NEET Chemistry 2 — Questions and Answers
Question 1: Which of the following has the highest lattice energy?
- NaCl
- MgO (Correct answer)
- CaO
- KCl
Correct answer: MgO
MgO has the highest lattice energy due to small ionic radii and high charges (2+ and 2−) of Mg²⁺ and O²⁻.
Question 2: The IUPAC name of CH₃–CH(OH)–CH₂–CHO is:
- 3-hydroxybutanal (Correct answer)
- 2-methylpropanal
- 3-hydroxy-1-butanal
- 2-hydroxybutanal
Correct answer: 3-hydroxybutanal
The parent chain is butanal with an –OH group on C-3, giving the name 3-hydroxybutanal.
Question 3: Which quantum number determines the shape of an orbital?
- Principal quantum number (n)
- Azimuthal quantum number (l) (Correct answer)
- Magnetic quantum number (m)
- Spin quantum number (s)
Correct answer: Azimuthal quantum number (l)
The azimuthal (angular momentum) quantum number l determines the shape of atomic orbitals.
Question 4: In the reaction between Na₂S₂O₃ and I₂, the equivalent weight of Na₂S₂O₃ is:
- M/2
- M/4
- M (molecular weight) (Correct answer)
- M/6
Correct answer: M (molecular weight)
In the reaction 2Na₂S₂O₃ + I₂ → Na₂S₄O₆ + 2NaI, each S changes oxidation state by 1, so n-factor = 1 and equivalent weight = M.
Question 5: Which of the following polymers is used in making bulletproof vests?
- Nylon-6,6
- Kevlar (Correct answer)
- Teflon
- Bakelite
Correct answer: Kevlar
Kevlar is an aromatic polyamide with exceptional tensile strength, used in bulletproof vests.
Question 6: The hybridization of carbon in CO₂ is:
- sp³
- sp²
- sp (Correct answer)
- dsp²
Correct answer: sp
CO₂ has two double bonds and no lone pairs on carbon, so carbon undergoes sp hybridization giving a linear geometry.
Question 7: Which of the following is an example of a lyophilic colloid?
- Gold sol
- Arsenious sulphide sol
- Starch solution (Correct answer)
- Silver sol
Correct answer: Starch solution
Starch in water is a lyophilic colloid because the dispersed phase has a strong affinity for the dispersion medium.
NEET Chemistry 2
Which of the following has the highest lattice energy?