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Chemistry

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

LD50
LC50
ADI
NOAEL

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Chemistry
Name two elements that find wide application in transistor industry

Tungsten and Platinum
Carbon and Platinum
Iridium and Germanium
Silicon and Germanium

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Chemistry
The value of gas constant R in Ergs deg–1 mole–1 is

8.314 × 107
8.413 × 107
4.183 × 107
8.341 × 107

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Chemistry
The acid which fails to liberate carbon dioxide from sodium bicarbonate is :

Carbonic acid
Acetic acid
Formic acid
Sulphuric acid

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Chemistry
The mass number of an atom is equal to

the number of protons and electrons
the number of protons
the number of neutrons
the number of nucleons

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Chemistry
Which one element from below list is liquid at room temperature

Zinc
Bromine
Lead
Argon

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