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NEET Practice: Chemistry 2
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1.
The molar mass of Na₂CO₃ is:
(a) 106 g/mol
(b) 100 g/mol
(c) 84 g/mol
(d) 120 g/mol
Show Answer & Explanation
Correct Answer: (a) 106 g/mol
Explanation:
2×23 + 12 + 3×16 = 106 g/mol
2.
The number of electrons in 1 mole of CH₄ is:
(a) 6.022 × 10²³
(b) 6 × 6.022 × 10²³
(c) 10 × 6.022 × 10²³
(d) 8 × 6.022 × 10²³
Show Answer & Explanation
Correct Answer: (c) 10 × 6.022 × 10²³
Explanation:
One CH₄ molecule has 10 electrons → 10 × N_A
3.
The pH of 0.001 M NaOH 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 nitrogen in NH₃ is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d
Show Answer & Explanation
Correct Answer: (c) sp³
Explanation:
Trigonal pyramidal with one lone pair → sp³
5.
The IUPAC name of CH₃COCH₃ is:
(a) Propanal
(b) Propanone
(c) Propanoic acid
(d) Propan-2-ol
Show Answer & Explanation
Correct Answer: (b) Propanone
Explanation:
Ketone with 3 carbons
6.
The number of sigma and pi bonds in C₂H₄ is:
(a) 5 sigma, 1 pi
(b) 4 sigma, 2 pi
(c) 5 sigma, 2 pi
(d) 6 sigma, 0 pi
Show Answer & Explanation
Correct Answer: (a) 5 sigma, 1 pi
Explanation:
H₂C=CH₂ → 5 σ bonds, 1 π bond
7.
The normality of 0.5 M H₂SO₄ solution is:
(a) 0.5 N
(b) 1 N
(c) 2 N
(d) 0.25 N
Show Answer & Explanation
Correct Answer: (b) 1 N
Explanation:
Normality = Molarity × basicity = 0.5 × 2 = 1 N
8.
The electronic configuration of Cu (Z=29) is:
(a) [Ar] 4s² 3d⁹
(b) [Ar] 4s¹ 3d¹⁰
(c) [Ar] 4s² 3d¹⁰
(d) [Ar] 3d¹⁰ 4s¹
Show Answer & Explanation
Correct Answer: (b) [Ar] 4s¹ 3d¹⁰
Explanation:
Copper has exceptional configuration for stability
9.
The functional group in aldehydes is:
(a) -COOH
(b) -CHO
(c) -OH
(d) -NH₂
Show Answer & Explanation
Correct Answer: (b) -CHO
Explanation:
Aldehyde group is -CHO
10.
The shape of SF₄ molecule is:
(a) Tetrahedral
(b) See-saw
(c) Trigonal bipyramidal
(d) Square planar
Show Answer & Explanation
Correct Answer: (b) See-saw
Explanation:
SF₄ has 4 bond pairs + 1 lone pair → see-saw shape