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Chemistry

Chemistry
How many electrons can be accommodated in d-orbital

3
8
10
6

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Chemistry
The metal ion present in Vitamin B12 is

Iron
Nickel
Zinc
Cobalt

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Chemistry
The structure of (HPO3)3 is

Tetrahedral
Octahedral
Linear
Cyclic

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Chemistry
The atomic number of carbon is 6 and its atomic mass is 12. How many are there protons in the nucleus of carbon ?

Zero
12
6
18

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Chemistry
It is dangerous to leave the car engine running in a closed garage, because it may cause serious pollution due to poisoning by emission of

CO
Unburnt petrol
CO2
SO2

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Chemistry
Diamonds are glittering and attractive because light incident on them undergoes

Hundred percent transmission
Highest refraction
Multiple internal reflections
Multiple surface reflections

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