GK-Chemistry Question and Answer
GK-Chemistry Question and Answer
41. The following are the half lives of four active isotopes. Which one of the following is the most
dangerous to handle?
dangerous to handle?
- 3 billion years
- 100 years
- 0.01 minute
- 13 days
42. The gas used for artificial ripening of green fruit is
- ethylene
- ethane
- carbon dioxide
- acetylene
44. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is
- cineole
- engenol
- geraniol
- limonene
45. The molecule which has the highest percentage of ionic character among the following is
A.
A.
- HI
- HF
- HCI
- HBr
46. The high reactivity of fluorine is due to
- its high electro negativity
- small size of fluorine atom
- availability of d-orbitals
- strong F - F bond
47. 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
electron to jump from 2nd orbit to 3rd orbit is
- 5x/36
- 5x
- 7.2 x
- x/6
49. The main chemical constituent of clay is
- silicon oxide
- aluminium borosilicate
- zeolites
- aluminium silicate
50. The mineral containing both magnesium and calcium is
- magnesite
- calcite
- carnallite
- dolomite