Chemistry
Which method will be employed to test the hardness of water?

Boiling
Formation of lather with soap
None of these
Distillation

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Chemistry
The open "Sigrees" or coal stoves often require fanning to sustain burning because of

Interrupted release of moisture from the material
Accumulation of smoke and dust over the sigrees
Tendency of carbon dioxide to form a layer along with dust smoke
Lack of oxygen in the surroundings of sigrees

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Chemistry
Atoms of different elements have

Same number of electrons and neutrons
Different atomic number and different number of valence electrons
Different atomic number and same eletronic configu-ration
Same atomic number and same electronic configuration

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