Preliminary Test for Radicals

How many of the following reactions will give green colour in the product?

(i) $\mathrm{Na}\left({\mathrm{NH}}_4\right)·{\mathrm{HPO}}_4·4{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{\Delta }}{⟶}{\mathrm{NaPO}}_3\stackrel{\mathrm{CoO}}{⟶}$Product

(ii) $\mathrm{Na}\left({\mathrm{NH}}_4\right)·{\mathrm{HPO}}_4·4{\mathrm{H}}_2\mathrm{O}\stackrel{\mathrm{\Delta }}{⟶}{\mathrm{NaPO}}_3\stackrel{{\mathrm{Cr}}_2{\mathrm{O}}_3}{\to }$Product

(iii) $\mathrm{CoO}+\mathrm{ZnO}⟶$Product

(iv) $\mathrm{CoO}+\mathrm{MgO}⟶$ Product

What is flame test?

In which of the following cases brown colour gas is not evolved?

The salt that cannot release reddish brown gas when heated in a dry test tube:

Which of the given carbonates are soluble in water?

Why carbonates of alkaline earth metals are insoluble in water?

Calcium metal burns with blue flame.

Describe the flame test for calcium.

_____ metal burns with orange-red flame.

Orange-red indicates the presence of:

Blue-green flame is an indication of the presence of _____ions.

Blue-green flame indicates the presence of:

The pale green flame is due to the metal ions of: 

Pale green flame is an indication of the presence of _____ions.

Describe the flame test for barium.

Barium metal burns with red flame.

_____ metal burns with pale green flame.

A metal burns with a yellow flame is; 

Heat a salt with copper turnings and concentrated sulphuric acid. The evolution of reddish-brown fumes is due to:  

The colour of the nitrogen dioxide gas is _____.