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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
0.01 minute
100 years
13 days

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Chemistry
The gas used for artificial ripening of green fruit is

ethylene
carbon dioxide
ethane
acetylene

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Chemistry
Zone refining is used for the purification of

Ge
Au
Ag
Cu

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

engenol
geraniol
cineole
limonene

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

HF
HBr
HI
HCI

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