Revision PHC 121

sodium cobaltinitrite chemical structure

• Na3[Co(NO2)6]+

• Na4[Co(NO2)6]3+

Chemical structure of potassium pyroantimonate

• K2H2Sb2O7

• K2H2Sn2O9

...... gives a golden yellow flame

• calcium

• Sodium

• barium

Disodium hydrogen phosphate and ammonium hydroxide will precipitate ..................... as a white crystalline precipitate

• Sodium

• Potasium

• magnesium

..............gives brick red color with flame

• calcium

• sodium

• barium

..................gives green color with flame

• Barium

• calcium

............is the group reagent of Alkaline Earth Group

• (NH4)2CO3

• (NH4)2CO3 in alkaline media

• (NH4)2CO3 in acidic media

A Reddish brown ppt formed after addition of conc. NH4OH to group III

• Cr

• Fe

• AL

The separation depends on the fact that Al(OH)3 and Cr(OH)3 are amphoteric (soluble in NaOH) while Fe(OH)3 is not.

• False

• True

Zn(OH)2 is .................. (dissolves in excess NaOH)