Petrol does not react with sodium or potassium. But it is not selected for preserving sodium or potassium metals.

When sodium is added to water, the sodium melts to form a ball that moves around on the surface. It fizzes rapidly, and the hydrogen produced may burn with an orange flame before the sodium disappears.

For decades, science enthusiasts have delighted at the famously energetic way sodium and potassium explode on contact with water. They recognized that the steam and hydrogen generated early on in the reaction should form a buffer layer over the metal surface and impede water from continuing to react.

The classic explanation of elemental sodium’s volatile reaction with water involves the simple reduction-oxidation chemistry of sodium and water: electrons flow from sodium metal into the surrounding water, forming sodium hydroxide and hydrogen gas. This is a very fast reaction that produces a lot of heat.

Sodium can not be stored in water because Reaction of sodium and water is highly exothermic. During this reaction hydrogen gas is produces which catches fire due to heat released during reaction.

Sodium and potassium are stored in kerosene. Sodium and potassium are very reactive metals and readily catches fire in the air. They cannot be kept in water as they react exothermically in water.

Explanation: Sodium and potassium metals reacts very vigorously with water; this reaction gives out so much heat that the hydrogen evolved catches fire. Therefore, these metals are stored under kerosene.

Answer. when sodium and potassium are kept in open they both will react violently with atmosphere gas and it will catches fire so that’s y. this both metal are must kept in kerosene oil because they are highly reactive metal.

Sodium is a very high reactive metal. when is it kept in open sodium reacts with oxygen in the air at room temperature, to form, sodium oxide. Therefore it catches fire and starts burning when kept in open in the air.

Answer: Sodium and potassium are highly reactive metals and react vigorously with oxygen present in the air such that it may even catch fire. Sodium does not react with kerosene; this is the reason for preserving sodium in kerosene.

It is significantly more reactive in air as a liquid than as a solid, and the liquid can ignite at about 125 °C (257 °F). In a comparatively dry atmosphere, sodium burns quietly, giving off a dense white caustic smoke, which can cause choking and coughing.

Sodium

Answered on 24th Nov, 2020. a) Metal M is Sodium (Na), which is used as a coolant in nuclear reactors. b) Solution S is a Sodium hydroxide (NaOH solution). It is alkaline in nature, turns red litmus to blue. c) Gas G is Hydrogen gas (H2), which is lighter than air.

Hydrogen

So when the gases in the air are measured against hydrogen, the latter becomes lighter. Therefore, Hydrogen is 14 times lighter than Air.

Hydrogen. Hydrogen ignites in air. If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop.

A gas evolution reaction is a chemical reaction in which one of the end products is a gas such as oxygen or carbon dioxide. Gas evolution reactions may be carried out in a fume chamber when the gases produced are poisonous when inhaled or explosive.