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NEET Practice: Chemistry 3
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1.
The atomic number of an element with electronic configuration 1s² 2s² 2p⁶ 3s² is:
(a) 10
(b) 11
(c) 12
(d) 13
Show Answer & Explanation
Correct Answer: (c) 12
Explanation:
Total electrons = 12 → Magnesium (Z=12)
2.
The number of moles of NaOH in 40 g is:
(a) 1 mole
(b) 0.5 mole
(c) 2 moles
(d) 0.1 mole
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Correct Answer: (a) 1 mole
Explanation:
Molar mass of NaOH = 40 g/mol → 40 g = 1 mole
3.
The pOH of 0.001 M NaOH solution is:
(a) 3
(b) 11
(c) 7
(d) 10
Show Answer & Explanation
Correct Answer:
(a) 3
Explanation:
[OH⁻] = 0.001 M = 10⁻³ M, so pOH = –log(10⁻³) = 3.
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 CH₃CH₂CHO is:
(a) Propanal
(b) Propanone
(c) Propanoic acid
(d) Propan-1-ol
Show Answer & Explanation
Correct Answer: (a) Propanal
Explanation:
Aldehyde with 3 carbons
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 PCl₅ molecule is:
(a) Trigonal bipyramidal
(b) Tetrahedral
(c) Octahedral
(d) Square planar
Show Answer & Explanation
Correct Answer: (a) Trigonal bipyramidal
Explanation:
5 bond pairs, no lone pair