Blog Log in Get Started Free

Classification of elements and Periodicity in properties MCQs for NEET — Chemistry Questions with Answers

Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

All Physics Chemistry Botany Zoology

Language English हिंदी

Chapter Difficulty Show only questions I answered incorrectly Clear Register free for difficulty & keyword filters

● ● ● ● ●

In the reaction $M + O_{2} \to M O_{2}$ (super oxide) the metal is -

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

● ● ● ● ●

The reaction of sodium with water is highly exothermic. The rate of reaction can be lowered by-

Decreasing the temperature

Mixing with alcohol

Mixing with acetic acid

Making an amalgam

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(D) Sodium amalgam is less reactive than sodium metal.

● ● ● ● ●

Pearl ash and caustic potash are chemically-

$K_{2} C O_{3}$ and KOH

KOH and $K_{2} C O_{3}$

$N a_{2} C O_{3}$ and KOH

$N a_{2} C O_{3}$ and NaOH

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(A) Pearl ash is $K_{2} C O_{3}$ ; caustic potash is KOH.

● ● ● ● ●

Sodium reacts with water less vigorously than potassium because-

It has higher atomic weight

It is less electropositive

It is more electronegative

It is a metal

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(B) The reactivity of alkali metals increases down the groups.

● ● ● ● ●

The density of-

Na > K

Na = K

K > Na

Li > K

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(A). The densities of elements of group 1 are quite low (Li = 0.534 g/cc, Na = 0.972, K = 0.559, Rb = 1.53, Cs = 1.903).
It increases gradually in moving from Li to Cs. However potassium is lighter than sodium probably due to an unusual increase in atomic size of potassium.

● ● ● ● ●

Which of the following is amphoteric –

$B e {(O H)}_{2}$

$C a {(O H)}_{2}$

$S r {(O H)}_{2}$

$B a {(O H)}_{2}$

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(A) $B e {(O H)}_{2}$ reacts with both acid and bases or dissolves in acids as well as in alkalies.

● ● ● ● ●

The reason for the lower basicity of alkaline earth metals than alkali metals is.

Alkali metals form ionic compounds

The bond of oxygen is more for alkali metals

The electropositivity of alkali metals is more than alkaline earth metals

The electropositivity of alkali metals is less than alkaline earth metals

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(C). Because alkali metals are more electropositive than alkaline earth metals.

● ● ● ● ●

In $K^{+} F^{-}$ ionic radius of $F^{-}$ is more while atomic radius of $K^{+}$ is –

Less than $F^{-}$

More than $F^{-}$

Equal to $F^{-}$

None of these

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(B). Alkali metals have the largest atomic sizes in their corresponding periods.K⁺ = 138 pm,

F^{- _{133 pm}}

● ● ● ● ●

MgO is a-

Acidic oxide

Basic oxide

Neutral oxide

Amphoteric oxide

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(B). It is a basic oxide and hence reacts with acids to form salts.

$M g O + 2 H C l \to M g C l_{2} + H_{2} O$

● ● ● ● ●

Which of the following statements is wrong ?

Lithium nitrate on heating gives lithium nitrite and $O_{2}$ .

Sodium oxide, $N a_{2} O$ is obtained on heating sodium azide with sodium nitrite.

Potassium cyanide dissolves silver in presence of air or $O_{2}$ .

Potassium formate is formed when moist $C O_{2}$ reacts with potassium hydride.

You've reached today's free limit of 20 questions. Log in to keep practising for free.

Explanation

(A). $4 L i N O_{3} \to 2 L i_{2} O + 4 N O_{2} + O_{2}$

Ready to ace NEET?

Free access · No credit card required

Browse All Questions Create Free Account

Frequently Asked Questions

Yes. You can attempt every Classification of elements and Periodicity in properties question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.