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Chemistry MCQ Practice 7 — Science Foundation Course for Class 11 & 12
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1.
The number of moles in 9.8 g of H₂SO₄ is:
(a) 0.1 mole
(b) 0.2 mole
(c) 1 mole
(d) 0.05 mole
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Correct Answer: (a) 0.1 mole
Explanation:
Molar mass H₂SO₄ = 98 g/mol → 9.8 g = 0.1 mole
2.
The oxidation state of Cl in HClO₄ is:
(a) +5
(b) +7
(c) +3
(d) +1
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Correct Answer: (b) +7
Explanation:
+1 + x + 4(-2) = 0 → x = +7
3.
The pH of a solution with [OH⁻] = 10⁻¹² M is:
(a) 2
(b) 12
(c) 7
(d) 10
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Correct Answer: (a) 2
Explanation:
pOH = 12 → pH = 14 - 12 = 2
4.
The hybridisation of carbon in acetylene (C₂H₂) is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d
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Correct Answer: (a) sp
Explanation:
Linear geometry with triple bond → sp
5.
The IUPAC name of CH₃CH₂CH₂CH₂OH is:
(a) Butanol
(b) Butan-1-ol
(c) Butan-2-ol
(d) Pentanol
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Correct Answer: (b) Butan-1-ol
Explanation:
Four-carbon primary alcohol
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 [Ar] 3d⁶ 4s ² is:
(a) Fe
(b) Co
(c) Ni
(d) Mn
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Correct Answer: (a) Fe
Explanation:
Atomic number 26 → Iron
9.
The functional group in amides is:
(a) -COOH
(b) -CONH₂
(c) -NH₂
(d) -CHO
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Correct Answer: (b) -CONH₂
Explanation:
Amide functional group is -CONH₂
10.
The shape of ClF₃ molecule is:
(a) Trigonal bipyramidal
(b) T-shaped
(c) Linear
(d) Octahedral
Show Answer & Explanation
Correct Answer: (b) T-shaped
Explanation:
3 bond pairs + 2 lone pairs → T-shaped