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Chemistry

Chemistry
Which among the following is found in chlorophyll ?

Fe2+
Mg2+
A l3+
Ca2+

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Chemistry
Atoms having the same number of protons but different number of neutrons are called :

Isotopes
Cations
Anions
Higgs-boson

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Chemistry
The ionic radii of N3-, O2-, F- and Na+ follows the order

O2- > F- > Na+ > N3-
N3- > O2- > F- > Na+
Na+ > O2- > N3- > F-
N3- > Na+ > O2- > F-

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Chemistry
Threshold limit value of copper in the atmospheric air is

5.0 mg/m3
0.01 mg/m3
0.001 mg/m3
1.0 mg/m3

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Chemistry
If we burn graphite,

It will not burn
It will change into diamond
Residue will be left
No residue will be left

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Chemistry
Quartz is made of

Sodium Silicate
Calcium Sulphate
Sodium Sulphate
Calcium Silicate

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