Gas which has percentage equal to 78% in air is the
Correct answer: D. Nitrogen
- A. Oxygen
- B. Hydrogen
- C. Carbon dioxide
- D. Nitrogen
Explanation
Air is composed of various gases, and nitrogen makes up the largest portion, roughly 78%. Oxygen is the second most abundant gas in air, making up about 21%.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
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