Salt Analysis

Which of the metal ion imparts crimson red color to the flame?

• Ca

• Ba

• Sr

• K

Which statement about ammonium carbonate is not correct?

• It reacts with BaCl2(aq) to form a white precipitate.

• It effervesces with dilute sulphuric acid.

• It release a pungent smelling gas when heated with NaOH(aq).

• It has the formula NH4CO3.

Three qualitative tests are carried out on a solution of an unknown compound.

Test 1: On heating with NaOH(aq), a pungent smelling gas evolves which turns red litmus paper blue.

Test 2: On addition of AgNO3(aq), a white precipitate forms which is soluble in dilute NH3(aq).

Test 3: On addition of Na2CO3(aq), there is no visible reaction.

What is the unknown compound?

• ammonium bromide, NH4Br

• ammonium chloride, NH4Cl

• hydrochloric acid, HCl

• sodium chloride , NaCl

When dilute HCl is added to lead salt it forms a

• white precipitate

• yellow precipitate

• blue precipitate

• no precipitate

The reagent used to confirm the presence of acetate ion is

• dil HCl

• NaOH

• Neutral FeCl3

• H2SO4