Types of Chemical Reactions — Science STD 10 — Question
Tamilnadu BoardEnglish MediumSTD 10ScienceTypes of Chemical Reactions2 Marks
Question
Suggest a reason for each observation given below.
✓
Answer
(i) In fireworks, powdered Mg is used rather than Mg ribbon.
Powdered Mg will have larger surface area than Mg ribbon and the rate of the reaction increases.
(ii) Zn and dil. $H _2 SO _4$ react much more quickly when a few drops of $CuSO _4$ solution are added.
When few drops of $CuSO _4$ are added to the solution containing Zn and dil. $H _2 SO _4$, the rate of the reaction increases, because CuSO $C _4$ acts as catalyst.
(iii) The reaction between $MgCO _3$ and dil. HCl speeds up when some con. HCl is added. As the concentration of the reactant increases, the rate of the reaction increases.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.