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Chemistry

Chemistry
Greenhouse effect is caused by

Carbon monoxide
Nitrogen dioxide
Nitrogen
Carbon dioxide

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

138
314
88
50

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

13 days
0.01 minute
3 billion years
100 years

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Chemistry
Concentration of a material which is lethal to 50% animal is called

NOAEL
LD50
ADI
LC50

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Chemistry
What is the element required for solar energy conversion ?

Silicon
Ultra pure carbon
Beryllium
Tantalum

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Chemistry
Which of the following is not present in RNA

Ribose
Uracil
Thymine
Phosphate

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MORE MCQ ON Chemistry

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