Important questions based on NCERT syllabus for Chapter 4 - Carbon and Its Compounds:
Question-1: Name the enzyme which converts:
- Milk into curd (yogurt)
- Cane sugar into glucose and fructose
- Glucose into ethanol.
Solution: 1. Lactase converts milk into curd
2. Invertase converts cane sugar (sucrose) into glucose and fructose
3. Zymase converts glucose into ethanol.
Question-2: State the principle on which the cleansing action of soap is based.
Solution: 1. The cleansing action of soap is based on its tendency to act as a bridge between water and oil drops containing dirt particles by its amphiathic nature.
2. Dirt is attracted by hydrophobic end of soap which on rinsing moves out of clothes. They form a stable emulsion also called micelle with soap outside and dirt inside.
3. This helps in removing oil drops containing dirt particles from clothes. The clothes become clean.
Question-3: Write a short note on catenation.
Solution: 1. Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called catenation.
2. These compounds may have long chains of carbon, branched chains of carbon or even carbon atoms arranged in rings. In addition, carbon atoms may be linked by single, double or triple bonds.
3. No other element exhibits the property of catenation to the extent seen in carbon compounds. The carbon-carbon bond is very strong and hence stable. This gives us the large number of compounds with many carbon atoms linked to each other.