Question

Metallic tin and conc $HN{O_3}$ reacts to form:
A.Metastannic acid
B.Stannic nitrate
C.Stannous nitrate
D.Stannous acid

Answer 1

Tin is a soft, white silvery metal. It is not easily oxidized and can resist corrosion because it is protected by the layer of oxide. Its properties are somewhat similar to lead and germanium. Nitric acid is a very strong acid and is also known as aqua fortis.

Complete step by step answer:
Reaction between metallic tin and concentrated nitric acid is given as follows: $Sn + 4HN{O_3} \to {H_2}Sn{O_3} + 4N{O_2} + {H_2}O$
When metallic tin reacts with concentrated nitric acid it forms metastannic acid, nitrogen oxide gas and water.
Reaction between very dilute nitric acid /$6\%$ reacts with tin, the reaction is given as follows:$8Sn + 10HN{O_3} \to N{H_4}N{O_3} + 8SnN{O_3} + 3{H_2}O$
When metallic tin reacts with very dilute nitric acid it forms ammonium nitrate, water and tin nitrate.
Reaction between dilute nitric acid$20\%$ reacts with tin, the reaction is as follows:
$4Sn + 10HN{O_3} \to N{H_4}N{O_3} + 4Sn{(N{O_3})_2} + 3{H_2}O$
When metallic tin reacts with dilute nitric acid it forms ammonium nitrate, water and tin $(II)$ nitrate.
Thus when tin reacts with concentrated nitric acid it forms metastannic acid.

So, the correct answer is option A) metastannic acid.

Additional Information:
-Tin is used in coating, plating and polishing of metals.
-It is used in the manufacturers of food containers.
-It is also used as electrodes in the batteries.
-Tin metal is used in the manufacture of alloys such as bronze and copper.

Note: Tin reacts with dilute acids slower than many other metals and always heat is required in order to speed up the reaction. This property means that it can be used as a protective coating on other metals. It reacts faster in the presence of strong acids.