E-PolyLearning

306. Nitrogen gas is found in a group of the periodic table of
a. V
b. VII
c. VI
d. X
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Answer: (a).V

307. Nitrogen makes up 78% of the earth's atmosphere and is
a. metal
b. non-metallic
c. alkaline
d. amphoteric
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Answer: (b).non-metallic

308. Lightning during thunderstorm provides energy for reaction of
a. nitrogen only
b. oxygen only
c. carbon dioxide
d. nitrogen and oxygen
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Answer: (d).nitrogen and oxygen

309. The bond energy in triple covalent bond (≡) in nitrogen (N₂) is
a. 1000 kJmol⁻¹
b. 2000 kJmol⁻¹
c. 3000 kJmol⁻¹
d. 400 kJmol⁻¹
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Answer: (a).1000 kJmol⁻¹

310. Plants absorb nitrate ions essential for growth and make
a. proteins
b. minerals
c. carbohydrates
d. vitamins
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Answer: (a).proteins