{"id":88396,"date":"2025-06-01T07:09:31","date_gmt":"2025-06-01T07:09:31","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88396"},"modified":"2025-06-01T07:09:31","modified_gmt":"2025-06-01T07:09:31","slug":"which-one-of-the-following-is-a-chemical-change-2","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-a-chemical-change-2\/","title":{"rendered":"Which one of the following is a chemical change ?"},"content":{"rendered":"

Which one of the following is a chemical change ?<\/p>\n

[amp_mcq option1=”Cutting of hair” option2=”Graying of hair naturally” option3=”Swelling of resin in water” option4=”Cutting of fruit” correct=”option2″]<\/p>\n

\n
\n
This question was previously asked in<\/div>\n
UPSC NDA-2 – 2017<\/div>\n<\/div>\n
Download PDF<\/a>Attempt Online<\/a><\/div>\n<\/div>\n
\nA chemical change results in the formation of new substances with different chemical properties.
\nA) Cutting of hair is a physical change; the hair material itself (keratin) remains chemically unchanged, only its physical shape and size are altered.
\nB) Graying of hair naturally involves chemical changes in the hair follicle where the production of melanin (the pigment that gives hair its color) decreases or stops. This is a biological process that alters the chemical composition of the hair shaft over time, leading to a change in color. It is an irreversible change at the level of pigment production.
\nC) Swelling of resin in water is a physical change; the resin absorbs water but its chemical composition does not fundamentally change. This is often a process of hydration or dissolution\/dispersion.
\nD) Cutting of fruit is primarily a physical change; the fruit’s chemical composition remains the same, although the exposed surface might subsequently undergo chemical reactions like oxidation (browning), but the act of cutting is physical.
\nTherefore, graying of hair is a chemical change.
\n<\/section>\n
\n– Chemical change involves the formation of new substances.
\n– Physical change alters form or appearance without changing chemical composition.
\n– Graying of hair involves a change in pigment (melanin) production, a chemical\/biological process.
\n<\/section>\n
\nDistinguishing between physical and chemical changes is a fundamental concept in chemistry. Physical changes are often easily reversible (e.g., melting ice), while chemical changes are typically irreversible under normal conditions (e.g., burning wood). Clues for chemical change include color change (not due to mixing), gas production, heat absorption or release, and precipitate formation.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following is a chemical change ? [amp_mcq option1=”Cutting of hair” option2=”Graying of hair naturally” option3=”Swelling of resin in water” option4=”Cutting of fruit” correct=”option2″] This question was previously asked in UPSC NDA-2 – 2017 Download PDFAttempt Online A chemical change results in the formation of new substances with different chemical properties. A) … <\/p>\n

Detailed SolutionWhich one of the following is a chemical change ?<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1094],"tags":[1101,1096,1155],"class_list":["post-88396","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-2","tag-1101","tag-chemistry","tag-physical-and-chemical-changes-solution","no-featured-image-padding"],"yoast_head":"\nWhich one of the following is a chemical change ?<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-is-a-chemical-change-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Which one of the following is a chemical change ?\" \/>\n<meta property=\"og:description\" content=\"Which one of the following is a chemical change ? 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[amp_mcq option1=”Cutting of hair” option2=”Graying of hair naturally” option3=”Swelling of resin in water” option4=”Cutting of fruit” correct=”option2″] This question was previously asked in UPSC NDA-2 – 2017 Download PDFAttempt Online A chemical change results in the formation of new substances with different chemical properties. A) ... 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