When a metal of group 1 was dissolved in liquid ammonia blue solution was obtained Why?

1 Answer. The blue colour of the solution is due to the presence of ammoniated electron which absorb energy in the visible region of light and thus, impart blue colour to the solution.

How do you account for the blue colour of the solution?

Account for the following: Blue coloured solutions are obtained when alkali metals are dissolved in liquid ammonia.

How do first group elements react with ammonia and give blue?

When alkali metals are dissolved in liquid ammonia they give blue colored conducting solution. This solution contain ammoniated electron which absorbs light in visible region and impart blue color to the solution. This solution is paramagnetic.

Why alkali metals impart colour to the flame?

Alkali metals have low ionization enthalpies. Their valence electrons easily absorb energy from the flame and are excited to higher levels. When these electrons return to the ground state, the energy is emitted in form of tight. Was this answer helpful?

How do you account for the strong reducing power of lithium in aqueous solution?

How do you account for the strong reducing power of lithium in aqueous solution? Li ions, due to small size, have high enthalpy of ionization and hydration. In aqueous solution, high hydration enthalpy predominates, and Li loses electrons and has strong reducing power.

Which of the following compounds does not exist in solid state normally?

LiHCO3 does not exist in solid state. This is because Li+ cation has highest hydration enthalpy. So, they do not exist in solid state.

Which of the following metal does not give flame test?

Beryllium cannot give flame test. Beryllium has small size. It strongly binds its electrons. Thus it has high ionization enthalpy.

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When a metal of Group 1 was dissolved in liquid ammonia The following observations were obtained?

When a metal of group I was dissolved in liquid ammonia, the following observations were obtained : (i) Blue solution was obtained initially. (ii) On concentrating the solution, the blue colour changed to bronze colour.

When a metal of Group I was dissolved in liquid ammonia The following observations were obtained?

When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained <br> (a) Blue solution was obtained initially. <br> On concentrating the solution, blue colour changed to bronze colour.

Why are lithium salts mostly hydrated?

Lithium is known to have the smallest size among all alkali metals. This is the primary reason why the Li+ ion has the ability to polarize water molecules more easily when compared to other alkali metals.

Why is sodium metal tarnished in air?

Why does sodium metal get tarnished in air? Answer – Sodium tarnish in air due to the formation of layer of sodium carbonate by the reaction with moist air.

When heated in air the alkali metals form various oxides?

1 Answer. The reactivity of alkali metals towards oxygen increases down the group as the atomic size increases. Thus, Li forms only lithium oxide (Li 2O), sodium forms mainly sodium peroxide (Na 2O 2) along with a small amount of sodium oxide while potassium forms only potassium superoxide (KO 2).

Why are alkali and alkaline earth metals not obtained by chemical reduction methods?

Alkali and alkaline earth metals have high reduction potentials. Hence, they are very strong reducing agents. Hence, other reducing agents cannot reduce oxides or other compounds of alkali and alkaline earth metals. Hence, chemical reduction is not possible.

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Which of the following elements occurs as a gas at room temperature?

Elemental hydrogen (H, element 1), nitrogen (N, element 7), oxygen (O, element 8), fluorine (F, element 9), and chlorine (Cl, element 17) are all gases at room temperature, and are found as diatomic molecules (H2, N2, O2, F2, Cl2).

When alkali metals are exposed to air gets tarnished in air?

When exposed to air, the alkali metals tarnish quickly. This is because, they react with oxygen, moisture and carbon dioxide present in air to form oxides, hydroxides and carbonates.

Which is responsible for blue colour solution of sodium in liquid ammonia?

Solution : The presence of ammoniated electron is responsible for the blue colour of the sodium of sodium in liquid ammonia.

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