For coagulating As2S3 colloidal solution which of the following will have the lowest coagulation value?
NaCl
KCl
BaCl2
AlCl3
In the metallurgy of which of the following cupellation process is used?
Copper
Silver
Iron
Aluminium
Cryolite is used in the electrolytic extraction of aluminium
to obtained more alumimium
to decompose bauxite
to protect anodes
as a reducing agents
Which of the following elements exhibits the most basic properties?
F
Cl
Br
I
D.
I
Along the group from top to bottom basic character of element increases. So, basic character of halogens are I > Br> Cl> F.
Elements which generally exhibit multiple oxidation states and whose ions are usually coloured are
metalloids
non- metals
tranistion elements
gases
The transition metals mostly are
diamagnetic
paramagentic
neither diamagnetic nor paramagnetic
both diamagnetic and paramagnetic.
The correct statement in respect of d-block elements is
they are all metals
they show variable valency
they form coloured ions and complex salts
All the above statements are correct