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Chemistry

Chemistry
How many neutrons does iron have

8
26
30
13

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Chemistry
A thick paste of cement, sand and water is called

Concrete
Mortar
R.C.C.
Kiln

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

LD50
LC50
ADI
NOAEL

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Chemistry
Which of the following does the Nucleus of an atom consist of?

Protons and neutrons
Electrons
Protons and electrons
Protons

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Chemistry
Vinegar is ________ .

Glacial acetic acid
Diluted formic acid
Glacial formic acid
Diluted acetic acid

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Chemistry
Periodic table contains how many periods

10
7
6
8

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