Assign $A$,$B$,$C$,$D$ from the given type of reaction.
$2KI + FeCl_2 \longrightarrow$ No reaction

If steel is heated to a temperature well below red heat and is then cooled slowly,the process is called

The microcosmic salt is

Given below are two statements:
Statement $I$: Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.
Statement $II$: Cuprous metaborate is obtained by heating boric anhydride and copper sulphate in a non-luminous flame.
In the light of the above statements,choose the most appropriate answer from the options given below.

In the flame test of a mixture of salts,a green flame with a blue centre was observed. Which one of the following cations may be present?

Which of the following salts does not give a borax bead test?