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Chemistry

Chemistry
What is the mass percentage of carbon in carbon dioxide (CO2)

0.323
0.158
0.201
0.273

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Chemistry
One carat of diamond is equal to

250 mg
150 mg
200 mg
100 mg

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Chemistry
The metal ion present in Vitamin B12 is

Nickel
Iron
Cobalt
Zinc

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Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

Smaller atomic radius
High nuclear charge
Stable half filled 2p sub level
High bond dissociation energy

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Chemistry
Atoms of same element having different mass numbers are called________

Isomers
Isotopes
Isotones
Isobars

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Chemistry
The metal chiefly used for galvanising iron is :

Cadmium
Tin
Zinc
Mercury

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