Name the gas evolved [formula is not acceptable]. The gas produced by the action of dilute nitric acid on copper.

Match each substance A to E listed below with the appropriate description given below:

(A) Sulphur

(B) Silver chloride

(C) Hydrogen chloride

(D) Copper [II] sulphate

(E) Graphite.

A non-metal which reacts with concentrated nitric acid to form it's own acid as one of the product.

Select the correct answer from A, B, C, D and E —

(A) Nitroso Iron [II] sulphate

(B) Iron [III] chloride

(C) Chromium sulphate

(D) Lead [II] chloride

(E) Sodium chloride.

The compound responsible for the brown ring in the brown ring test for identifying the nitrate ion.

A blue crystalline solid 'X' on heating gave a reddish brown gas 'Y', a gas which relits a glowing splint and a residue which is black. Identify X and Y, and write the equation for the action of heat on X.