English
Karnataka Board PUCPUC Science Class 11

Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?

Advertisements
Advertisements

Question

Explain why alkali and alkaline earth metals cannot be obtained by chemical reduction methods?

Answer in Brief
Advertisements

Solution

In the process of chemical reduction, oxides of metals are reduced using a stronger reducing agent. Alkali metals and alkaline earth metals are among the strongest reducing agents and the reducing agents that are stronger than them are not available. Therefore, they cannot be obtained by chemical reduction of their oxides.

shaalaa.com
  Is there an error in this question or solution?

RELATED QUESTIONS

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


Write a balanced equation for the reaction between Na2O and CO2.


Which of the following statements is incorrect?


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?


Alkali metals react with water vigorously to form hydroxides and dihydrogen. Which of the following alkali metals reacts with water least vigorously?


Metals form basic hydroxides. Which of the following metal hydroxide is the least basic?


Which of the following elements does not form hydride by direct heating with dihydrogen?


Metallic elements are described by their standard electrode potential, fusion enthalpy, atomic size, etc. The alkali metals are characterised by which of the following properties?

(i) High boiling point.

(ii) High negative standard electrode potential.

(iii) High density.

(iv) Large atomic size.


Choose the correct statements from the following.

(i) Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal.

(ii) Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of Be2+ overcomes the lattice enthalpy factor.

(iii) Beryllium exhibits coordination number more than four.

(iv) Beryllium oxide is purely acidic in nature.


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?


Ions of an element of group 1 participate in the transmission of nerve signals and transport of sugars and aminoacids into cells. This element imparts yellow colour to the flame in flame test and forms an oxide and a peroxide with oxygen. Identify the element and write chemical reaction to show the formation of its peroxide. Why does the element impart colour to the flame?


The metal mainly used in devising photoelectric cells is ______.


Nitrogen combines with metals to form ______.


Given below are two statements, one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Lithium salts are hydrated.

Reason (R) : Lithium has higher polarising power than other alkali metal group members.

In the light of the above statements, choose the most appropriate answer from the options given below :


The correct order of conductivity of ions in water is ______.


Alkali metals are powerful reducing agents because ______.


Which element from following is used as moderator in nuclear reactor?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×