The oxidation number of oxygen in ${\mathrm{Na}}_2{\mathrm{O}}_2$ is

Important Questions on The s-block Elements

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 19

Which of the following carbonates decomposes at lowest temperature?

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 20

Among $\mathrm{LiCl}, \mathrm{RbCl}, {\mathrm{BeCl}}_2$ and ${\mathrm{MgCl}}_2$ the compound with greatest and least ionic character respectively are _______.

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 21

Which is amphoteric?

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 22

For which element crimson colour is obtained in the flame test?
 

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 23

The metal that shows photoelectric emission at lowest frequency radiation is:
 

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 24

Write atomic number difference between $1^{\mathrm{st}}$ alkali metal and alkaline earth metal of $3^{\mathrm{rd}}$period of periodic table. 

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 25

The number of moles of water required to completely hydrolyse $1$$mole$ of magnesium nitride is ---------.

EASY

JEE Main

IMPORTANT

Chemistry Crash Course JEE Main>Chapter 29 - The s-block Elements>Level 2>Q 26

The main oxide formed by lithium on burning in air is $L{i}_x{O}_Y$. The value of $\frac{x}{y}$ is --------.