A salt, when warmed with zinc powder and an NaOH solution, gives a gas that turns a filter paper soaked with an alkaline solution of `K_(2)[HgI_(4)]` brown. The salt responds to the brown ring test when acetic acid is used in place of sulphuric acid. The anion present in the salt is:

A filter paper soaked in salt X turns brown when exposed to HNO_(3) vapour. The salt X is

When a nitrate is warmed with zinc powder and an NaOH solution, a gas is evolved. Which of the following reagents will be turned brown by the gas?

When a nitrate is warmed with zinc powder and an NaOH solution, a gas is evolved. Which of the following reagents will be turned brown by the gas?

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of K_(2) [HgI_(4)] gave a brown precipitate. The substance (A) on heating gave a gas (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of K_(2) [HgI_(4)] gave a brown precipitate. The substance (A) on heating gave a gas (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

A white crystalline solid (A) on boiling with caustic soda solution gave a gas (B) which when passed through an alkaline solution of K_(2) [HgI_(4)] gave a brown precipitate. The substance (A) on heating gave a gasa (X) which rekindled a glowing splinter but does not give brown fumes with nitric oxide. The gas (X) is:

When a crystalline compound X is heated with K_(2)Cr_(2)O_(7) and concentrated H_(2)SO_(4) , a reddish brown gas A is evolved. On passing A into caustic soda, a yellow solution of B is formed. A yellow precipitate of C is obtained when a solution B is neutralised with acetic acid and then treated with a lead acetate solution. when X is heated with NaOH , a colourless gas is evolved which, when passed into a solution of K_(2)[HgI_(4)] , gives a reddish brown precipitate of D. ltBrgt Q. Which of the following is the composition of the brown precipitate (D) ?

A salt when heated with H_(2)SO_(4) librates violet gas which turns starch paper blue, salt may be