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NEET Practice: Chemistry 4
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1.
The number of atoms in 0.1 mole of oxygen gas (O₂) is:
(a) 6.022 × 10²²
(b) 1.204 × 10²³
(c) 3.011 × 10²²
(d) 6.022 × 10²³
Show Answer & Explanation
Correct Answer: (b) 1.204 × 10²³
Explanation:
0.1 mole O₂ = 0.2 mole atoms → 0.2 × 6.022 × 10²³
2.
The oxidation number of sulphur in H₂SO₄ is:
(a) +2
(b) +4
(c) +6
(d) +8
Show Answer & Explanation
Correct Answer: (c) +6
Explanation:
2(+1) + x + 4(-2) = 0 → x = +6
3.
The pH of 0.0001 M HCl is:
(a) 4
(b) 3
(c) 2
(d) 1
Show Answer & Explanation
Correct Answer: (a) 4
Explanation:
[H⁺] = 10⁻⁴ M → pH = 4
4.
The hybridisation of carbon in CO₂ is:
(a) sp
(b) sp²
(c) sp³
(d) sp³d
Show Answer & Explanation
Correct Answer: (a) sp
Explanation:
Linear geometry → sp hybridisation
5.
The IUPAC name of CH₃COOH is:
(a) Methanoic acid
(b) Ethanoic acid
(c) Propanoic acid
(d) Butanoic acid
Show Answer & Explanation
Correct Answer: (b) Ethanoic acid
Explanation:
Two-carbon carboxylic acid
6.
The number of sigma bonds in benzene (C₆H₆) is:
(a) 6
(b) 12
(c) 18
(d) 9
Show Answer & Explanation
Correct Answer: (b) 12
Explanation:
6 C-H + 6 C-C sigma bonds
7.
The molarity of 36.5 g HCl in 1 litre solution is:
(a) 1 M
(b) 0.5 M
(c) 2 M
(d) 36.5 M
Show Answer & Explanation
Correct Answer: (a) 1 M
Explanation:
Molar mass HCl = 36.5 g/mol → 1 mole in 1 L = 1 M
8.
The element with highest electronegativity is:
(a) Fluorine
(b) Oxygen
(c) Chlorine
(d) Nitrogen
Show Answer & Explanation
Correct Answer: (a) Fluorine
Explanation:
Fluorine has the highest electronegativity (4.0)
9.
The functional group in ketones is:
(a) -CHO
(b) -CO-
(c) -COOH
(d) -OH
Show Answer & Explanation
Correct Answer: (b) -CO-
Explanation:
Ketone group is carbonyl between two carbon atoms
10.
The shape of XeF₂ molecule is:
(a) Linear
(b) Bent
(c) Trigonal planar
(d) T-shaped
Show Answer & Explanation
Correct Answer: (a) Linear
Explanation:
2 bond pairs + 3 lone pairs → linear