1. The method that cannot be used for removing permanent hardness of water is
A. adding sodium carbonate
B. distillation
C. adding caustic soda
D. boiling
2. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A. 3 billion years
B. 100 years
C. 0.01 minute
D. 13 days
3. The gas used for artificial ripening of green fruit is
A. ethylene
B. ethane
C. carbon dioxide
D. acetylene
4. Zone refining is used for the purification of
A. Au
B. Ge
C. Ag
D. Cu
5. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
A. cineole
B. engenol
C. geraniol
D. limonene
6. The molecule which has the highest percentage of ionic character among the following is
A. HI
B. HF
C. HCI
D. HBr
ANSWERS:
1. Answer: Option D
2. Answer: Option C
3. Answer: Option A
4. Answer: Option B
5. Answer: Option A
6. Answer: Option B
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