Which of the following is/are noble metals?
a) silver
b) gold
c) osmium
d) all of these
Which of the following is/are sometimes included in noble metals?
a) rhenium
b) mercury
c) copper
d) all of these
The noble metals are valuable because of their…………
a) inertness
b) rarity
c) ornamentation
d) all of these
Which of the following is/are considered precious?
a) gold
b) silver
c) platinum
d) all of these
Silver occurs in………...…..forms.
a) two
b) three
c) four
d) five
Pure silver is ……
a) hard
b) soft
c) very hard
d) very soft
