s-Block Elements — JEE Main PYQs

Which of the following statements are correct?
(A) Both LiCl and ${\mathrm{MgCl}}_2$ are soluble in ethanol.
(B) The oxides ${\mathrm{Li}}_2\mathrm{O}$ and MgO combine with excess of oxygen to give superoxide.
(C) LiF is less soluble in water than other alkali metal fluoride …

Which one of the following elemental forms is not present in the enamel of the teeth?

In the industrial production of which of the following, molecular hydrogen is obtained as a byproduct?

Which one of the following compounds is used as a chemical in certain type of fire extinguishers?

Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution?

Number of amphoteric compounds among the following is ____.
(A) BeO
(B) BaO
(C) $\mathrm{Be}(\mathrm{OH}{)}_2$
(D) $\mathrm{Sr}(\mathrm{OH}{)}_2$

What are the products formed in sequence when excess of ${\mathrm{CO}}_2$ is passed in slaked lime?

The conversion of hydroxyapatite occurs due to presence of ${\mathrm{F}}^{-}$ions in water. The correct formula of hydroxyapatite is:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Barium carbonate is insoluble in water and is highly stable.
Reason (R): The thermal stability of the carbonates increases with increasing cationic size. Choos …

A s-block element (M) reacts with oxygen to form an oxide of the formula ${\mathrm{MO}}_2$. The oxide is pale yellow in colour and paramagnetic. The element ( M ) is:

Match List - I with List - II

List - I (salt)
(a) LiCl
(b) NaCl
(c) RbCl
(d) CsCl

List - II (Flame colour wavelength)
(i) 455.5 nm
(ii) 670.8 nm
(iii) 780.0 nm
(iv) 589.2 nm

Choose the correct answer from the options given below:

Choose the correct statement from the following :

Match List - I with List - II :

List - I (Elements)
(a) Ba
(b) Ca
(c) Li
(d) Na

List - II (Properties)
(i) Organic solvent soluble compounds
(ii) Outer electronic configuration $6{\mathrm{s}}^2$
(iii) Oxalate insoluble in water
(iv) Formation of very strong monoacidic base

C …

The number of water molecules in gypsum, dead burnt plaster and plaster of paris, respectively are:

Match List - I with List - II.

List - I
(a) Sodium Carbonate
(b) Titanium
(c) Chlorine
(d) Sodium hydroxide

List - II
(i) Deacon
(ii) Castner-Kellner
(iii) van-Arkel
(iv) Solvay

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) : Lithium salts are hydrated.
Reason (R) : Lithium has higher polarising power than other alkali metal group members.
In the light of the above statements, cho …

Match List-I with List-II:

List - I
(a) NaOH
(b) $\mathrm{Be}(\mathrm{OH}{)}_2$
(c) $\mathrm{Ca}(\mathrm{OH}{)}_2$
(d) $\mathrm{B}(\mathrm{OH}{)}_3$
(e) $\mathrm{Al}(\mathrm{OH}{)}_3$

List - II
(i) Acidic
(ii) Basic
(iii) Amphoteric

Choose the most appropriate answer f …

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion R: Lithium halides are some what covalent is nature.
Reason R: Lithium possess high polarisation capability.
In the light of the above statements, choose the most appro …

Given below are two statements:
Statement I: None of the alkaline earth metal hydroxides dissolves in alkali.
Statement II: Solubility of alkaline earth metal hydroxides in water increases down the group.
In the light of the above statements, choose the most appropriate answer fr …

Match List - I with List - II:

List - I
(a) Li
(b) Na
(c) K
(d) Cs

List - II
(i) photoelectric cell
(ii) absorbent of ${\mathrm{CO}}_2$
(iii) coolant in fast breeder nuclear reactor
(iv) treatment of cancer
(v) bearings for motor engines

Choose the correct answer from the opti …

Number of paramagnetic oxides among the following given oxides is ______.
${\mathrm{Li}}_2\mathrm{O},\mathrm{CaO},{\mathrm{Na}}_2{\mathrm{O}}_2,{\mathrm{KO}}_2,\mathrm{MgO}$ and ${\mathrm{K}}_2\mathrm{O}$

Given below are two statements:
Statement I: Both CaCl₂·6H₂O and MgCl₂·8H₂O undergo dehydration on heating.
Statement II: BeO is amphoteric whereas the oxides of other elements in the same group are acidic.
In the light of the above statements, choose the correct answer from the …

One of the by-products formed during the recovery of ${\mathrm{NH}}_3$ from solvay process is:

Match List - I with List - II:

List - I:
(a) $\mathrm{Ca}(\mathrm{OCl}{)}_2$
(b) ${\mathrm{CaSO}}_4\cdot \frac{1}{2}{\mathrm{H}}_2\mathrm{O}$
(c) CaO
(d) ${\mathrm{CaCO}}_3$

List - II:
(i) Antacid
(ii) Cement
(iii) Bleach
(iv) Plaster of Paris

Choose the most appropriate answer from …

Match List - I with List - II:
List - I (Elements): (a) Li (b) Na (c) K (d) Cs
List - II (Properties): (i) Poor water solubility of I⁻ salt (ii) Most abundant element in cell fluid (iii) Bicarbonate salt used in fire extinguisher (iv) Carbonate salt decomposes easily on h …

Match List - I with List - II:
List - I: (a) Be (b) Mg (c) Ca (d) Ra
List - II: (i) Treatment of cancer (ii) Extraction of metals (iii) Incendiary bombs and signals (iv) Windows of X-ray tubes (v) Bearings for motor engines.
Choose the most appropriate answer from the o …

When gypsum is heated to 393 K , it forms :

A metal (A) on heating in nitrogen gas gives compound B. B on treatment with ${\mathrm{H}}_2\mathrm{O}$ gives a colourless gas which when passed through ${\mathrm{CuSO}}_4$ solution gives a dark blue-violet coloured solution. A and B respectively, are:

Among the statements (a) - (d), the correct ones are:
(a)Lithium has the highest hydration enthalpy among the alkali metals.
(b) Lithium chloride is insoluble in pyridine.
(c) Lithium cannot form ethynide upon its reaction with ethyne
(d) Both lithium and magnesium react slowly w …

Match the following compounds (Column-I) with their uses (Column-II):
S.
No
Column-I
S.
No.
Column-II
No.
(i) $\mathrm{Ca}(\mathrm{OH}{)}_2$
(A) casts of statues
(ii) $\mathrm{NaCl}$
(B) white wash
(iii) ${\mathrm{CaSO}}_4\cdot \frac{1}{2}{\mathrm{H}}_2\mathrm{O}$
(C) an …

Among the sulphates of alkaline earth metals, the solubilities of ${\mathrm{BeSO}}_4$ and ${\mathrm{MgSO}}_4$ in water, respectively, are:

On combustion of $\mathrm{Li},\mathrm{Na}$ and K in excess of air, the major oxides formed, respectively, are:

An alkaline earth metal ' M ' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. M is:

The correct order of hydration enthalpies of alkali metal ions is:

The covalent alkaline earth metal halide
( $\mathrm{X}=\mathrm{Cl},\mathrm{Br},\mathrm{I}$ ) is:

Magnesium powder burns in air to give:

The metal used for making X-ray tube window is

Match the following items in column I with the corresponding items in column II.

Column I
I. ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$
II. $\mathrm{Mg}{\left({\mathrm{HCO}}_3\right)}_2$
III. NaOH
IV. ${\mathrm{Ca}}_3{\mathrm{Al}}_2{\mathrm{O}}_6$

Column …

The correct sequence of thermal stability of the following carbonates is :

A hydrated solid X on heating initially gives a monohydrated compound Y . Y upon heating above 373 K leads to an anhydrous white powder $\mathrm{Z}.\mathrm{X}$ and Z , respectively, are:

The amphoteric hydroxide is:

A metal on combustion in excess air forms $\mathrm{X}$, $\mathrm{X}$ upon hydrolysis with water yields ${\mathrm{H}}_2{\mathrm{O}}_2$ and ${\mathrm{O}}_2$ along with another product. The metal is:

The INCORRECT statement is:

The correct statement(s) among I to III with respect to potassium ions that are abundant within the cell fluids is/are :
I. They activate many enzymes
II. They participate in the oxidation of glucose to produce ATP
III. Along with sodium ions, they are responsible for the transmi …

The structures of beryllium chloride in the solid state and vapour, phase, respectively, are:

The metal that forms nitride by reacting directly with ${\mathrm{N}}_2$ of air is

The alkaline earth metal nitrate that does not crystallise with water molecules is

The alloy used in the construction of aircrafts is

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting $\left[3{\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2\cdot \mathrm{Ca}(\mathrm{OH}{)}_2\right]$ to :

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :