Chemistry Flashcards
7 cards from real NEET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Chemistry flashcards as text
Which of the following has the highest lattice energy?
Answer: MgO
MgO has the highest lattice energy due to small ionic radii and high charges (2+ and 2−) of Mg²⁺ and O²⁻.
The IUPAC name of CH₃–CH(OH)–CH₂–CHO is:
Answer: 3-hydroxybutanal
The parent chain is butanal with an –OH group on C-3, giving the name 3-hydroxybutanal.
Which quantum number determines the shape of an orbital?
Answer: Azimuthal quantum number (l)
The azimuthal (angular momentum) quantum number l determines the shape of atomic orbitals.
In the reaction between Na₂S₂O₃ and I₂, the equivalent weight of Na₂S₂O₃ is:
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.
Which of the following polymers is used in making bulletproof vests?
Answer: Kevlar
Kevlar is an aromatic polyamide with exceptional tensile strength, used in bulletproof vests.
The hybridization of carbon in CO₂ is:
Answer: sp
CO₂ has two double bonds and no lone pairs on carbon, so carbon undergoes sp hybridization giving a linear geometry.
Which of the following is an example of a lyophilic colloid?
Answer: Starch solution
Starch in water is a lyophilic colloid because the dispersed phase has a strong affinity for the dispersion medium.
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