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Chemistry

Chemistry
Which one of the following does not contain Silver ?

Ruby Silver
Lunar Caustic
German Silver
Horn Silver

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

Smoke
Aerosols
Mists
Fumes

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Chemistry
What is the most commonly used substance in fluorescent tubes?

Sodium oxide and argon
Sodium vapour and neon
Mercury vapour and argon
Mercury oxide and neon

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Chemistry
The percentage of Nitrogen in Air is

0.03
85.02
78.03
0.94

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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?

3 billion years
0.01 minute
13 days
100 years

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Chemistry
The property of hydrogen which distinguishes it from alkali metals is

Its non-metallic character
Its electropositive character
Its reducing character
Its affinity for non-metal

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