NEET Chemistry Previous Year Questions (PYQ-Style) — With Solutions
A set of NEET-level Chemistry questions in the style of previous-year papers, spanning physical, organic and inorganic chemistry, with answer keys and worked solutions. Attempt each question first, then reveal the solution to check your reasoning.
The number of moles present in 22 g of carbon dioxide (molar mass = 44 g/mol) is:
- A.0.25 mol
- B.0.5 mol
- C.1 mol
- D.2 mol
The number of molecules present in 0.5 mole of water is (Avogadro's number = 6.022 × 10²³):
- A.3.011 × 10²²
- B.3.011 × 10²³
- C.6.022 × 10²³
- D.1.2 × 10²⁴
The maximum number of electrons that can be accommodated in the M shell (n = 3) of an atom is:
- A.2
- B.8
- C.18
- D.32
The number of orbitals present in the d subshell is:
- A.1
- B.3
- C.5
- D.7
Solution locked
Unlock all solutions — freeAt constant temperature, if the pressure exerted on a fixed mass of an ideal gas is doubled, its volume becomes:
- A.doubled
- B.halved
- C.unchanged
- D.quadrupled
Solution locked
Unlock all solutions — freeThe volume occupied by 1 mole of an ideal gas at STP (273 K, 1 atm) is:
- A.11.2 L
- B.22.4 L
- C.24 L
- D.44.8 L
Solution locked
Unlock all solutions — freeFor an exothermic reaction, the sign of the enthalpy change (ΔH) is:
- A.positive
- B.negative
- C.zero
- D.always undefined
Solution locked
Unlock all solutions — freeFor the equilibrium N₂(g) + 3H₂(g) ⇌ 2NH₃(g), decreasing the volume (increasing the pressure) shifts the equilibrium:
- A.forward, toward NH₃
- B.backward, toward N₂ and H₂
- C.no shift occurs
- D.the reaction stops
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Unlock all solutions — freeThe pH of a 0.001 M aqueous solution of HCl is:
- A.1
- B.2
- C.3
- D.11
Solution locked
Unlock all solutions — freeFor a first-order reaction, the half-life is:
- A.directly proportional to the initial concentration
- B.independent of the initial concentration
- C.inversely proportional to the rate constant squared
- D.always equal to zero
Solution locked
Unlock all solutions — freeThe general molecular formula of an open-chain saturated alkane is:
- A.CₙH₂ₙ₊₂
- B.CₙH₂ₙ
- C.CₙH₂ₙ₋₂
- D.CₙHₙ
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Unlock all solutions — freeThe total number of sigma (σ) bonds present in a molecule of ethane (C₂H₆) is:
- A.6
- B.7
- C.8
- D.1
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Unlock all solutions — freeThe hybridisation of each carbon atom in ethyne (acetylene, C₂H₂) is:
- A.sp
- B.sp²
- C.sp³
- D.sp³d
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Unlock all solutions — freeThe functional group present in ethanol (C₂H₅OH) is the:
- A.hydroxyl (−OH) group
- B.aldehyde (−CHO) group
- C.carboxyl (−COOH) group
- D.keto (>C=O) group
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Unlock all solutions — freeThe number of structural (chain) isomers of butane, C₄H₁₀, is:
- A.1
- B.2
- C.3
- D.4
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Unlock all solutions — freeThe type of isomerism exhibited by but-2-ene (CH₃–CH=CH–CH₃) is:
- A.geometrical (cis–trans)
- B.optical
- C.chain
- D.positional
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Unlock all solutions — freeWhich of the following carbocations is the most stable?
- A.methyl carbocation
- B.primary carbocation
- C.secondary carbocation
- D.tertiary carbocation
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Unlock all solutions — freeThe products of the complete combustion of methane (CH₄) in excess oxygen are:
- A.CO + H₂O
- B.CO₂ + H₂O
- C.C + H₂O
- D.CO₂ + H₂
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Unlock all solutions — freeAn element with atomic number 17 belongs to which group of the periodic table?
- A.Group 1
- B.Group 15
- C.Group 16
- D.Group 17
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Unlock all solutions — freeThe most electronegative element in the periodic table is:
- A.oxygen
- B.nitrogen
- C.chlorine
- D.fluorine
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Unlock all solutions — freeAs we move down a group in the periodic table, the atomic radius of the elements generally:
- A.increases
- B.decreases
- C.remains the same
- D.first increases then decreases
Solution locked
Unlock all solutions — freeThe oxidation state of manganese in potassium permanganate (KMnO₄) is:
- A.+2
- B.+4
- C.+6
- D.+7
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Unlock all solutions — freeThe shape of the ammonia (NH₃) molecule is:
- A.tetrahedral
- B.trigonal pyramidal
- C.trigonal planar
- D.linear
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Unlock all solutions — freeWhich of the following is a noble (inert) gas?
- A.nitrogen
- B.oxygen
- C.argon
- D.hydrogen
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Unlock all solutions — freeThe number of unpaired electrons in a ground-state nitrogen atom (Z = 7) is:
- A.0
- B.1
- C.2
- D.3
Solution locked
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