Which one of the following salts gives a green-coloured flame when the salt is tested by a $Pt$ wire?

Identify the technique used to know the binding nature of nanomaterials.

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?

What is a fusion mixture?

On performing a borax-bead test with a given inorganic mixture for qualitative analysis,the colour of the bead was found to be emerald green both in oxidising and reducing flame. It indicates the possibility of the presence of