chemistry general knowledge questions

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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: Option A

Explanation:

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50. The iron ore magnetite consists of
A. Fe2O3 B. Fe3OH4
C. FeCO3 D. 3Fe2O3 .. 3H2O

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: Option A

Explanation:

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52. The major constituent of air is
A. nitrogen
B. carbon dioxide
C. oxygen
D. hydrogen

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: 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: Option D

Explanation:

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