Describe the flame test for barium.

Match List-I with List-II and select the correct answer using the codes given below.

State one relevant observation for of the following:

Anhydrous calcium chloride is exposed to air for some time.

Distinguish between the following pair of compounds using a reagent as a chemical test:

• Magnesium chloride and magnesium nitrate solution.

• A chloride dissolves appreciably in cold water.
• When placed on a platinum wire in Bunsen flame, no distinctive colour is noticed.

The cation which shows both of the above properties is

What could be the metal, if a chemistry student takes a small amount of paste of metallic salt on clean platinum wire loop of the salt with concentrated $\mathrm{HCl}$ and keeps it in a non-luminous bunsen flame, the colour of the flame changes to grassy green ?

In the following reactions, find compound A which imparts a golden yellow color to the Bunsen flame.

${\mathrm{A}}_{\left(\mathrm{aq}\right)}+\mathrm{Zn}\to {\mathrm{B}}_{\left(\mathrm{g}\right)}$
${\mathrm{A}}_{\left(\mathrm{aq}\right)}+\left(\mathrm{c}\right)\mathrm{ }\stackrel{\mathrm{\Delta }}{\to }\mathrm{ }{\mathrm{PH}}_3$
${\mathrm{A}}_{\left(\mathrm{aq}\right)}+{\mathrm{NH}}_4\mathrm{Cl}\to {\mathrm{D}}_{\left(\mathrm{g}\right)}$