General Knowledge - Chemistry

Exercise :: Chemistry - Section 1

  • Chemistry - Section 1
43. 

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

Answer: Option D

Explanation:

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44. 

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

Answer: Option C

Explanation:

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45. 

The gas used for artificial ripening of green fruit is

A. ethylene
B. ethane
C. carbon dioxide
D. acetylene

Answer: Option A

Explanation:

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46. 

Zone refining is used for the purification of

A. Au
B. Ge
C. Ag
D. Cu

Answer: Option B

Explanation:

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47. 

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

Answer: Option A

Explanation:

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48. 

The molecule which has the highest percentage of ionic character among the following is

A. HI
B. HF
C. HCI
D. HBr

Answer: Option B

Explanation:

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