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Think big, think fast, think ahead. Ideas are no one’s monopoly
- Dheerubhai Ambani
बड़ा सोचो , जल्दी सोचो , आगे सोचो . विचारों पर किसी का एकाधिकार नहीं है .
- धीरूभाई अंबानी


    Chemistry Question & Answer in English

16.
Temporary hardness of water is due to the presence of -
A.  Magnesium Bicarbonate
B.  Magnesium Sulphate
C.  Calcium chloride
D.  Calcium carbonate

17.
Hydrogen does not combine with -
A.  Antimony
B.  Bismuth
C.  Sodium
D.  Helium

18.
Pure  water can be obtained from sea water by -
A.  Centric fugation
B.  Reverse osmosis
C.  Plasmolysis
D.  Sedimentation

19.
Nuclear energy is based on the conversion of -
A.  Protons into Neutrons
B.  Neutrons into Protons
C.  Mass into Energy
D.  Uranium into Radium

20.
An electrically charged atom or a group of atoms is known as -
A.  Meson
B.  Ion
C.  Proton
D.  Cyclotron

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