{"id":88358,"date":"2025-06-01T07:08:41","date_gmt":"2025-06-01T07:08:41","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=88358"},"modified":"2025-06-01T07:08:41","modified_gmt":"2025-06-01T07:08:41","slug":"when-pure-water-boils-vigorously-the-bubbles-that-rise-to-the-surface","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/when-pure-water-boils-vigorously-the-bubbles-that-rise-to-the-surface\/","title":{"rendered":"When pure water boils vigorously, the bubbles that rise to the surface"},"content":{"rendered":"

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of<\/p>\n

[amp_mcq option1=”air” option2=”hydrogen” option3=”hydrogen and oxygen” option4=”water vapour” correct=”option4″]<\/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
\nWhen pure water boils vigorously, the process involves the phase transition of liquid water into gaseous water.
\n<\/section>\n
\nBoiling occurs when the vapour pressure of the liquid equals the surrounding atmospheric pressure, and the liquid turns into gas within the bulk of the liquid as well as at the surface. The bubbles formed during boiling are filled with the gaseous form of the liquid, which in this case is water vapour.
\n<\/section>\n
\nAir might be present as dissolved gas in water, and tiny air bubbles might be released upon heating before boiling, but the large, vigorous bubbles during boiling are predominantly water vapour. Water molecules (H\u2082O) decompose into hydrogen and oxygen only under extreme conditions (like electrolysis), not during simple boiling.
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of [amp_mcq option1=”air” option2=”hydrogen” option3=”hydrogen and oxygen” option4=”water vapour” correct=”option4″] This question was previously asked in UPSC NDA-2 – 2017 Download PDFAttempt Online When pure water boils vigorously, the process involves the phase transition of liquid water into gaseous water. … <\/p>\n

Detailed SolutionWhen pure water boils vigorously, the bubbles that rise to the surface<\/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-88358","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":"\nWhen pure water boils vigorously, the bubbles that rise to the surface<\/title>\n<meta name=\"description\" content=\"When pure water boils vigorously, the process involves the phase transition of liquid water into gaseous water. Boiling occurs when the vapour pressure of the liquid equals the surrounding atmospheric pressure, and the liquid turns into gas within the bulk of the liquid as well as at the surface. 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