Exercise 2

Question 16 :

Zone refining is used for the purification of


A). Au
B). Ge
C). Ag
D). Cu
Answer : Option B

Question 17 :

The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is


A). cineole
B). engenol
C). geraniol
D). limonene
Answer : Option A

Question 18 :

The molecule which has the highest percentage of ionic character among the following is


A). HI
B). HF
C). HCI
D). HBr
Answer : Option B

Question 19 :

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

Question 20 :

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