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MODEL PAPER 8 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 81 Mark
MCQ
Choose a displacement reaction:
  • A
    Burning of metals
  • B
    Addition of more active metal to a solution of a less active metal compound
  • C
    Extraction of metals
  • D
    Electrolysis
✓

Answer

(b) Addition of more active metal to a solution of a less active metal compound
Explanation: Reactions in which atoms or ions move from one compound to others to form a new compound are known as
Displacement reactions.
A general displacement reaction can be represented using a chemical equation as follows:
$A + BC \rightarrow AC + B$
Displacement reaction takes place only when ‘A’ is more reactive than B. If ‘B’ is more reactive than ‘A’, then ‘A’ will not
displace ‘C’ from ‘BC’ and reaction will not be taken place.
Example: When zinc reacts with hydrochloric acid, it gives hydrogen gas and zinc chloride.

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