SATHEE: The sBlock Elements - Result Question 4

The sBlock Elements - Result Question 4

####4. Which one of the alkali metals, forms only, the normal oxide, $M_{2} O$ on heating in air?

(a) $R b$

(b) $K$

(d) $N a$

[2012]

Show Answer

Solution:

(c) All the alkali metals when heated with oxygen form different types of oxides for example lithium forms lithium oxide $(L i_{2} O)$ , sodium forms sodium peroxide $(N a_{2} O_{2})$ , while $K, R b$ and $C s$ form their respective superoxides.

$L i^{+}$ being smallest, combines with small anion $O^{2 -}$ to form stable $L i_{2} O$ .

The $N a^{+}$ being relatively larger than $L i^{+}$ and weaker positive field than $L i^{+}$ , combines with $O_{2}^{2 -}$ (peroxide ion) to form $N a_{2}, O_{2} \cdot K^{+}, R b^{+}$ and $C s^{+}$ being relative larger than $N a^{+}$ and with weaker positive field than $N a^{+}$ combines with $O_{2}^{-}$ (superoxide ion) to for $K O_{2}, R b O_{2}$ and $C s O_{2}$ respectively.

Play Store

App Store

Ask SATHEE

Welcome to SATHEE !
Select from 'Menu' to explore our services, or ask SATHEE to get started. Let's embark on this journey of growth together! 🌐📚🚀🎓

I'm relatively new and can sometimes make mistakes.
If you notice any error, such as an incorrect solution, please use the thumbs down icon to aid my learning.
To begin your journey now, click on "I understand".

The sBlock Elements - Result Question 4

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

Menu