Sodium forms ${\rm{N}}{{\rm{a}}^ + }$ and not ${\rm{N}}{{\rm{a}}^{2 + }}$ because:

First ionization potential is small and the difference in first and second ionization potentials is very large

Radius of ${\rm{N}}{{\rm{a}}^ + }$ is much smaller than of ${\rm{N}}{{\rm{a}}^ + }$

Back to S-BLOCK ELEMENTS

Your Progress

0 / 38 Answered

Correct

Incorrect

Accuracy

NEET • CHEMISTRY • S-BLOCK ELEMENTS

S-block elements practice · Easy

Choose an answer to check it, or open “View answer” to study the explanation. Sign in to save progress to your account.

Practice format and chapter quiz

The practice player uses single-correct-answer MCQs. Chapter quizzes help you review a topic; they are not full-length NEET mock papers.

Take a chapter quiz →

Showing 31-38 of 38 questions

Preparing practice and saved progress…

31 Easy

31 of 38

Understanding +4 | -1

Which of the following hydride conducts electricity in molten state

View answer and explanation

Correct option: D

The correct answer is D (KH) because Potassium hydride (KH) is an ionic hydride, and in the molten state, it dissociates into ions that can conduct electricity.

32 Easy

32 of 38

Remembering +4 | -1

Which component of cement sets at the slowest rate?

View answer and explanation

Correct option: A

Dicalcium silicate

Dicalcium silicate (Option A) sets at the slowest rate in cement hydration due to its lower reactivity compared to other cement components.

33 Easy

33 of 38

Analyzing +4 | -1

Incorrect statement among the following is

View answer and explanation

Correct option: A

Density of lithium is more than sodium

Option A (Density of lithium is more than sodium) is correct because lithium has a lower density than sodium due to its smaller size and weaker metallic bonding.

34 Easy

34 of 38

Understanding +4 | -1

\mathrm{K}{\mathrm{O}_2}

is used in oxygen cylinder in space air craft and submarines because it:

View answer and explanation

Correct option: A

Absorbs

\mathrm{C}{\mathrm{O}_2}

and increase

{\mathrm{O}_2}

content

Option A (Absorbs

\mathrm{C}{\mathrm{O}_2}

and increase

{\mathrm{O}_2}

content) is correct because potassium superoxide reacts with carbon dioxide to produce oxygen, thereby purifying the air.

35 Easy

35 of 38

Analyzing +4 | -1

Which of the alkali metal chloride is expected to have highest m.p.?

View answer and explanation

Correct option: A

\mathrm{LiCl}

Option A (LiCl) is correct because, contrary to the general trend, LiCl has the highest melting point due to its more covalent character and smaller size, leading to stronger interactions.

36 Easy

36 of 38

Remembering +4 | -1

When sodium is heated in flame it gives:

View answer and explanation

Correct option: A

Golden yellow colour

Option A (Golden yellow colour) is correct because when sodium is heated in a flame, it emits light with a golden yellow color.

37 Easy

37 of 38

Remembering +4 | -1

Scarlet flame colour of Bunsen flame is characteristic of:

View answer and explanation

Correct option: D

\mathrm{Sr}

Strontium (Option D) produces a characteristic scarlet red flame in the Bunsen flame test.

38 Easy

38 of 38

Understanding +4 | -1

Sodium forms

\mathrm{N}{\mathrm{a}^ + }

and not

\mathrm{N}{\mathrm{a}^{2 + }}

because:

View answer and explanation

Correct option: A

Sodium contains only one electron in outermost shell

Option A is correct because sodium readily loses its single valence electron to achieve a stable octet configuration, making the formation of

\mathrm{Na}^{2+}

energetically unfavorable.

Revision notes and key takeaways

Review S-BLOCK ELEMENTS in your textbook or class notes, then use this set to check your understanding.

Showing 31-38 of 38 questions

Your Progress

S-block elements practice · Easy

Continue Your Practice

Your practice