p-Block Elements NEET Previous Year Questions (PYQs)
Practice NEET previous year questions from p-Block Elements (Group 13–18). These MCQs cover boron family, carbon family, nitrogen, oxygen, halogens and noble gases with answers and clear explanations strictly based on NCERT.
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p-Block Elements Chapter Notes
Q1. Which one of the following elements is unable to form BF6− ion?
(NEET 2018)
- (A) Al
- (B) Ga
- (C) In
- (D) B
Show Answer
(D)
Show Explanation
Boron does not have vacant d-orbitals and cannot expand its octet.
Q2. Boric acid is acidic because it:
(NEET 2016)
- (A) contains replaceable H+
- (B) donates a proton
- (C) accepts OH− from water
- (D) combines with H+
Show Answer
(C)
Show Explanation
Boric acid acts as a Lewis acid by accepting OH− ion from water.
Q3. The stability of +1 oxidation state among Al, Ga, In and Tl increases in the order:
(NEET 2015)
- (A) Al < Ga < In < Tl
- (B) Tl < In < Ga < Al
- (C) Ga < Al < In < Tl
- (D) In < Tl < Ga < Al
Show Answer
(A)
Show Explanation
Inert pair effect increases down the group, stabilising +1 oxidation state.
Q4. Which compound has a structure similar to graphite?
(NEET 2013)
- (A) SiC
- (B) AlN
- (C) BN
- (D) B2O3
Show Answer
(C)
Show Explanation
BN is known as inorganic graphite and has layered structure.
Q5. The basic structural unit of silicates is:
(NEET 2013)
- (A) SiO2
- (B) SiO44−
- (C) Si2O76−
- (D) SiO32−
Show Answer
(B)
Show Explanation
All silicates are built from SiO44− tetrahedra.
Q6. Which oxide is amphoteric?
(NEET 2011)
- (A) Al2O3
- (B) CO2
- (C) SO3
- (D) Na2O
Show Answer
(A)
Show Explanation
Al2O3 reacts with both acids and bases.
Q7. Which hydride acts as a Lewis acid?
(NEET 2010)
- (A) NH3
- (B) CH4
- (C) BH3
- (D) H2O
Show Answer
(C)
Show Explanation
BH3 is electron deficient and accepts electron pairs.
Q8. Which halogen has the highest electron gain enthalpy?
(NEET 2018)
- (A) F
- (B) Cl
- (C) Br
- (D) I
Show Answer
(B)
Show Explanation
Chlorine has maximum electron gain enthalpy due to optimal size.
Q9. Strong reducing behaviour of H3PO2 is due to:
(NEET 2015)
- (A) two P–OH bonds
- (B) two P–H bonds
- (C) high oxidation state
- (D) resonance
Show Answer
(B)
Show Explanation
Presence of P–H bonds makes it a strong reducing agent.
Q10. The high boiling point of HF compared to other hydrogen halides is due to:
(NEET 2015)
- (A) high bond energy
- (B) hydrogen bonding
- (C) higher molar mass
- (D) van der Waals forces
Show Answer
(B)
Show Explanation
Strong intermolecular hydrogen bonding exists in HF.
Q11. Which nitrogen oxide is paramagnetic?
(NEET 1994)
- (A) N2O
- (B) NO
- (C) N2O5
- (D) NO2
Show Answer
(D)
Show Explanation
NO2 contains one unpaired electron.
Q12. Which of the following does NOT give oxygen on heating?
(NEET 2013)
- (A) KClO3
- (B) KMnO4
- (C) NaNO3
- (D) NaClO4
Show Answer
(D)
Show Explanation
NaClO4 is very stable and does not decompose easily.
Q13. Which allotrope of phosphorus is most reactive?
(NEET 1999)
- (A) Red
- (B) White
- (C) Black
- (D) Violet
Show Answer
(B)
Show Explanation
White phosphorus has low ignition temperature.
Q14. Bleaching action of chlorine is due to:
(NEET 1991)
- (A) reduction
- (B) oxidation
- (C) chlorination
- (D) hydrolysis
Show Answer
(B)
Show Explanation
Chlorine oxidises colouring matter in presence of moisture.
Q15. Which noble gas forms the maximum number of compounds?
(NEET 2019)
- (A) He
- (B) Ne
- (C) Ar
- (D) Xe
Show Answer
(D)
Show Explanation
Xenon has comparatively lower ionisation energy.
Q16. Which molecule has square planar geometry?
(NEET 2019)
- (A) XeF2
- (B) XeF4
- (C) XeF6
- (D) XeO3
Show Answer
(B)
Show Explanation
XeF4 has sp3d2 hybridisation with two lone pairs.
Q17. Which hydride shows strongest hydrogen bonding?
(NEET 1992)
- (A) NH3
- (B) H2O
- (C) HF
- (D) H2S
Show Answer
(C)
Show Explanation
HF has highest electronegativity difference.
Q18. Which gas is absorbed by alkaline pyrogallol?
(NEET 1991)
- (A) CO2
- (B) O2
- (C) N2
- (D) H2
Show Answer
(B)
Show Explanation
Alkaline pyrogallol absorbs oxygen.
Q19. Which element readily forms anions?
(NEET 1992)
- (A) Alkali metals
- (B) Alkaline earth metals
- (C) Halogens
- (D) Noble gases
Show Answer
(C)
Show Explanation
Halogens have high electron affinity.
Q20. Which compound is electron deficient?
(NEET 2000)
- (A) NH3
- (B) BF3
- (C) CH4
- (D) H2O
Show Answer
(B)
Show Explanation
BF3 has only six electrons in valence shell of boron.
👉 More p-Block Elements NEET PYQs will be added gradually.