<\/strong>
\nAnswer.<\/strong> Oils are liquids at ordinary temperature. They contain higher proportion of unsaturated acids whereas fats are solids at ordinary temperature and contain higher proportion of saturated acids.<\/p>\n

Question.26. Name two tests for testing fats or lipids.<\/strong>
\nAnswer.<\/strong> (i) Solubility test (ii) Acrolein test.<\/p>\n

Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample Papers<\/p>\n","protected":false},"excerpt":{"rendered":"

Tests of Carbohydrates, Fats and Proteins in Pure Samples and Detection of Their Presence in Given Food Stuffs Viva Questions […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"\"Get Food Stuffs Viva Questions with Answers on Infinity Learn.\"","custom_permalink":"study-material\/science\/food-stuffs-viva-questions-with-answers\/"},"categories":[116,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"\nFood Stuffs Viva Questions with Answers - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\""Get Food Stuffs Viva Questions with Answers on Infinity Learn."\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Food Stuffs Viva Questions with Answers - Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"og:description\" content=\""Get Food Stuffs Viva Questions with Answers on Infinity Learn."\" \/>\n<meta property=\"og:url\" content=\"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/\" \/>\n<meta property=\"og:site_name\" content=\"Infinity Learn by Sri Chaitanya\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/\" \/>\n<meta property=\"article:published_time\" content=\"2022-01-30T08:25:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-12-16T06:27:21+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1920\" \/>\n\t<meta property=\"og:image:height\" content=\"1008\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@InfinityLearn_\" \/>\n<meta name=\"twitter:site\" content=\"@InfinityLearn_\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Prasad Gupta\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Food Stuffs Viva Questions with Answers - Infinity Learn by Sri Chaitanya","description":"\"Get Food Stuffs Viva Questions with Answers on Infinity Learn.\"","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/","og_locale":"en_US","og_type":"article","og_title":"Food Stuffs Viva Questions with Answers - Infinity Learn by Sri Chaitanya","og_description":"\"Get Food Stuffs Viva Questions with Answers on Infinity Learn.\"","og_url":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/","og_site_name":"Infinity Learn by Sri Chaitanya","article_publisher":"https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","article_published_time":"2022-01-30T08:25:26+00:00","article_modified_time":"2024-12-16T06:27:21+00:00","og_image":[{"width":1920,"height":1008,"url":"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2025\/04\/infinitylearn.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_creator":"@InfinityLearn_","twitter_site":"@InfinityLearn_","twitter_misc":{"Written by":"Prasad Gupta","Est. reading time":"3 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/infinitylearn.com\/surge\/#organization","name":"Infinity Learn","url":"https:\/\/infinitylearn.com\/surge\/","sameAs":["https:\/\/www.facebook.com\/InfinityLearn.SriChaitanya\/","https:\/\/www.instagram.com\/infinitylearn_by_srichaitanya\/","https:\/\/www.linkedin.com\/company\/infinity-learn-by-sri-chaitanya\/","https:\/\/www.youtube.com\/c\/InfinityLearnEdu","https:\/\/twitter.com\/InfinityLearn_"],"logo":{"@type":"ImageObject","@id":"https:\/\/infinitylearn.com\/surge\/#logo","inLanguage":"en-US","url":"","contentUrl":"","caption":"Infinity Learn"},"image":{"@id":"https:\/\/infinitylearn.com\/surge\/#logo"}},{"@type":"WebSite","@id":"https:\/\/infinitylearn.com\/surge\/#website","url":"https:\/\/infinitylearn.com\/surge\/","name":"Infinity Learn by Sri Chaitanya","description":"Surge","publisher":{"@id":"https:\/\/infinitylearn.com\/surge\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/infinitylearn.com\/surge\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#webpage","url":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/","name":"Food Stuffs Viva Questions with Answers - Infinity Learn by Sri Chaitanya","isPartOf":{"@id":"https:\/\/infinitylearn.com\/surge\/#website"},"datePublished":"2022-01-30T08:25:26+00:00","dateModified":"2024-12-16T06:27:21+00:00","description":"\"Get Food Stuffs Viva Questions with Answers on Infinity Learn.\"","breadcrumb":{"@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/infinitylearn.com\/surge\/"},{"@type":"ListItem","position":2,"name":"Food Stuffs Viva Questions with Answers"}]},{"@type":"Article","@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#article","isPartOf":{"@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#webpage"},"author":{"@id":"https:\/\/infinitylearn.com\/surge\/#\/schema\/person\/143c89c9c2f5e56ed91f96dde47b0b05"},"headline":"Food Stuffs Viva Questions with Answers","datePublished":"2022-01-30T08:25:26+00:00","dateModified":"2024-12-16T06:27:21+00:00","mainEntityOfPage":{"@id":"https:\/\/infinitylearn.com\/surge\/study-material\/science\/food-stuffs-viva-questions-with-answers\/#webpage"},"wordCount":642,"publisher":{"@id":"https:\/\/infinitylearn.com\/surge\/#organization"},"articleSection":["Science","Study Materials"],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/infinitylearn.com\/surge\/#\/schema\/person\/143c89c9c2f5e56ed91f96dde47b0b05","name":"Prasad Gupta","image":{"@type":"ImageObject","@id":"https:\/\/infinitylearn.com\/surge\/#personlogo","inLanguage":"en-US","url":"https:\/\/secure.gravatar.com\/avatar\/200104b443e586c76c46cadc113d931c?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/200104b443e586c76c46cadc113d931c?s=96&d=mm&r=g","caption":"Prasad Gupta"},"url":"https:\/\/infinitylearn.com\/surge\/author\/prasad\/"}]}},"_links":{"self":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/posts\/21540"}],"collection":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/comments?post=21540"}],"version-history":[{"count":0,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/posts\/21540\/revisions"}],"wp:attachment":[{"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/media?parent=21540"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/categories?post=21540"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/tags?post=21540"},{"taxonomy":"table_tags","embeddable":true,"href":"https:\/\/infinitylearn.com\/surge\/wp-json\/wp\/v2\/table_tags?post=21540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}