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Chemistry MCQ Practice 10 — Science Foundation Course for Class 11 & 12
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1.
The number of moles in 25.5 g of NH₃ is:
(a) 1.5 mole
(b) 0.5 mole
(c) 1 mole
(d) 2.5 mole
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Correct Answer: (a) 1.5 mole
Explanation:
Molar mass NH₃ = 17 g/mol → 25.5 / 17 = 1.5 mole
2.
The oxidation state of phosphorus in H₃PO₄ is:
(a) +3
(b) +5
(c) +1
(d) +7
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Correct Answer: (b) +5
Explanation:
3(+1) + x + 4(-2) = 0 → x = +5
3.
The pH of 0.001 M KOH solution is:
(a) 3
(b) 11
(c) 7
(d) 10
Show Answer & Explanation
Correct Answer: (b) 11
Explanation:
[OH⁻] = 0.001 M → pOH = 3 → pH = 11
4.
The hybridisation of oxygen in water (H₂O) is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d
Show Answer & Explanation
Correct Answer: (c) sp³
Explanation:
Bent shape with 2 lone pairs → sp³
5.
The IUPAC name of CH₃CH₂COCH₃ is:
(a) Butanone
(b) Butanal
(c) Pentanone
(d) Propanone
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Correct Answer: (a) Butanone
Explanation:
Four-carbon ketone (methyl ethyl ketone)
6.
The number of sigma and pi bonds in CH₃-C≡N is:
(a) 5 sigma, 2 pi
(b) 6 sigma, 2 pi
(c) 4 sigma, 3 pi
(d) 7 sigma, 1 pi
Show Answer & Explanation
Correct Answer: (a) 5 sigma, 2 pi
Explanation:
CH₃-C≡N → 5 σ bonds, 2 π bonds
7.
The molarity of 49 g H₂SO₄ in 2 litre solution is:
(a) 0.25 M
(b) 0.5 M
(c) 1 M
(d) 0.1 M
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Correct Answer: (a) 0.25 M
Explanation:
Moles = 49 / 98 = 0.5, Volume = 2 L → M = 0.25
8.
The element with electronic configuration [Kr] 5s² 4d¹⁰ 5p⁶ is:
(a) Xenon
(b) Krypton
(c) Radon
(d) Iodine
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Correct Answer: (a) Xenon
Explanation:
Atomic number 54 → Xenon
9.
The functional group in acid chlorides is:
(a) -COCl
(b) -COOH
(c) -CONH₂
(d) -CHO
Show Answer & Explanation
Correct Answer: (a) -COCl
Explanation:
Acid chloride group is -COCl
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