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CHEMISTRY

Chemistry
How many neutrons are there in 92U238 atom ?

238
146
92
330

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Chemistry
The number of neutrons present in an element having mass number 226 and atomic number 88 is :

314
138
88
50

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Chemistry
Who modified Bohr's theory by introducing elliptical orbits for electron path

Thomson
Hund
Sommerfeld
Rutherford

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Chemistry
Which one of the following contributes largely to the ‘green house effect’ ?

Water vapour
Carbon monoxide
Carbon dioxide
Ozone

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Chemistry
An important green-house gas other than methane being produced from the agricultural fields is

Nitrous oxide
Arsine
Sulphur dioxide
Ammonia

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