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SURA PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS -ADDITIONAL QUESTIONS & ANSWERS ( FILL IN THE BLANKS )
- Aluminium reacts with caustic alkalis to form .
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- acid does not attack aluminium.
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- Copper pyrite , copper glance and cuprite are ores of .
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- Copper pyrite yields nearly % of the world production of copper .
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- The chief ore of copper is .
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- Blister copper contains % of pure copper and % of impurities .
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- Blister copper is purified by
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- When electric current is passed through the electrolytic solution, ...
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- Haematite, magnetite and Iron pyrite are ores of .
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- Chlorine reacts with copper , resulting in the formation of .
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- is used in electroplating .
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- is the second most abundant metal available in the Earth's crust ...
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- The number of periods in the modern periodic table is .
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- The number of elements present in the longest period is .
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- Both second and third period contain .
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- The number of elements present in both fourth and fifth period is .
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- Lanthanides are present in .
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- Actinides are present in .
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- Four elements recently discovered are placed in the
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- First group elements are called as .
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