49.
The high reactivity of fluorine is due to
A. its high electro negativity
B. small size of fluorine atom
C. availability of d-orbitals
D. strong F – F bond
Answer & Explanation
Answer: Option A
Explanation:
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50.
The iron ore magnetite consists of
A. Fe2O3 B. Fe3OH4
C. FeCO3 D. 3Fe2O3 .. 3H2O
Answer & Explanation
Answer: Option A
Explanation:
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51.
The 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/36
B. 5x
C. 7.2 x
D. x/6
Answer & Explanation
Answer: Option A
Explanation:
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52.
The major constituent of air is
A. nitrogen
B. carbon dioxide
C. oxygen
D. hydrogen
Answer & Explanation
Answer: Option A
Explanation:
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53.
The main chemical constituent of clay is
A. silicon oxide
B. aluminium borosilicate
C. zeolites
D. aluminium silicate
Answer & Explanation
Answer: Option D
Explanation:
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54.
The mineral containing both magnesium and calcium is
A. magnesite B. calcite
C. carnallite D. dolomite
Answer & Explanation
Answer: Option D
Explanation:
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