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Chemistry

Chemistry
What is the atomic number of Oxygen

8
22
12
5

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Chemistry
Among the following the hardest metal is

Iron
Platinum
Tungsten
Gold

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Chemistry
When there are two electrons in the same orbital, they have:

Same or opposite spin
Opposite spin
Same spin
No spin

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Chemistry
Which metal is extracted from sea water?

Magnesium
Potassium
Beryllium
Aluminium

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Chemistry
Which of the following is the strongest base in aqueous solution ?

Ammonia
Diethylamine
Triethylamine
Ethylamine

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Chemistry
The number of neutrons present in an element having mass number 226 and atomic number 88 is :

88
138
50
314

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