{"id":87740,"date":"2025-06-01T06:53:14","date_gmt":"2025-06-01T06:53:14","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=87740"},"modified":"2025-06-01T06:53:14","modified_gmt":"2025-06-01T06:53:14","slug":"which-one-of-the-following-statements-about-dihydrogen-h%e2%82%82-is-not-cor","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/which-one-of-the-following-statements-about-dihydrogen-h%e2%82%82-is-not-cor\/","title":{"rendered":"Which one of the following statements about dihydrogen (H\u2082) is not cor"},"content":{"rendered":"

Which one of the following statements about dihydrogen (H\u2082) is not correct ?<\/p>\n

[amp_mcq option1=”H\u2082 is lighter than air and insoluble in water.” option2=”H\u2082 is inert at room temperature due to high H \u2013 H bond dissociation enthalpy.” option3=”H\u2082 reacts with alkali metals at high temperature to yield metal hydrides.” option4=”A mixture of NO\u2082 and H\u2082 is known as Syngas.” correct=”option4″]<\/p>\n

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This question was previously asked in<\/div>\n
UPSC NDA-1 – 2021<\/div>\n<\/div>\n
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\nThe statement “A mixture of NO\u2082 and H\u2082 is known as Syngas” is not correct. Syngas (synthesis gas) is primarily a mixture of carbon monoxide (CO) and hydrogen (H\u2082).
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\nSyngas is a fuel gas mixture that can be produced from various carbon-containing materials like natural gas, coal, biomass, or plastic waste. It is used as a fuel or as an intermediate for the production of other chemicals like methanol and ammonia. Nitrogen dioxide (NO\u2082) is a toxic gas primarily associated with air pollution.
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\nDihydrogen (H\u2082) is indeed lighter than air and practically insoluble in water. Its high H\u2013H bond dissociation enthalpy (435 kJ\/mol) makes it quite stable and inert at room temperature. At high temperatures, it reacts with alkali metals (like Na, K, Li) to form ionic hydrides (e.g., 2Na + H\u2082 \u2192 2NaH), where hydrogen acts as an anion (H\u207b).
\n<\/section>\n","protected":false},"excerpt":{"rendered":"

Which one of the following statements about dihydrogen (H\u2082) is not correct ? [amp_mcq option1=”H\u2082 is lighter than air and insoluble in water.” option2=”H\u2082 is inert at room temperature due to high H \u2013 H bond dissociation enthalpy.” option3=”H\u2082 reacts with alkali metals at high temperature to yield metal hydrides.” option4=”A mixture of NO\u2082 and … <\/p>\n

Detailed SolutionWhich one of the following statements about dihydrogen (H\u2082) is not cor<\/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":[1093],"tags":[1110,1096,1161],"class_list":["post-87740","post","type-post","status-publish","format-standard","hentry","category-upsc-nda-1","tag-1110","tag-chemistry","tag-hydrogen-and-its-compounds","no-featured-image-padding"],"yoast_head":"\nWhich one of the following statements about dihydrogen (H\u2082) is not cor<\/title>\n<meta name=\"description\" content=\"The statement "A mixture of NO\u2082 and H\u2082 is known as Syngas" is not correct. Syngas (synthesis gas) is primarily a mixture of carbon monoxide (CO) and hydrogen (H\u2082). Syngas is a fuel gas mixture that can be produced from various carbon-containing materials like natural gas, coal, biomass, or plastic waste. It is used as a fuel or as an intermediate for the production of other chemicals like methanol and ammonia. Nitrogen dioxide (NO\u2082) is a toxic gas primarily associated with air pollution.\" \/>\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-statements-about-dihydrogen-h\u2082-is-not-cor\/\" \/>\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 statements about dihydrogen (H\u2082) is not cor\" \/>\n<meta property=\"og:description\" content=\"The statement "A mixture of NO\u2082 and H\u2082 is known as Syngas" is not correct. Syngas (synthesis gas) is primarily a mixture of carbon monoxide (CO) and hydrogen (H\u2082). Syngas is a fuel gas mixture that can be produced from various carbon-containing materials like natural gas, coal, biomass, or plastic waste. It is used as a fuel or as an intermediate for the production of other chemicals like methanol and ammonia. 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Syngas (synthesis gas) is primarily a mixture of carbon monoxide (CO) and hydrogen (H\u2082). Syngas is a fuel gas mixture that can be produced from various carbon-containing materials like natural gas, coal, biomass, or plastic waste. It is used as a fuel or as an intermediate for the production of other chemicals like methanol and ammonia. 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