What is the oxidation number of carbon in C₂H₂?
Let C = x. H = +1. Equation: 2x + 2(+1) = 0, 2x + 2 = 0, x = -1.
Ref: NCERT Class 11 Chemistry > Chapter 7: Redox Reactions > Topic: Classical and Electronic Concept of Redox and Oxidation Number
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The number of pi bonds in C₂H₂ is:
In C₂H₂ (ethyne), the triple bond between carbons consists of 1 sigma and 2 pi bonds, so there are 2 pi bonds total.
Ref: NCERT Class 11 Chemistry > Chapter 4: Chemical Bonding and Molecular Structure > Topic: Valence Bond Theory and Hybridisation - sp sp2 sp3 dsp2
What volume of CO₂ at STP is produced when 7 g of C₂H₂ is burned completely? (Molar mass: C₂H₂ = 26 g/mol)
Reaction: 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O. Moles of C₂H₂ = 7/26 ≈ 0.2692 mol. 2 mol C₂H₂ produce 4 mol CO₂; 0.2692 mol produce 0.5384 mol. Volume = 0.5384 × 22.4 ≈ 12.06 L.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Importance and Nature of Chemistry and Properties of Matter