English
Karnataka Board PUCPUC Science Class 11

Why Are Alkali Metals Not Found in Nature? - Chemistry

Advertisements
Advertisements

Question

Why are alkali metals not found in nature?

Short Note

Solution

Alkali metals include lithium, sodium, potassium, rubidium, cesium, and francium. These metals have only one electron in their valence shell, which they lose easily, owing to their low ionization energies. Therefore, alkali metals are highly reactive and are not found in nature in their elemental state.

shaalaa.com
Group 1 Elements - Alkali Metals
  Is there an error in this question or solution?
Chapter 10: The s-Block Elements - EXERCISES [Page 313]

APPEARS IN

NCERT Chemistry - Part 1 and 2 [English] Class 11
Chapter 10 The s-Block Elements
EXERCISES | Q 10.3 | Page 313

RELATED QUESTIONS

What are the common chemical features of alkali metals?


Why are potassium and cesium, rather than lithium used in photoelectric cells?


When an alkali metal dissolves in liquid ammonia the solution can acquire different colours. Explain the reasons for this type of colour change.


Write a balanced equation for the reaction between KO2 and water.


What are the common physical features of alkali metals?


The alkali metals are low melting. Which of the following alkali metal is expected to melt if the room temperature rises to 30°C?


The order of decreasing ionisation enthalpy in alkali metals is ______.


The solubility of metal halides depends on their nature, lattice enthalpy and hydration enthalpy of the individual ions. Amongst fluorides of alkali metals, the lowest solubility of LiF in water is due to ______.


In the synthesis of sodium carbonate, the recovery of ammonia is done by treating NH4Cl with Ca(OH)2. The by-product obtained in this process is ______.


Which of the following compounds are readily soluble in water?

(i) BeSO4

(ii) MgSO4

(iii) BaSO4

(iv) SrSO4 


When heated in air, the alkali metals form various oxides. Mention the oxides formed by Li, Na and K.


Write Lewis strucure of \[\ce{O^{-}2}\] ion and find out oxidation state of each oxygen atom? What is the average oxidation state of oxygen in this ion?


When a metal of group 1 was dissolved in liquid ammonia, the following observations were obtained:

(i) Blue solution was obtained initially.

(ii) On concentrating the solution, blue colour changed to bronze colour.

How do you account for the blue colour of the solution? Give the name of the product formed on keeping the solution for some time.


The stability of peroxide and superoxide of alkali metals increase as we go down the group. Explain giving reason.


The metal mainly used in devising photoelectric cells is ______.


The correct order of hydration enthapies of alkali metal ions is ______.


Nitrogen combines with metals to form ______.


KO2 (potassium super oxide) is used in oxygen cylinders in space and submarines because it ______.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×