The s-Block Elements NEET PYQs (1988–2026)

Solved The s-Block Elements PYQs

3 recent questions with answers. The full set of 70 is free to practise.

1. NEET 2026HardCompounds of S-Block
   Q1

   In potash alum, the ratio of K⁺ and SO₄²^- ions is:

   • A1:2
   • B2:1
   • C2:3
   • D3:2

   Show answer & solution

   Correct answer: (A)

   Potash alum: K₂SO₄·Al₂(SO₄)₃·24H₂O. Number of K⁺ = 2, SO₄²^- = 1+3 = 4.
   
   Ratio = 2:4 = 1:2.
2. NEET 2025Easy
   Q2

   Which one of the following reactions does NOT belong to "Lassaigne's test"?

   • A$Na+X\underset{\Delta }{⟶}+NaX$
   • B$2CuO+C\underset{\Delta }{⟶}2Cu+{CO}_2$
   • C$Na+C+N\underset{\Delta }{⟶}NaCN$
   • D$2Na+S\underset{\Delta }{⟶}{Na}_{2}S$

   Show answer & solution

   Correct answer: (B)

   Nitrogen, sulphur, halogens and phosphorus present in an organic compound are detected by "Lassaigne's test".
   
   $$\begin{array}{cc}& Na+C+N\to NaCN\\ & 2Na+S\to {Na}_{2}S\\ & Na+X\to \underset{(X=Cl,Br,l)}{\mathrm{NaX}}\end{array}$$
3. NEET 2023MediumBiological Importance
   Q3

   Which one of the following statements is correct?
   
   [NEET 2023]

   • AAll enzymes that utilise ATP in phosphate transfer require Ca as the cofactor
   • BThe bone in human body is an inert and unchanging substance
   • CMg plays roles in neuromuscular function and interneuronal transmission
   • DThe daily requirement of Mg and Ca in the human body is estimated to be $0.2-0.3g$

   Show answer & solution

   Correct answer: (D)

   All enzymes that utilize ATP in phosphate transfer require Mg as the co-factor.
   Bone in human body is not an inert and unchanging substance but is continuously being solubilised and redeposited.
   Ca plays important role in neuromuscular function, interneuronal transmission, cell membrane integrity and blood coagulation.
   
   The daily requirement of Mg and Ca in the human body is estimated to be $200-300mg$ ( $0.2-0.3g$ )

Topic-wise question count

Where NEET has asked from The s-Block Elements, most frequent first.

• Compounds of S-Block43
• Properties of S-Block Elements9
• Uses of S-Block Elements8
• Atomic and Ionic Radii2
• Biological Importance1
• Alkali Metals Properties1
• Diagonal Relationship1
• Oxidation States1
• Ionization Enthalpy1
• Lattice Energy1
• Electronic Configuration1

Year-wise The s-Block Elements questions in NEET

Number of questions from this chapter in each year's paper(s).