Which one is the correct decreasing order of the ionic radii of the ions?
N3- > O2-> F- > Na+
N3-> Na+> O2- > F-
Na+ >O2-> N3-> F-
Na+> F-> O2->N3-
The ionic radii of N3-, O2-, F- and Na+ follow the order
N3- > O2- > F- > Na+
N3- > Na+ > O2- > F-
Na+ > O2- > N3- > F-
O2- > F- > Na+ > N3-
18 carat gold contains
18% gold
24% gold
75% gold
60% gold
C.
75% gold
The weight of gold in jewellery is expressed in carats. It simply implies the number of parts by weight of gold in 24 parts by weight of the alloy.
Pure gold is 24 carats. 18 carat gold means that it contains 18 parts by weight ofpure gold in 24 parts by weight of the alloy.
% of gold =
% of gold = 75%
Which of the following is an organo-metallic compound?
Lithium ethoxide
Ethyl lithium
Lithium acetate
Lithium carbide
Pick out the isoelectronic structures from the following
I and II
I and IV
I and III
II, III and IV