This is because nitric acid is a strong oxidising agent, and oxidises hydrogen gas to convert it into the water.

So, metals in the intermediate region like magnesium that react with hot water to liberate hydrogen gas is the best one for the preparation of hydrogen from water.

Iron and aluminium react with dilute acids to form hydrogen and their respective salts. d)Sodium again having a very uncontrollable reaction withe dilute acids cant be used as the exothermic reaction sets the hydrogen burning.

Nitric acid can not be used to prepare hydrogen by its action on active metals.

Ammonia

So as soon as hydrogen gas is formed in the reaction between a metal like zinc and dilute nitric acid, the nitric acid oxidizes the hydrogen gas to water and itself get reduced to any of nitrogen oxides. Thus , this explains why nitric acid does not release hydrogen gas upon reaction with metals.

HNO₃

Answer: Hydrogen gas is not evolved when a metal reacts with nitric acid because nitric acid is a strong oxidizing agent; it oxidizes the hydrogen to produce water. When a metal reacts with nitric acid, no hydrogen gas is produced.

No, nitric acid is a powerful oxidising agent. In nitric acid (HNO3), nitrogen is in its maximum oxidation state of +5, and it cannot be oxidised further to any higher state. So, it cannot act as a reducing agent.

The oxidation state of an atom is an important factor in deciding whether the element will work as an oxidation agent or reducing agent. In the case of Nitric acid (HNO3), the nitrogen has a +5 oxidation state, which is its highest oxidation state, so it will get reduced and oxidize other molecules.

Common reducing agents include metals potassium, calcium, barium, sodium and magnesium, and also compounds that contain the H− ion, those being NaH, LiH, LiAlH4 and CaH2. Hydrogen gas is a reducing agent when it reacts with non-metals and an oxidizing agent when it reacts with metals.

Potassium permanganate

Potassium Permanganate

Potassium permanganate acts as a disinfectant- Because of its oxidizing property, it can act as a disinfectant to treat skin infections such as dermatitis, canker sores, ulcers, eczema and fungal infections.

The colour of KMnO4 is due to transitions of charge transfer by the absorption of visible light. Metal ions possess the electron in KMnO4 and thus the transition of charge takes place from O to Mn+.

It has been known that potassium permanganate (KMnO4) solution is one such effective disinfectant, and many researchers used it against a wide range of microorganisms.

Potassium permanganate and manganese dioxide Potassium permanganate is a weak oxidizer when compared with chlorine, chlorine dioxide and ozone. It is low in effectiveness in relation to algae metabolites such as IPMP, IBMP, MIB, TCA, Geosmin.

To achieve an appropriate dilution using potassium permanganate 0.1% solution, combine 1 part potassium permanganate with 10 parts hot water. Undiluted potassium permanganate has a striking purple color, but a diluted solution should be pink.

With our new PERISTAL BLI ECO system we are offering you an environmentally friendly alternative to potassium permanganate for the spray bleach of indigo-dyed denim jeans. The PERISTAL BLI ECO products are free of chlorine and heavy metals and comply to various ecological standards like ZDHC and bluesign®.

Potassium permanganate is available as a dry, purplish solid. A device injects a solution of potassium permanganate into the water between the water pump and holding tank. Potassium permanganate oxidizes iron, manganese, and hydrogen sulfide into particles. The water should be colorless when it leaves the filter.

The price of 44% Potassium Permanganate products is between ₹160 – ₹190 per Kg.

Can I buy potassium permanganate over the counter? Yes, you can purchase purple tablets of potassium permanganate as an over-the-counter remedy at your local drugstore.

When you add the potassium permanganate, it reacts with the hydrogen peroxide to produce oxygen in small “pockets”. These pockets of oxygen increase the intensity of the reaction and you get the cannon fire noise as the pockets of oxygen hit the flame. Potassium gives a violet flame colour.

You are advised to a Sitz bath every day, that is, sitting in a tub of warm water with potassium permanganate added to it for 20 minutes 2-3 times a day to keep the area clean and for relief from pain. You may experience pain, discomfort and a slight watery discharge from the operated site for 7-10 days.