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Chemistry MCQ Practice 11 — Science Foundation Course for Class 11 & 12
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1.
The number of moles in 12.8 g of SO₂ is:
(a) 0.2 mole
(b) 0.5 mole
(c) 1 mole
(d) 0.1 mole
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Correct Answer: (a) 0.2 mole
Explanation:
Molar mass SO₂ = 64 g/mol → 12.8 / 64 = 0.2 mole
2.
The oxidation state of nitrogen in NH₄⁺ is:
(a) -3
(b) +3
(c) -1
(d) +5
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Correct Answer: (a) -3
Explanation:
x + 4(+1) = +1 → x = -3
3.
The pH of 0.001 M acetic acid (Ka = 1.8×10⁻⁵) is approximately:
(a) 3.37
(b) 4.74
(c) 2.87
(d) 5.0
Show Answer & Explanation
Correct Answer: (a) 3.37
Explanation:
[H⁺] ≈ √(Ka × C) = √(1.8×10⁻⁷) ≈ 4.24×10⁻⁴ → pH ≈ 3.37
4.
The hybridisation of phosphorus in PCl₅ is:
(a) sp³
(b) sp³d
(c) sp³d²
(d) sp²
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Correct Answer: (b) sp³d
Explanation:
Trigonal bipyramidal geometry
5.
The IUPAC name of CH₃CH₂CH₂CH₂CH₂OH is:
(a) Pentan-1-ol
(b) Hexan-1-ol
(c) Butan-1-ol
(d) Hexanol
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Correct Answer: (a) Pentan-1-ol
Explanation:
Five-carbon primary alcohol
6.
The number of sigma and pi bonds in CH₃-CH=CH₂ is:
(a) 8 sigma, 1 pi
(b) 7 sigma, 1 pi
(c) 9 sigma, 0 pi
(d) 6 sigma, 2 pi
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Correct Answer: (a) 8 sigma, 1 pi
Explanation:
Propene has 8 σ bonds and 1 π bond
7.
The molarity of 4 g NaOH in 250 mL solution is:
(a) 0.4 M
(b) 0.1 M
(c) 0.2 M
(d) 1 M
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Correct Answer: (a) 0.4 M
Explanation:
Moles = 4 / 40 = 0.1, Volume = 0.25 L → M = 0.4
8.
The element with electronic configuration [Ar] 3d¹⁰ 4s² is:
(a) Cu
(b) Zn
(c) Ni
(d) Fe
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Correct Answer: (b) Zn
Explanation:
Zinc (Z=30)
9.
The functional group in nitro compounds is:
(a) -NO₂
(b) -NH₂
(c) -CN
(d) -CONH₂
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Correct Answer: (a) -NO₂
Explanation:
Nitro group (-NO₂)
10.
The shape of ICl₄⁻ ion is:
(a) Tetrahedral
(b) Square planar
(c) Octahedral
(d) Trigonal bipyramidal
Show Answer & Explanation
Correct Answer: (b) Square planar
Explanation:
4 bond pairs + 2 lone pairs