When `NH_4SCN` is added to the aquous solution of `FeCl_3` the solution turns red but with addition of `NH_4CI`fedds the red Coluration. Explain. Shall it give same result if `CaCO_3`is heated in a open and closed Container separately?

Will the same result be obtained if CaCO_3(s) is heated in an open vessel and in a closed vessel separately?

"When NH_(4)SCN (colourless) is added to dilute solution of FeCl_(3) (light yellow), the colour o the solution becomes deep red but on addition of NH_(4)Cl solution (colourless) the red colour faded." Why?

What is a reversible reaction? What is rate of a reaction? Would you get the same result during heating of CaCO_3 separately in an open container and a closed container? Give reason.

An aqueous solution of a gas (X) -turns red litmus blue. When excess of this solution is added to copper sulphate solution, it turns deep blue. When this solution is added to FeCl_(3) solution, a brownish precipitate soluble in HNO_(3) is obtained. Identify the gas (X) and write balanced equations for each of the reaction involved.

How much of NH_4Cl should be added to 1L 0.1(M) NH_3 solution so that the pH of the mixed solution becomes 9.0? Assume that addition of NH_4Cl does not change the volume of the solution. lGiven: pK_b(NH_3)= 4.74 ]

Write down the name of brown precipitate formed during the reaction of FeCl_3 solution and NH_4OH solution.

Adding a few drops of dilute FeCl_(3) solution to a freshly precipitated Fe(OH)_(3) sol gives a red colloidal solution . This phenomenon is known as-

A solution contains Ag^+,Ca^(2+) and Al^(3+) each having a concentration of 0.1(M). Na_3PO_4 is added to the solution. Which will be precipitated first when the concentration of PO_4^(-3) in the solution is the lowest ? [ Given : K_(sp) values of Ag_3PO_4,Ca_3(PO_4)_2 and AlPO_4 and 10^(-16) , 10^(-33) and 10^(-20) respectively]

A certain salt X, gives the following result. When conc. H_2SO_4 is added to a hot solution of X, white crystal of a acid Z separates out. Write equation for all the above reactions and identify X, Y and Z.