The p-Block Elements for NEET UG
The p-block has the widest variety in the periodic table: metals, metalloids, non-metals and noble gases. Focus on the trends in groups 15–18 and the structures of their key compounds.
ChemistryClass 1273 MCQs2 lessons14 flashcards7 memory tricks
Practise The p-Block Elements free
What you'll learn
- Group 15 and 16: nitrogen, phosphorus, oxygen, sulphur
Explain trends in groups 15 and 16 and recall the preparation and uses of key compounds. - Group 17 and 18: halogens and noble gases
Explain the reactivity of halogens, the anomalies of fluorine, and the compounds of xenon.
Memory tricks
B, Al, Ga, In, Tl.
C, Si, Ge, Sn, Pb.
N, P, As, Sb, Bi.
O, S, Se, Te, Po.
F, Cl, Br, I, At.
He, Ne, Ar, Kr, Xe, Rn.
Down groups 13–15 the lower oxidation state becomes more stable: Tl⁺ over Tl³⁺, Pb²⁺ over Pb⁴⁺, Bi³⁺ over Bi⁵⁺.
Try 3 NEET-style questions
Q1. Which of the following is an interhalogen compound?
- XeF₆
- SF₆
- IF₇
- PCl₅
Show answer
Answer: (3) IF₇
Interhalogen compounds contain two different halogens. IF₇ contains iodine and fluorine.
Q2. Carbon monoxide is highly poisonous mainly because it
- binds to haemoglobin much more strongly than oxygen does
- is a strongly acidic oxide that burns the lungs
- reacts with water in the blood to form carbonic acid
- is a heavy gas that settles in the lungs
Show answer
Answer: (1) binds to haemoglobin much more strongly than oxygen does
CO forms a stable complex, carboxyhaemoglobin, about 200–300 times more stable than oxyhaemoglobin. This blocks oxygen transport.
Q3. Among the group 16 hydrides below, which has the highest boiling point?
- H₂S
- H₂Se
- H₂O
- H₂Te
Show answer
Answer: (3) H₂O
Water forms extensive intermolecular hydrogen bonds, so it boils far higher (373 K) than the other group 16 hydrides.
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