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Chemistry

Chemistry
The third shell of an atom can have a maximum of ______ electrons

21
15
13
18

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Chemistry
Chloroform can be used as

Antimalarial
Anaesthetic
Antibiotic
Analgesic

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Chemistry
The wire of flash bulb is made of:

Silver
Copper
Barium
Magnesium

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Chemistry
The nuclear particles which are assumed to hold the nucleons together are

mesons
neutrons
electrons
positrons

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Chemistry
Total number of naturally occurring elements

98
62
92
110

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Chemistry
Which one of the following metals pollutes the air of a city having large number of automobiles?

Lead
Copper
Chromium
Cadmium

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