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Chemistry

Chemistry
Which one among the following is not a mixture?

Steel
Brass
Glass
Graphite

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Chemistry
The hydronium ion is

H3O+
HO -
H2+
H+

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Chemistry
The drug ‘Marijuana’ is a

Sedative
Mental stimulant
Tranquillizer
Hallucinating substance

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Chemistry
0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by

6
7
3
4

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Chemistry
The metal present in vitamin B12 is

Mo
Mg
Co
Fe

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Chemistry
Which one is the most reactive halogen

Chlorine
Bromine
Fluorine
Iodine

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