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

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

Calcium metal burns with blue flame.

Describe the flame test for calcium.

_____ metal burns with orange-red flame.

Orange-red indicates the presence of:

A gas that is on heating liberated has a pungent smell and bleaching action is:

When salt is heated the presence of chloride ions indicates, if the colour of the gas is _____. 

When concentrated sulphuric acid is added to the sample, a colourless gas with a pungent smell and dense white fumes with ammonium hydroxide. The possible anion is:

Identity the salt $\mathrm{Q}$ from the observation given below:

When dilute $\mathrm{H}\mathrm{C}\mathrm{l}$ is added to a salt $\mathrm{Q}$, a brisk effervescence is produced and the gas turns lime water milky. When $\mathrm{N}{\mathrm{H}}_4\mathrm{O}\mathrm{H}$ solution is added to the above mixture (after adding dilute $\mathrm{H}\mathrm{C}\mathrm{l}$), it produces a white precipitate which is soluble in excess $\mathrm{N}{\mathrm{H}}_4\mathrm{O}\mathrm{H}$ solution.

Flame test is not given by :

On performing the flame test salt $\text{'}\mathrm{X}\text{'}$ produces a lilac / violet coloured flame and its solution gives a white precipitate with silver nitrate solution, which is soluble in ammonium hydroxide solution. Identify $\text{'}\mathrm{X}\text{'}$.

Which metal ion imparts brick-red colour to the flame?

State the colour of the residue obtained on cooling when copper carbonate is heated.

Magnesium chloride when exposed to moisture absorbs it and forms an aqueous solution. This type of substance is a:

Which of the following chloride is most soluble in water?

Find the total number of sulphide ppt. which are soluble in yellow ammonium sulphide
$\mathrm{CuS}, \mathrm{HgS}, \mathrm{CdS}, \mathrm{SnS}, {\mathrm{SnS}}_2, {\mathrm{As}}_2{\mathrm{S}}_5, {\mathrm{Sb}}_2{\mathrm{S}}_5, {\mathrm{Bi}}_2{\mathrm{S}}_3, \mathrm{PbS}, {\mathrm{Sb}}_2{\mathrm{S}}_3$

Which one of the following does not impart colour to the flame?

Solubility of alkaline earth metal carbonates in water is as follows:

Why does ${\mathrm{MgSO}}_4$ dissolve in water but ${\mathrm{BaSO}}_4$ does not?