Amylase (present in saliva and pancreatic juice) hydrolyses starch into maltose and dextrins. Pepsin digests proteins in the stomach. Lipase breaks down fats. Trypsin also digests proteins. Enzymes are specific biocatalysts.
Explanation:
Ethene (C₂H₄) adds Br₂ across the double bond to form 1,2-dibromoethane. Bromine water decolorizes, a test for unsaturation. Alkanes undergo substitution.
Explanation:
Aluminium oxide (Al₂O₃) reacts with both acids and bases, so it is amphoteric. Na₂O and MgO are basic; CuO is basic. ZnO is also amphoteric.
Explanation:
Hydrogen has ~150 kJ/g; LPG ~50 kJ/g; CNG ~55 kJ/g; diesel ~45 kJ/g. Hydrogen has highest energy per mass but low density, posing storage challenges.
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