Question

The shape selective catalysts are
1. Enzymes
2. Zeolites
3. Colloids
4. Gels

Answer 1

Shape-Selective Catalysis are Zeolites.
The catalytic reaction that depends upon the structure of pores of the catalyst and the size of the reactant and product molecules is called shape/selective catalysis.

Zeolites are good shape/selective catalysts because of their honeycomb-like structures. Zeolites are aluminosilicates, i.e., three dimensional network silicates in which some silicon atoms are replaced by aluminium atoms. They are found in nature as well as synthesized for catalytic selectivity.