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Surface Chemistry — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12ChemistrySurface Chemistry2 Marks
Question
Define catalyst. Give example.
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Answer

A catalyst is defined as a substance which alter the rate of chemical reaction without itself undergoing chemical change. The phenomenon which involves the action of a catalyst is called catalysis.
e.g., $C _2 H _4+ H _2 \stackrel{ Ni }{\longrightarrow} C _2 H _6 Ni$ - catalyst.

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