Questions

Marketspace refers to an information and communication based electronic exchange environment. It is a relatively new concept in marketing. Since physical boundaries no longer interfere with buy/sell decisions, the world has grown into several industry specific marketspaces which are integration of marketplaces through sophisticated computer and telecommunication technologies.

W is the symbol for chemical element Tungsten or Wolfram.

It is used in making filaments of bulbs.

Sodium chloride:

The solubility rules tell you that all halides are soluble with the exception of those formed with siver, mercury, and lead ions. Since this is not the case here, sodium chloride will be soluble.

Silver nitrate:

It is soluble because all nitrates are soluble, without exception.

Potassium sulfate:

It is soluble because all sulfates are soluble with the exception of those formed with silver, calcium, barium, mercury, lead, and strontium ions.

Copper (II) hydroxyde:

It is insoluble because all hydroxides are insoluble with the exception of those formed with alkali metal ions and barium.