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MODEL PAPER 1 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 11 Mark
MCQ
Which characteristic is observed by the reaction shown in the given image?
Image
  • A
    Formation of a precipitate
  • B
    Change in temperature
  • C
    Evolution of a gas
  • D
    Both change in temperature and evolution of gas
✓

Answer

Both change in temperature and evolution of gas
Explanation: Two observations are made that may suggest that a chemical reaction has taken place in the given image are
i. evolution of a gas and
ii. change in temperature.
A pop sound is produced when zinc granules and dilute sulphuric acid reacts together which shows that hydrogen gas is produced during the reaction. The flask also becomes warm showing that there is a change in temperature. Hence, the chemica reaction between zinc and dilute sulphuric acid is characterized by the evolution of hydrogen gas and change in temperature.
$Zn + H _2 SO _4 \rightarrow ZnSO _4+ H _2$↑ + Heat

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