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NEET Chemistry practice Questions– Set 5 (Final Part)

 

NEET Chemistry  – Set 5 (Final Part)

This final set (Q41–50) brings a mix of Physical, Organic, and Inorganic – all strictly NCERT-aligned. Click “Check Answer” to reveal the solution in English + Hinglish.

•Set 1.        •Set 2.     • Set 3.     • Set 4

Q41. The conjugate base of H₂SO₄ in its first ionization step is:





Correct Answer: HSO₄⁻
H₂SO₄ → H⁺ + HSO₄⁻ Hinglish: Pehla H⁺ nikalta hai → bachta HSO₄⁻.
Q42. Which has the highest lattice enthalpy?





Correct Answer: MgO
Mg²⁺ and O²⁻ → highest charge product → maximum lattice energy. Hinglish: Charge bada → attraction bada → lattice energy top.
Q43. Identify the major product of hydration of propene:





Correct Answer: Propan-2-ol
Markovnikov rule → OH goes to more substituted carbon. Hinglish: “Rich get richer” – OH doosre carbon pe lagta hai.
Q44. For the reaction: \[ \text{Rate} = k[A]^2[B] \] If [A] is doubled and [B] remains constant, rate becomes:





Correct Answer: 4 times
\[ \text{Rate} \propto [A]^2 \Rightarrow (2A)^2 = 4A^2 \] Hinglish: Square wala concept → double → 4x.
Q45. Which of the following is an electrophile?





Correct Answer: H⁺
Electrophile = electron loving → H⁺ is most electron-deficient. Hinglish: Jisko electron chahiye → vo electrophile.
Q46. The geometry of BF₃ is:





Correct Answer: Trigonal planar
B has 3 bond pairs, no lone pairs → 120° planar shape. Hinglish: BF₃ flat hota hai – teenon F ek plane mein.
Q47. Which has the highest boiling point?





Correct Answer: HF
HF shows the strongest hydrogen bonding. Hinglish: HF ke H–F bond mein hydrogen bond sabse strong.
Q48. The hybridization of carbon in HCN is:





Correct Answer: sp
HCN has linear geometry → C is sp hybridized. Hinglish: Triple bond = sp hybridization.
Q49. Which of the following is aromatic?





Correct Answer: Benzene
Benzene follows Huckel’s rule: \[ 4n+2 = 6 → n=1 \] Hinglish: Aromatic king = benzene.
Q50. Which salt solution will have pH > 7?





Correct Answer: CH₃COONa
CH₃COO⁻ is conjugate base of weak acid → basic solution. Hinglish: Acetate ion → basic → pH > 7.
NEET — Physics
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