s-Block Elements — JEE Main PYQs

The type of oxide formed by the element among $\mathrm{Li},\mathrm{Na},\mathrm{Be},\mathrm{Mg},\mathrm{B}$ and Al that has the least atomic radius is :

The ${\mathrm{F}}^{-}$ions make the enamel on teeth much harder by converting hydroxyapatite (the enamel on the surface of teeth) into much harder fluoroapatite having the formula.

Number of metal ions characterized by flame test among the following is ____.
${\mathrm{Sr}}^{2+},{\mathrm{Ba}}^{2+},{\mathrm{Ca}}^{2+},{\mathrm{Cu}}^{2+},{\mathrm{Zn}}^{2+},{\mathrm{Co}}^{2+},{\mathrm{Fe}}^{2+}$

The setting time of Cement is increased by adding

Ion having highest hydration enthalpy among the given alkaline earth metal ions is:-

Structure of ${\mathrm{BeCl}}_2$ in solid state, vapour phase and at very high temperature respectively are :-

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R
Assertion A :- Sodium is about 30 times as abundant as potassium in the oceans.
Reason R :- Potassium is bigger in size than sodium.
In the light of above statements, choose the …

For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si}$, $\mathrm{Al}$ and Fe should be as close as to :

Number of water molecules in washing soda and soda ash respectively are:

What is the purpose of adding gypsum to cement?

Given below are two statements:
Statement I: Lithium and Magnesium do not form superoxide
Statement II: The ionic radius of ${\mathrm{Li}}^{+}$ is larger than ionic radius of ${\mathrm{Mg}}^{2+}$
In the light of the above statements, choose the most appropriate answer from the option …

Lime reacts exothermally with water to give 'A' which has low solubility in water. Aqueous solution of 'A' is often used for the test of ${\mathrm{CO}}_2$, a test in which insoluble B is formed. If B is further reacted with ${\mathrm{CO}}_2$ then soluble compound is formed 'A' is

The compound which does not exist is

Alkali metal from the following with least melting point is :

$\mathrm{Mg}{\left({\mathrm{NO}}_3\right)}_2\cdot {\mathrm{XH}}_2\mathrm{O}$ and $\mathrm{Ba}{\left({\mathrm{NO}}_3\right)}_2\cdot {\mathrm{YH}}_2\mathrm{O}$, represent formula of the crystalline forms of nitrate salts. Sum of X and Y is ____

The density of alkali metals is in the order

In the given reaction cycle
${\mathrm{CaCl}}_2+{\mathrm{Na}}_2{\mathrm{CO}}_3⟶\underline{\mathrm{X}}+\underline{\mathrm{Y}}$
$\mathrm{X},\mathrm{Y}$ and Z respectively are

$\mathrm{Be}(\mathrm{OH}{)}_2$ react with $\mathrm{Sr}(\mathrm{OH}{)}_2$ to yield an ionic salt. Choose the incorrect option related to this reaction from the following:

Better method for preparation of ${\mathrm{BeF}}_2$, among the following is

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :

Assertion (A) : ${\mathrm{BeCl}}_2$ and ${\mathrm{MgCl}}_2$ produce characteristic flame.

Reason (R) : The excitation energy is high in ${\mathrm{BeCl}}_2$ and …

For a good quality cement, the ratio of silica to alumina is found to be

Choose the correct statement(s):
(A) Beryllium oxide is purely acidic in nature.
(B) Beryllium carbonate is kept in the atmosphere of ${\mathrm{CO}}_2$.
(C) Beryllium sulphate is readily soluble in water.
(D) Beryllium shows anomalous behavior.

Choose the correct answer from t …

Reaction of BeO with ammonia and hydrogen fluoride gives 'A' which on thermal decomposition gives ${\mathrm{BeF}}_2$ and ${\mathrm{NH}}_4\mathrm{F}$. What is 'A' ?

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Beryllium has less negative value of reduction potential compared to the other alkaline earth metals.
Reason R : Beryllium has large hydration energy due to small s …

Identify the correct statements about alkali metals.
A. The order of standard reduction potential $\left({\mathrm{M}}^{+}\mid \mathrm{M}\right)$ for alkali metal ions is $\mathrm{Na}>\mathrm{Rb}>\mathrm{Li}$.
B. CsI is highly soluble in water.
C. Lithium carbonate is highly st …

Match List I with List II

List I: Elements
List II: Colour imparted to the flame

Choose the correct answer from the options given below:

Compound A reacts with ${\mathrm{NH}}_4\mathrm{Cl}$ and forms a compound B . Compound B reacts with ${\mathrm{H}}_2\mathrm{O}$ and excess of ${\mathrm{CO}}_2$ to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. C …

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

Assertion A :- The alkali metals and their salts impart characteristic colour to reducing flame.

Reason R :- Alkali metals can be detected using flame tests.

In the light of th …

The magnetic behaviour of ${\mathrm{Li}}_2\mathrm{O}$, ${\mathrm{Na}}_2{\mathrm{O}}_2$ and ${\mathrm{KO}}_2$, respectively, are

On heating, ${\mathrm{LiNO}}_3$ gives how many compounds among the following?
${\mathrm{Li}}_2\mathrm{O},{\mathrm{N}}_2,{\mathrm{O}}_2,{\mathrm{LiNO}}_2,{\mathrm{NO}}_2$

The alkaline earth metal sulphate(s) which are readily soluble in water is/are:
(A) ${\mathrm{BeSO}}_4$
(B) ${\mathrm{MgSO}}_4$
(C) ${\mathrm{CaSO}}_4$
(D) ${\mathrm{SrSO}}_4$
(E) ${\mathrm{BaSO}}_4$

Choose the correct answer from the options given below:

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Gypsum is used for making fireproof wall boards.
Reason (R) : Gypsum is unstable at high temperatures.
In the light of the above statements, choose the corre …

The element playing significant role in neuromuscular function and interneuronal transmission is :

The number of alkali metal(s), from $\mathrm{Li},\mathrm{K},\mathrm{Cs},\mathrm{Rb}$ having ionization enthalpy greater than $400\mathrm{kJ}{\mathrm{mol}}^{-1}$ and forming stable super oxide is ____.

Portland cement contains ' X ' to enhance the setting time. What is ' X '?

Which of the following statement is incorrect ?

Statement I: An alloy of lithium and magnesium is used to make aircraft plates.

Statement II : The magnesium ions are important for cell-membrane integrity.

In the light the above statements, choose the correct answer from the options given below

Given below are two statements:

Statement I: The chlorides of Be and Al have Cl-bridged structure. Both are soluble in organic solvents and act as Lewis bases.

Statement II: Hydroxides of Be and Al dissolve in excess alkali to give beryllate and aluminate ions.

In the light of …

Choose the correct order of density of the alkali metals :

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : LiF is sparingly soluble in water.
Reason R : The ionic radius of ${\mathrm{Li}}^{+}$ ion is smallest among its group members, hence has least hydration enthalpy.
In …

The correct order of density is

Reaction of BeCl₂ with LiAlH₄ gives:
(A) AlCl₃
(B) BeH₂
(C) LiH
(D) LiCl
(E) BeAlH₄

Choose the correct answer from options given below:

Among the following basic oxide is :

BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of Be in [A] is ____

Amongst baking soda, caustic soda and washing soda carbonate anion is present in:

s-block element which cannot be qualitatively confirmed by the flame test is

The correct order of melting point is :

Addition of ${\mathrm{H}}_2{\mathrm{SO}}_4$ to ${\mathrm{BaO}}_2$ produces:

${\mathrm{BeCl}}_2$ reacts with ${\mathrm{LiAlH}}_4$ to give

Lithium nitrate and sodium nitrate, when heated separately, respectively, give :