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CHEMISTRY

Chemistry
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

3 billion years
13 days
100 years
0.01 minute

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Chemistry
The gas used for artificial ripening of green fruit is

ethane
acetylene
carbon dioxide
ethylene

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Chemistry
Zone refining is used for the purification of

Cu
Au
Ge
Ag

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Chemistry
The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

geraniol
engenol
cineole
limonene

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

HF
HCI
HBr
HI

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