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Chemistry

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

138
88
314
50

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Chemistry
Chemically ‘Quick Silver is known as

Copper
Aluminium
Mercury
Silver

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Chemistry
Particulates (< 1 µm size) remaining suspended in air indefinitely and transported by wind currents are called

Smoke
Fumes
Aerosols
Mists

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Chemistry
At room temperature, the metal that remains liquid is:

Zinc
Mercury
Lead
Platinum

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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?

100 years
3 billion years
0.01 minute
13 days

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Chemistry
The chemical substance present in bones and teeth is

Calcium chloride
Calcium sulphate
Calcium phosphate
Calcium borate

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