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NEET Practice: Chemistry 5
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1.
The number of moles of CO₂ in 22 g is:
(a) 0.5 mole
(b) 1 mole
(c) 2 moles
(d) 0.25 mole
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Correct Answer: (a) 0.5 mole
Explanation:
Molar mass CO₂ = 44 g/mol → 22 g = 0.5 mole
2.
The oxidation state of Mn in KMnO₄ is:
(a) +5
(b) +6
(c) +7
(d) +4
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Correct Answer: (c) +7
Explanation:
+1 + x + 4(-2) = 0 → x = +7
3.
The pH of a solution with [H⁺] = 10⁻⁸ M is approximately:
(a) 8
(b) 7
(c) 6
(d) 8.0 (considering water contribution)
Show Answer & Explanation
Correct Answer: (d) 8.0 (considering water contribution)
Explanation:
Very dilute solution, actual pH ≈ 6.98
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 CH₃CH₂COOH is:
(a) Propanoic acid
(b) Ethanoic acid
(c) Butanoic acid
(d) Methanoic acid
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Correct Answer: (a) Propanoic acid
Explanation:
Three-carbon carboxylic acid
6.
The number of sigma and pi bonds in propyne (C₃H₄) is:
(a) 6 sigma, 2 pi
(b) 5 sigma, 2 pi
(c) 7 sigma, 1 pi
(d) 8 sigma, 0 pi
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Correct Answer: (a) 6 sigma, 2 pi
Explanation:
H₃C-C≡CH → 6 σ, 2 π
7.
The normality of 0.1 M H₃PO₄ is:
(a) 0.1 N
(b) 0.3 N
(c) 0.2 N
(d) 0.4 N
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Correct Answer: (b) 0.3 N
Explanation:
Normality = M × basicity = 0.1 × 3 = 0.3 N
8.
The element with electronic configuration [Ar] 3d⁵ 4s¹ is:
(a) Cr
(b) Mn
(c) Fe
(d) Co
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Correct Answer: (a) Cr
Explanation:
Chromium has half-filled d subshell stability
9.
The functional group in amines is:
(a) -NH₂
(b) -OH
(c) -COOH
(d) -CHO
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Correct Answer: (a) -NH₂
Explanation:
Amine functional group is -NH₂
10.
The shape of SF₆ molecule is:
(a) Trigonal bipyramidal
(b) Octahedral
(c) Square planar
(d) T-shaped
Show Answer & Explanation
Correct Answer: (b) Octahedral
Explanation:
6 bond pairs, no lone pair