A white solid is either `Na_(2)O` or `Na_(2)O_(2)`. A piece of red litmus paper turns white when it is dipped into a freshly made aqueous solution
of the white solid.
a. Identify the substance and explain the balanced equation.
b. Explain what would happen to the red litmus if the white solid
were the other compound.

The dilute aqueous solution of H_(2)O_(2) turns blue litmus red. True/False

A chemical A is used for the preparation of washing soda to recover ammonia. When CO_(2) is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?

A chemical A is used for the preparation of washing soda to recover ammonia. When CO_(2) is bubbled through an aqueous solution of A, the solution turns milky. It is used in white washing due to disinfectant nature what is the chemical formula of A?

The gas liberated on heating a mixture of two salts with NaOH , gives a reddish brown precipitate with an alkaline solution of K_(2)Hgl_(4) . The aqueous solution of the mixture on treatment with BaCl_(2) gives a white precipitate which is sparingly soluble in conc. HCl. On heating the mixture of K_(2)Cr_(2)O_(7) and conc H_(2)SO_(4) red vapours (A) are produced. The aqueous solution of the mixture gives a deep blue colouration (B) with potassium ferricyanide solution. Idnetify the radicals in the given mixture and write the balanced equations for the formation of (A) and (B).

Salt (A) is a white deliquescent solid. On heating the solid, brown fumes were evolved. On adding NaOH to the salt solution of (A), a white gelatinous ppt. was obtained. On adding, a drop of blue litmus solution to the ppt., a blue lake was obtained. On adding DPA to the salt solution, a deep blue colouration was obtained. Identify the salt and give the equations involved.

When aqueous solution of borax is acidified with hydrochloric acid, a white crystalline solid is formed which is soapy to touch. Is this solid acidic or basic in nature ? Explain.

A small piece of calcium metal is put into a small trough containing water. There is effervescence and white turbidity is formed. What do you observe when a few drops of red litmus solution are added to the turbid solution ?

Anhydrous white solid (A) on addition of potassium iodine solution gave a brown precipitate which turned white (B) on addition of excees of hypo solution. When potasium cyanide is added to an aqeous Solution of (A) a white precipitate is formed which then dissolved in excess forming (C ) A Solution (%) of (A) on adding to a solution of white portion of egg produced violet colouration in alkaline medium (i.e) in presence of NaOH) identify compound (A) and explain the reactions.

When a metal rod M is dipped into an aqueous colourless concetrated solution of compound N, the solution turns light blue. Addition of aqueous NaCl to the blue solution gives a white precipitate O. Addition of aqueous NH_3 dissolves O and gives an intense blue solution. Q. The compound N is

A solid white cube with an edg of 8 inches is painted red . The cube is then sliced into 512 1-inch cubes . How many of these cubes have exactly 2 red faces ?