Why is air not considered a compound?हवा को compound क्यों नहीं माना जाता?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: Because gases are not chemically combined in fixed ratioक्योंकि gases chemically fixed ratio में combined नहीं हैं
The direct answer is B: air is not a compound because its gases are not chemically combined in a fixed ratio. A compound is a pure substance formed when elements combine chemically in a definite proportion, giving it a fixed composition and characteristic properties. Air is mainly a physical mixture of gases such as nitrogen, oxygen, argon, and carbon dioxide. Their amounts can vary with location, pollution, altitude, humidity, and other conditions, and each gas largely retains its own properties. Option A is wrong because air is not always solid; it is normally a gas. Option B is correct because variable composition and absence of a single fixed chemical formula show that air is a mixture, not a compound. Option C is wrong because air has mass and can exert pressure. Option D is wrong because invisibility does not decide whether something is a compound; many compounds are invisible gases. Exam cue: fixed ratio and chemical bonding mean compound; variable composition and physical mixing mean mixture.सीधा उत्तर B है: air को compound नहीं माना जाता क्योंकि उसमें उपस्थित gases fixed ratio में chemically combined नहीं हैं। Compound वह pure substance है जिसमें elements निश्चित अनुपात में chemical bonding से जुड़े होते हैं; उसका composition और सामान्यतः formula निश्चित होता है। Air मुख्यतः nitrogen, oxygen, argon और carbon dioxide जैसी gases का physical mixture है। इन gases की मात्रा स्थान, pollution, altitude, humidity और अन्य conditions के अनुसार बदल सकती है, और वे largely अपने-अपने गुण बनाए रखती हैं। A गलत है क्योंकि air हमेशा solid नहीं, सामान्यतः gas है। B सही है क्योंकि variable composition और एक निश्चित chemical formula का न होना mixture को दिखाता है। C गलत है क्योंकि air का mass होता है और वह pressure डालती है। D गलत है क्योंकि दिखाई न देना compound या mixture होने का प्रमाण नहीं है; कई compounds भी अदृश्य gases होते हैं। परीक्षा संकेत: fixed ratio और chemical bonding compound के लक्षण हैं; variable composition mixture का।
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