Classify the following reactions as homegeneous and heterogeneous catalysis :
(a) Vegetable oil `(l)+H_(2)(g)overset (Ni(s))rarr ` Vegetable ghee (s)
(b) `C_(12)H_(22)O_(11)(aq)+H_(2)O(l) overset (H_(2)SO_(4)(aq))rarr C_(6) H_(12)O_(6)(aq)+C_(6)H_(12)O_(6)(aq)`

Explanation

To classify the given reactions as homogeneous or heterogeneous catalysis, we need to analyze the phases of the reactants and the catalyst involved in each reaction.

### Step-by-Step Solution:

1. **Identify the Phases of Reactants and Catalyst in Reaction (a)**:
- Reaction: Vegetable oil `(l) + H_(2)(g) overset (Ni(s)) rarr Vegetable ghee (s)`
- Here, vegetable oil is in the liquid phase `(l)`, hydrogen is in the gas phase `(g)`, and nickel (Ni) is a solid `(s)`.
- Since the catalyst (Ni) is in a different phase (solid) compared to the reactants (liquid and gas), this reaction is classified as **heterogeneous catalysis**.
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