Identify a blue solution that turns deep blue on addition of an excess of `NH_(4)OH. `

An aqueous pink solution of cobalt (II) chloride changes to deep blue on addition of excess of HCl . This is because ....... .

The solution in a beaker turns blue if

A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of NH_(4)OH and on passing H_(2)S . Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (E) are identified as:

State why the blue ppt . Formed on addition of NH_(4)OH to CuSO_(4) soln .dissoves to give adeep blue solution with excess of NH_(4)OH . Give an equation for the reaction . State why Zn(OH)_(2) is soluble in excess of NH_(4)OH .

An aqueous solution turns red litmus paper to blue. Excess addition of which of the following solution would reverse the change?

A solution when diluted with H_(2)O And boiled gives a white precipitate .On the addition of excess NH_(4)Cl & NH_(4)OH the volume of the precipitate decreases leaving behind a white gelationtious precipitate identify the precipitate which dissolves in NH_(4)OH//NH_(4)Cl :

Which of the following nitrate salt solution neither produce ppt. with excess NaOH nor with excess NH_(4)OH solution?

Name : a metallic hydroxide soluble in excess of NH_( 4)OH .

A solution turns red litmus blue, its pH is likely to be

When NH_(4)Cl is added to a solution of NH_(4)OH :