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easyQ. No. 14864

जिंक की dilute hydrochloric acid से अभिक्रिया कराने पर कौन-सी गैस निकलती है?

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जिंक dilute hydrochloric acid से अभिक्रिया करके zinc chloride और hydrogen gas बनाता है। Zinc reactivity series में hydrogen से ऊपर है, इसलिए वह acid से hydrogen ions को displace करता है। विस्तृत अवधारणा: Reactivity series में hydrogen से ऊपर स्थित metals dilute non-oxidising acids से सामान्यतः hydrogen gas निकालते हैं। Copper dilute HCl से सामान्यतः reaction नहीं करता, क्योंकि वह hydrogen से नीचे है।

Aऑक्सीजन
Bहाइड्रोजन
Cनाइट्रोजन
Dक्लोरीन
Correct Answer: हाइड्रोजनYour Answer: B

Explanation

सही उत्तर: विकल्प B - हाइड्रोजन। Zn + 2HCl → ZnCl₂ + H₂ में zinc hydrochloric acid से hydrogen को displace करता है।

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How many chemistry questions typically appear in the SSC CGL exam?

Chemistry usually contributes a handful of questions within the General Awareness section, generally covering basic concepts rather than calculation-heavy problems.

Which chemistry topics are most important for SSC CGL preparation?

Atomic structure, periodic table trends, acids-bases-salts, metals and non-metals, and carbon compounds are the areas that appear most consistently across past papers.

Is NCERT chemistry enough to prepare for SSC CGL?

NCERT textbooks from classes 9 and 10 cover most of the conceptual base needed, though supplementing with general knowledge about everyday chemical compounds helps too.

What is the best way to remember chemical reactions and formulas for SSC CGL?

Linking reactions to real-world examples, like rusting or antacids, makes them easier to recall than memorizing formulas in isolation.

Does the SSC CGL chemistry syllabus overlap with the school board syllabus?

Yes, a large part of the syllabus mirrors class 9 and 10 science, making school-level revision a practical starting point.

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