NEET Practice: Chemistry 1

1. The number of moles in 18 g of water is:

(a) 1 mole (b) 2 moles (c) 0.5 mole (d) 18 moles

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Correct Answer: (a) 1 mole

Explanation:
Molar mass of H₂O = 18 g/mol → 18 g = 1 mole

2. The oxidation state of Cr in K₂Cr₂O₇ is:

(a) +6 (b) +3 (c) +7 (d) +4

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Correct Answer: (a) +6

Explanation:
2(+1) + 2x + 7(-2) = 0 → 2x = 12 → x = +6

3. The pH of 0.01 M HCl solution is:

(a) 1 (b) 2 (c) 3 (d) 7

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Correct Answer: (b) 2

Explanation:
[H⁺] = 0.01 M → pH = -log(0.01) = 2

4. The hybridisation of carbon in CH₄ is:

(a) sp (b) sp² (c) sp³ (d) sp³d

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Correct Answer: (c) sp³

Explanation:
Tetrahedral geometry → sp³ hybridisation

5. The IUPAC name of CH₃CH₂CH₂OH is:

(a) Propanal (b) Propanol (c) Propanoic acid (d) Propan-1-ol

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Correct Answer: (d) Propan-1-ol

Explanation:
Longest chain with -OH group at position 1

6. The number of sigma and pi bonds in C₂H₂ is:

(a) 3 sigma, 2 pi (b) 2 sigma, 3 pi (c) 5 sigma, 0 pi (d) 2 sigma, 2 pi

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Correct Answer: (a) 3 sigma, 2 pi

Explanation:
H-C≡C-H → 3 σ bonds, 2 π bonds

7. The molarity of 98% H₂SO₄ (density 1.84 g/mL) is approximately:

(a) 18 M (b) 9.8 M (c) 36 M (d) 1.84 M

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Correct Answer: (a) 18 M

Explanation:
M = (98 × 1000 × 1.84) / (98 × 100) ≈ 18 M

8. The element with electronic configuration [Ar] 4s² 3d¹⁰ is:

(a) Zn (b) Cu (c) Ni (d) Fe

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Correct Answer: (a) Zn

Explanation:
Zinc has completely filled 3d¹⁰ and 4s²

9. The functional group present in carboxylic acid is:

(a) -CHO (b) -COOH (c) -OH (d) -NH₂

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Correct Answer: (b) -COOH

Explanation:
Carboxyl group (-COOH)

10. The number of lone pairs on the central atom in XeF₄ is:

(a) 0 (b) 1 (c) 2 (d) 3

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Correct Answer: (c) 2

Explanation:
XeF₄ has 2 lone pairs (square planar)