Chemistry - Questions (Section-1)
49The high reactivity of fluorine is due to
A. its high electro negativityB. small size of fluorine atom
C. availability of d-orbitals D. strong F - F bond
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50The ionisation energy of hydrogen atom in the ground state is x KJ. The energy required for an electron to jump from 2nd orbit to 3rd orbit is
A. 5x/36B. 5x
C. 7.2 x D. x/6
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51The iron ore magnetite consists of
A. Fe2O3B. Fe3OH4
C. FeCO3 D. 3Fe2O3 .. 3H2O
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52The main chemical constituent of clay is
A. silicon oxideB. aluminium borosilicate
C. zeolites D. aluminium silicate
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53The major constituent of air is
A. nitrogenB. carbon dioxide
C. oxygen D. hydrogen
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54The mineral containing both magnesium and calcium is
A. magnesiteB. calcite
C. carnallite D. dolomite
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