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MODEL PAPER - 1 [2026] — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER - 1 [2026]1 Mark
MCQ
Which of the given statement is correct or wrong:
Statement A: Oxyacetylene flame is used for welding purposes.
Statement B: Ethyne reacts with HCl in the presence of $\mathrm{HgCl}_{2}$ to form vinyl chloride.
  • A
    Neither statement $A$ nor statement $B$ is true.
  • ✓
    Both the statements A and B are true.
  • C
    Statement B is true; Statement A is false.
  • D
    Statement A is true; Statement B is false.
✓

Answer

Correct option: B.
Both the statements A and B are true.
(B) Both the statements A and B are true.
Explanation:
- The oxyacetylene flame is used for welding purposes. The oxyacetylene welding process uses a combination of oxygen and acetylene ( $\mathrm{C}_{2} \mathrm{H}_{2}$ ) gas to provide a high-temperature flame. It is commonly used to join mild steel permanently.
- Ethyne $\left(\mathrm{C}_{2} \mathrm{H}_{2}\right)$ reacts with HCl in the presence of $\mathrm{HgCl}_{2}$ to from vinyl chloride or chloroethane $\mathrm{H}_{2} \mathrm{C}=\mathrm{CHCl}$. This colourless compound is an important industrial chemical. It is chiefly used to produce polyvinyl chloride (PVC).

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