Tin reacts with conc. HNO3 and gives: (a) stannic nitrate □(b) stannous nitrate (c) metastannic

step 1 In this problem, tin reacts with conch HNO3 and gives this acid. So according to the option here

Tin reacts with conc. HNO3 and gives: (a) stannic nitrate...

Key Concepts

Redox Reactions in Acidic Medium

When a metal reacts with a concentrated acid such as nitric acid, the acid not only supplies protons but can also act as a strong oxidizing agent. In such reactions, the metal is oxidized while the nitric acid is reduced, leading to formation of various nitrogen oxides. This understanding is crucial when analyzing the products of a reaction involving metals and nitric acid, as the oxidizing power of nitric acid often directs the metal to a higher oxidation state during the reaction.

Oxidation States of Tin

Tin is a metal that exhibits multiple oxidation states, typically +2 and +4. The reaction conditions such as the concentration of nitric acid can influence which oxidation state tin attains. In the presence of concentrated nitric acid, tin is forced to the +4 oxidation state, resulting in compounds characteristic of tin(IV). Recognizing this tendency helps in predicting the nature of the products when tin is involved in redox reactions.

Hydrolysis of Metal Nitrates

Many metal nitrates, once formed in a reaction, are unstable and prone to hydrolysis in the presence of water. This process often leads to the formation of corresponding metal oxides or hydroxides rather than isolating the nitrate salt itself. Understanding this concept is important when assessing reactions where initially formed nitrates, such as those of tin, do not remain intact but instead transform into other compounds.

Metastannic Acid Formation

Metastannic acid is a hydrated form of tin(IV) oxide that typically forms from the hydrolysis of unstable tin(IV) nitrate. In reactions where tin is oxidized by concentrated nitric acid, even if a tin nitrate might briefly exist, it largely undergoes hydrolysis to yield metastannic acid. This conversion is a key point when predicting the actual, isolable product arising from the reaction of tin with concentrated nitric acid.

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