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NEET Practice: Chemistry 6
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1.
The number of moles in 4 g of NaOH is:
(a) 0.1 mole
(b) 1 mole
(c) 0.5 mole
(d) 0.01 mole
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Correct Answer: (a) 0.1 mole
Explanation:
Molar mass NaOH = 40 g/mol → 4 g = 0.1 mole
2.
The oxidation state of Fe in FeCl₃ is:
(a) +2
(b) +3
(c) +1
(d) 0
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Correct Answer: (b) +3
Explanation:
x + 3(-1) = 0 → x = +3
3.
The pH of a neutral solution at 25°C is:
(a) 7
(b) 0
(c) 14
(d) 1
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Correct Answer: (a) 7
Explanation:
[H⁺] = [OH⁻] = 10⁻⁷ M → pH = 7
4.
The hybridisation of nitrogen in N₂ is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d
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Correct Answer: (a) sp
Explanation:
Triple bond → sp hybridisation
5.
The IUPAC name of CH₃CH₂CH₂COOH is:
(a) Propanoic acid
(b) Butanoic acid
(c) Pentanoic acid
(d) Ethanoic acid
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Correct Answer: (b) Butanoic acid
Explanation:
Four-carbon carboxylic acid
6.
The number of sigma bonds in CH₃-C≡CH is:
(a) 5
(b) 6
(c) 7
(d) 4
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Correct Answer: (b) 6
Explanation:
3 C-H + 2 C-C + 1 C≡C sigma = 6 sigma bonds
7.
The molarity of 9.8 g H₂SO₄ in 500 mL solution is:
(a) 0.2 M
(b) 0.1 M
(c) 0.4 M
(d) 1 M
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Correct Answer: (a) 0.2 M
Explanation:
Moles = 9.8 / 98 = 0.1, Volume = 0.5 L → M = 0.2
8.
The element with electronic configuration [Kr] 5s² 4d¹⁰ 5p⁴ is:
(a) Selenium
(b) Bromine
(c) Tellurium
(d) Iodine
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Correct Answer: (a) Selenium
Explanation:
Atomic number 34 → Selenium
9.
The functional group in alcohols is:
(a) -CHO
(b) -COOH
(c) -OH
(d) -NH₂
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Correct Answer: (c) -OH
Explanation:
Hydroxyl group (-OH)
10.
The shape of XeO₃ molecule is:
(a) Trigonal planar
(b) Pyramidal
(c) Linear
(d) Tetrahedral
Show Answer & Explanation
Correct Answer: (b) Pyramidal
Explanation:
3 bond pairs + 1 lone pair