mixture of calcium cyanamide and carbon

mixture of calcium carbide and nitrogen

mixture of calcium cyanide and carbon

mixture of $$NH_4 CN$$ and $$CaCN$$

MCQ Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 10

Alkaline earth metals are better reducing agents than alkali metals.

0%
True
0%
False

Berylium resembles aluminum closely in its properties though it belongs to a different group.

0%
True
0%
False

The solubility in water of sulphates down the Be group is

$be > Mg > Ca >Sr > Ba$ This is due to

0%
Increase in melting point
0%
High ionization energy
0%
Higher coordination number
0%
All of those

Arrange the following elements in the increasing order of their atomic radii:

0%
$Na < Li < Rb < C < K$
0%
$Cs < Rb < K < Na < Li$
0%
$K < Rb < Cs < Na < Li$
0%
$Li < Na < K < Rb < Cs$

The fuel in the atomic pile is:

0%
thorium
0%
sodium
0%
petroleum
0%
uranium

Alkali metals and alkaline earth metals have the characteristics of :

0%
high melting points
0%
very high oxidation potentials
0%
solubility in liquid ammonia
0%
all of the above

Explanation

Alkali metals and alkaline earth metals have low melting points.

They have very high oxidation potentials.

They readily lose electrons and are strong reducing agents.
They have very good solubility in liquid ammonia.

So, both options

$B$ and

$C$ are correct.

Which of the following statement is incorrect?

0%
Across a period, the trend of radius and ionisation energy are generally opposite to each other.
0%
The metallic radius of potassium is greater than its covalent radius.
0%
Amongst $Li^{-},\:Be^{-},\:B^{-}$ and $C^{-},\: Li^{-}$ is least stable ion.
0%
Atomic and ionic radii of niobium and tantalum are almost same.

Explanation

(A) Across the period, size decreases as electrons are added in the same shell and nuclear charge increases by one unit for addition of each successive element. On the contrary, the ionization energy increases as size of atom decreases and nuclear charge increases.
(B)

$r_{metallic} > r_{covalent}$ as covalent bond formation involves the overlapping of orbitals. In potassium,

$r_{metallic} = 235\ pm$ while,

$r_{covalent} = 203\ pm$ .
(C)

$Li^- : 1s^2 2s^2$ ; completely filled stable configuration, so more stable.

$Be^-: 1s^2 2s^2 2p^1$

$B^- : 1s^2 2s^2 2p^2$

$C^- : 1s^2 2s^2 2p^3$ ; half filled stable configuration
(D) Due to lanthanide contraction.

Which of the following will have the largest size in water?

0%
$Rb^{+}$
0%
$Na^{+}$
0%
$K^{+}$
0%
$Li^{+}$

Explanation

Among the given ions,

$Li^+$ ion has the maximum charge density due to its small ionic size. Hence, it undergoes hydration to maximum extent. Thus, the size of hydrated

$Li^+$ ion is the maximum among the given ions.
Small size has high hydration energy.

The solubility of II group hydroxides increases with molecular weight. This is because:

0%
lattice energy is same but hydration energy decreases down the group.
0%
hydration energy is same but lattice energy decreases down the group.
0%
both lattice and hydration energy increase down the group.
0%
decrease in lattice energy down the group is faster than decrease in hydration energy.

Explanation

On moving down the group II, the atomic and ionic size increases. The size of

$Be^{2+}$ is smallest and the size of

$Ba^{2+}$ is highest. As the size increases, the decrease in the lattice energy is much more than the decrease in the hydration energy. Due to this, the solubility increases with increase in the molecular weight on moving down the group.

Hence, barium hydroxide is more soluble than beryllium hydroxide.

A substance which gives brick red colour in flame test and breaks down on heating to give oxygen and a brown gas is :

0%
magnesium nitrate
0%
calcium nitrate
0%
barium nitrate
0%
strontium nitrate

Explanation

Calcium nitrate gives brick red colour in flame test and breaks down on heating to give oxygen and a brown gas (

$NO_2$ ).

Which of the following statement(s) is/are true?

0%
Both $LiCl$ and $MgCl_{2}$ are deliquescent.
0%
Lithium is least reactive but the strongest reducing agent amongst all the alkali metals.
0%
Liquid sodium metal is used as a coolant in fast breeder nuclear reactors.
0%
Lithium iodide is the most ionic in nature among all alkali metal halides.

Explanation

(A)

$Li^{+}$ and

$Mg^{2+}$ have higher polarising power and thus attract more number of water molecules.
(B)

$Li$ is least reactive because of its highest ionisation energy on account of smaller size.
(C) It is one of the uses of liquid sodium as it has low melting point.
(D)

$LiI$ is the most covalent due to smaller cation and bigger anion (according to Fajan's rule).

The highest reducing power in aqueous medium of lithium among other alkali metals is due to:

0%
very small size of lithium atom
0%
very low sublimation energy of lithium
0%
the lowest ionization energy of lithium among alkali metals
0%
very high hydration energy of $Li^{+}$ ion

The correct statement(s) among the following is/are :

0%
beryllium oxide is amphoteric in nature.
0%
solubility of sulphates of II A group elements decreases down the group.
0%
reducing power of hydride of alkali metal decreases down the group.
0%
beryllium has diagonal relationship with aluminum.

Select the correct statement with respect to sodium peroxide?

0%
It decolourises the $KMnO_4$ solution.
0%
On heating with oxygen at $450^0C$ and 300 atm pressure, it becomes paramagnetic.
0%
It is obtained along with sodium metal when sodium oxide is heated to a temperature more than $400^oC$ .
0%
It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.

Explanation

(A)

$2Mn{ O }_4^-(pink)+16H^++5O_2^{2-}\rightarrow 2Mn^{2+}+8H_2O+5O_2$ .
(B)

$Na_2O_2+O_2\xrightarrow [300 atm]{> 450^oC} 2NaO_2 ({ O }_2^-$ contains on unpaired electron in

$\pi^*$ MO).
(C)

$2Na_2O\xrightarrow {400^oC} Na_2O_2+2Na$ .
(D) Gives only

$H_2O_2$ .

The hydration energy of

$Mg^{2+}$ is larger than that of

0%
$Al^{3+}$
0%
$Na^+$
0%
$Be^{2+}$
0%
$Mg^{3+}$

Explanation

Hydration energy depends on ionic radii and radii decreases as we move along column from left to right and increases down the group, also as positive charge increases, radii dereases. As radii increases, hydration energy decreases. So among all given options only sodium ion has bigger radii than

$Mg^{+2}$ so it has lower hydration energy than

$Mg^{+2}$ . Hydration energy of

$Na^{+} = -435$ KJ/mol. Hydration energy of

$Mg^{+2} = -1921$ KJ/mol.

Which of the following forms the most basic hydroxide?

0%
$Cu$
0%
$Al$
0%
$Na$
0%
$Zn$

A chemistry student trying to detect the metallic ion in a salt makes a paste on the clean

$Pt$ wire-loop of the salt with concentrated

$HCl.$ When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the color of the flame changes to grassy green. He should, therefore, conclude that the metal is:

0%
$Mg$
0%
$Ca$
0%
$Ba$
0%
$Ra$

Explanation

A chemistry student trying to detect the metallic ion in a salt makes a paste on the clean

$Pt$ wire-loop of the salt with concentrated

$HCl$ . When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the color of the flame changes to grassy green. He should , therefore, conclude that the metal is Barium

$(Ba)$ . The table below gives a rough color guide for the elements.

	Flame color :
$Li =$	red
$Na =$	strong, persistent orange
$K =$	lilac (pink)
$Rb =$	red (red-violet)
$Cs =$	blue/violet (see below)
$Ca =$	orange-red
$Sr =$	red
$Ba =$	pale green
$Cu =$	blue-green (often with white flashes)
$Pb =$	gray-white

The metallic luster exhibited by sodium is explained by :

0%
diffusion of sodium ions
0%
oscillations of loose electrons
0%
excitation of free protons
0%
existence of body centered cubic lattice

$Li$ has an abnormal behaviour in its group, which is ____________.

0%
lithium carbonate decomposes into its oxide on heating unlike other elements.
0%
$LiCl$ is covalent in nature.
0%
$Li_3N$ is a stable compound.
0%
$LiCl$ is a good conductor of electricity in the molten state.

Explanation

(A). Lithium carbonate, being less stable, decomposes into its oxide on heating, whereas other group IA carbonates are stable and do not decompose.

${ Li }_{ 2 }C{ O }_{ 3 }\ \underrightarrow { \triangle } \ { Li }_{ 2 }O+C{ O }_{ 2 }$

(B). Lithium halides, except fluoride, are covalent due to fajan's rule.

(D) Lithium chloride , like other alkali metals compounds , is a good conductor of electricity in molten state.

Nitrolim is a :

0%
mixture of calcium carbide and nitrogen
0%
mixture of calcium cyanamide and carbon
0%
mixture of calcium cyanide and carbon
0%
mixture of $NH_4 CN$ and $CaCN$

Which of the following metal sulphide is water soluble?

0%
$CaS$
0%
$ZnS$
0%
$HgS$
0%
$CdS$

Explanation

Calcium sulphide,

$CaS$ and zinc sulphide

$ZnS$ are slightly soluble in water.
Cadmium sulphide

$CdS$ and mercury (II) sulfide are insoluble in water.

X and Y are two metals. When burnt in air, X forms only oxide while Y forms oxide and nitride. The metals X and Y may be :

0%
$Ca$ and $Mg$
0%
$Na$ and $Mg$
0%
$Li$ and $Na$
0%
$Na$ and $K$

Explanation

Reaction with air;

$Mg+air\rightarrow MgO+Mg_3N_2$
and,
sodium forms peroxide and monoxide as product with air

$Na+air\rightarrow Na_2O_2+Na_2O$ .

Select the incorrect statement(s):

0%
$Cs^+$ is more hydrated than the other alkali metal ions
0%
Among the alkali metals Li, Na, K and Rb, lithium has the highest melting point.
0%
Ionic mobility of $Li^+$ is maximum among alkali metal cations.
0%
Ionisation potential of Li is lower than of Na

Which of the following reagent is used as fixer in photography?

0%
$AgBr$
0%
$AgNO_{3}$
0%
$Na_{2}S_{2}O_{3}\cdot 5H_{2}O$
0%
Both A and C

Explanation

$Na_{2}S_{2}O_{3}$ (as fixer) dissolves unreacted

$AgBr$ as:

$2Na_{2}S_{2}O_{3} +AgBr\rightarrow Na_{3}[Ag(S_{2}O_{3})_{2}] + NaBr$

Which of the following statement is incorrect?

0%
Sodium and potassium are soft and silvery white metals.
0%
Sodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates.
0%
Sodium and potassium burn in dry oxygen (excess) gives peroxides.
0%
Sodium and potassium are kept under kerosene to avoid contact with air and moisture.

Which of the following properties show a similar trend on moving Li to Cs within the group?

0%
Ionic mobility in aqueous solution
0%
Reactivity towards water.
0%
Solubility of bromide salt.
0%
Thermal stability of carbonate salt

The product obtained on fusion of

$BaS{ O }_{ 4 }$ and

${ Na }_{ 2 }C{ O }_{ 3 }$ is:

0%
$BaC{ O }_{ 3 }$
0%
$BaO$
0%
$Ba{ \left( OH \right) }_{ 2 }$
0%
$BaHS{ O }_{ 4 }$

Explanation

When

$BaS{ O }_{ 4 }$ and

${ Na }_{ 2 }C{ O }_{ 3 }$ are fused,

$BaC{ O }_{ 3 }$ is obtained.

$BaSO_4+Na_2CO_3\rightarrow BaCO_3+2NaSO_4$

Which of the following is not a alkali metal?

0%
sodium
0%
potassium
0%
gold
0%
lithium

Which statement is correct regarding the diagonal relationship between the Al and Be?

0%
$BeO$ and $Al_2O_3$ are amphoteric in nature
0%
Both carbide on hydrolysis produce same gas
0%
Both can form complex
0%
Both have nearly close m.p.

Explanation

(A) Beryllium oxide or hydroxide and aluminium oxide or hydroxide are amphoteric in nature. Oxides and hydroxides of other metals of group IIA are basic in character.
Thus, option A is correct.
(B) Bryllium carbide and aluminium carbide on hydrolysis produces methane gas.

$Be_2C+4H_2O \rightarrow 2Be(OH)_2 + CH_4$

$Al_4C_3+12H_2O \rightarrow 4Al(OH)_3 +3 CH_4$
Thus, the option B is correct.
(C) Both Be and Al form complexes (metal chelates0 specially with oxygen donors.
Thus, option C is correct.
(D) The melting point of Be is 1560 K.
The melting point of Al is 933 K.
Thus their melting points differ widely.
Hence, option D is incorrect.

Which of the following statement(s) is/are incorrect?

0%
Magnesium may be extracted by self reduction method.
0%
Down's process is used to extract magnesium from sea water.
0%
Magnalium is an alloy of magnesium.
0%
Formula of epsom salt is $MgSO_4.6H_2O$ .

Explanation

(A) Magnesium cannot be extracted by the self-reduction method. It is isolated by the electrolysis of fused magnesium chloride-containing sodium chloride. Thus, option A is incorrect.

(B) Down's process is used to extract sodium by the electrolysis of fused sodium chloride in presence of calcium chloride and KF. Thus, option B is incorrect.

(C) Magnalium is an alloy of magnesium. Apart from magnesium, it contains aluminium and small quantities of copper, nickel, and tin. Thus, option C is correct.

(D) The formula of Epsom salt is

$MgSO_4.7H_2O$ . It is a heptahydrate. Thus, option D is incorrect.

Which of the following does/do not impact characteristic colour to the flame?

0%
$MgSO_4$
0%
$CaCl_2$
0%
$Sr(NO_3)_2$
0%
$BeCl_2$

Explanation

$CaCl_2$ has orange colour.

$Sr(NO_3)_2$ has crimson colour flame.

Be and Mg do not impart any colour to the flame due to higher ionization energy and small size.The energy of the flame is not sufficient to excite the electrons to higher energy levels. Hence, they do not impart any characteristic colour to the flame

$CaCl_2$ is preferred over

$NaCl$ for clearing ice on roads on particularly in very cold countries. This is because:

0%
$CaCl_2$ is not soluble in $H_2O$ than $NaCl$
0%
$CaCl_2$ is hygroscopic but $NaCl$ is not
0%
eutectic mixture of $CaCl_2$ / $H_2O$ freezes at $-55^oC$ while that of $NaCl$ / $H_2O$ freezes at $-18^oC$
0%
$NaCl$ makes the road slippery but $CaCl_2$ does not

Explanation

$CaCl_2$ is preferred over

$NaCl$ for clearing ice on roads on particularly in very cold countries due to much lower freezing point of eutectic mixture of

$CaCl_2/H_2O$ .

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) form the reduction of boron trichloride by hydrogen:

0%
89.6 L
0%
67.2 L
0%
44.8 L
0%
22.4 L

Select the incorrect statement(s) :

0%
Magnesium can be burnt in the atmosphere of $CO_2$ and $SO_2$
0%
Magnesium reacts with alkyl halides to form Grignard's reagent
0%
Out of $Mg$ and $Ca$ , only $Mg$ reacts with $N_2$ to form magnesium nitride
0%
Calcium is less reactive than magnesium

Explanation

Options $A$ and $B$ are correct.

$Mg$ and $Ca$ both, reacts with $N_2$ to form magnesium nitride and calcium nitride respectively

$3Mg+N_2\rightarrow Mg_3N_2$

$3Ca+N_2\rightarrow Ca_3N_2$

Thus, option $C$ is incorrect.

Calcium is more reactive than magnesium because down the group reactivity of metals increases. So, option $D$ is incorrect

So these two statements are incorrectly given.

Hence, options C and D are correct.

X	Y
Liquid sodium metal	Breathing apparatus submarine
Potassium	Explosive
Potassium nitrate	Coolant in nuclear reaction
Potassium superoxide	Soft soap

Match the compounds/metal in(X) with their used in (Y). hence correct order is.

0%
A-I, B-III, C-II, D-IV
0%
A-III, B-IV, C-II, D-I
0%
A-II, B-I, C-III, D-IV
0%
A-IV, B-II, C-III, D-I

Consider the following reaction:

$M+O_2 \rightarrow MO_2$

$M$ is an alkali metal

$MO_2$ is a stable superoxide

0%
$M$ can not be $Li$ and $Na$
0%
$M$ can not be $Cs$ and $Rb$
0%
$M$ can not be $Li$ and $Rb$
0%
None of these

The correct increasing order of basic nature among Be, Mg, Ca and Sr is :

0%
$Be < Ca < Mg < Sr$
0%
$Be < Mg < Sr < Ca$
0%
$Be < Mg < Ca < Sr$
0%
$Ca < Sr < Be < Mg$

Explanation

The correct increasing order of basic nature among Be, Mg, Ca and Sr is

$Be < Mg < Ca < Sr$ .

$Be$ forms amphoteric oxides and hydroxides, whereas other alkaline earth metals form basic oxides and hydroxides. The basicity increases on moving down the group due to increase in the size of the metal ion, decrease in the ionization energy and increase in the electropositive character. This increases the polarity of metal oxygen bond and internuclear distance which in turn increases the ease of formation of ion and the basic character.

Which one of the following is correct with respect to molar ionic conductance of ions in aqueous solution?

0%
$Li^{+}\, <\, Na^{+}\, <\, K^{+}\, <\, Rb^{+}$
0%
$Rb^{+}\, <\, K^{+}\, <\, Na^{+}\, <\, Li^{+}$
0%
$Sr^{2+}\, <\, Ca^{2+}\, <\, Mg^{2+}\, <\, Be^{2+}$
0%
$Na^{+}\, <\, K^{+}\, <\, Li^{+}\, <\, Rb^{+}$

Explanation

Larger is the size of the ion, smaller is the degree of hydration and larger is the molar ionic conductance. Hence, the correct order of the molar ionic conductance is

$Li^{+}\, <\, Na^{+}\, <\, K^{+}\, <\, Rb^{+}$ .

The correct increasing order of melting point of alkali metal carbonates is:

0%
$Cs_2CO_3\, <\, Na_2CO_3\, <\, K_2CO_3\, <\, Rb_2CO_3\, <\, Li_2CO_3$
0%
$Li_2CO_3\, <\, Na_2CO_3\, <\, K_2CO_3\, <\, Rb_2CO_3\, <\, Cs_2CO_3$
0%
$Li_2CO_3\, <\, Rb_2CO_3\, <\, K_2CO_3\, <\, Na_2CO_3\, <\, Cs_2CO_3$
0%
None of these

Explanation

The melting point of a solid is the temperature at which it changes state from solid to liquid at atmospheric pressure. At the melting point, the solid and liquid phases exist in equilibrium.

The melting point of carbonates of a particular group increases due to an increase in atomic size. This increases the Van der Waal attraction, which requires more heat to melt.

Li, Na, K, Rb, Cs are IA group elements, the melting point increases from Li to Cs.
The correct order of melting point of carbonates of IA group elements is:

$Li_2CO_3\, <\, Na_2CO_3\, <\, K_2CO_3\, <\, Rb_2CO_3\, <\, Cs_2CO_3$

Hence, option (B) is correct.

Recently, sodium naphthalenide (

$C_{10}H_8Na$ ) has been used as reductant in complex formation.

$C_{10}H_8Na$ is :

0%
paramagnetic
0%
deep-green in colour
0%
diamagnetic
0%
colourless

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

0%
Both form basic carbonates.
0%
Both form soluble bicarbonates.
0%
Both form nitrides.
0%
Nitrates of both $Li$ and $Mg$ yield ${ NO }_{ 2 }$ and ${ O }_{ 2 }$ on heating.

Which is/are true statement(s)?

0%
The heats of hydration of the dispositive alkaline earth metal ions decrease with an increase in their ionic size
0%
Hydration of alkali metal ion is less than that of IIA.
0%
Alkaline earth metal ions, because of their much larger charge to size ratio exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them
0%
None of the above statements is correct

$Li(s)\, \rightarrow\, Li^{+}(aq)\, +\, e^{-}$ involved :

0%
sublimation
0%
ionization
0%
hydration
0%
all of these

Ripening of fruits can be caried out in presence of :

0%
$Na_2SO_4$
0%
$NaCl$
0%
$CaCl_2$
0%
$CaC_2$

Explanation

$\begin{array}{l} \text { Calcium Carbide }\left(\mathrm{CaC}_{2}\right) \text { can be used in ripening fruits. } \\ \text { It produces acetylene gas when it comes in contact with moisture } \\ \text { and acetylene gas accelerates the ripening process. } \end{array}$

Select correct statement(s).

0%
$Mg^{2+}$ ions are necessary for the activation of phosphate transfer enzymes.
0%
Mg is present in chlorophyll of green plants.
0%
Mg is present in chlorophyll used in photosynthesis in green plants.
0%
All the above are correct statements

Which of the following is/are correct statement(s)?

0%
$Ca_3(PO_4)_2$ in part of bones
0%
$3Ca_3(PO_4).CaF_2$ is part of enamel on teeth
0%
$Ca^{2+}$ ions are important in blood clotting
0%
All of the above are correct

Explanation

Calcium ions are essential for the formation of bones and teeth, the enamel in theteeth is a double salt of calcium,

$3Ca_3(PO_4)_2 .CaF_2$ .
The organic parts of the bone contain several proteins and

$Ca_3(PO_4)_2$ .
In body, Calcium ions are involved in blood clotting, normal muscle contraction.

Hydration energy ${\Delta H}_{hydra}.(kJ \,mol^{-1})$	Lattice energy ${\Delta H_u}(kJ \,mol^{-1})$
$Li^+$ -499	LiCl-840
$Na^+$ -390	NaCl-776
$K^+$ -305	KCl-703
$Cl^-$ -382

Which salt can be used to control humidity?

0%
$LiCl$
0%
$NaCl$
0%
$KCl$
0%
None of these

Explanation

$\Delta\,H_{solution}\, =\, \Delta\,H_{hydration}\, -\, \Delta\,H_{lattice\ energy}$

$\Delta H_{Hydration}\, =\, \Delta H_{hydration}(cation)\, +\, \Delta H_{hydration} (anion)$

$\Delta\,H_{solution}$ $(LiCl) = -499 -382 + 840 = -41\ kJ/mol$

Similarly,

$\Delta\,H_{solution} (NaCl) = -4 kJ/mol$

$\Delta\,H_{solution} (KCl) = +16 kJ/mol$

As $\Delta\,H_{solution} (LiCl)$ is highest so it will absorb water most easily and it can control humidity easily.

Burning of Mg is extinguished by :

0%
throwing $N_2$ liquid
0%
throwing sand
0%
throwing ice
0%
throwing water

Explanation

Magnesium fires cannot be extinguished by water. Magnesium continues to burn after oxygen is depleted. It than reacts with nitrogen from air to form magnesium nitride

$(Mg_3N_2)$ . When attempts are made to extinguish magnesium fires with water, magnesium aggressively reacts with hydrogen gas.

In the mineral, barium ion can be identified by :

0%
green colour in ame
0%
yellow precipitate with $Cr{ O }_{ 4 }^{ 2- }$ solution
0%
white precipitate with $S{ O }_{ 4 }^{ 2- }$
0%
all of the above

Explanation

${ Ba }^{ 2+ }$ ion in solution produces a yellow precipitate with

$K_{2}CrO_{4}$

$Ba^{2+} + k_{2}CrO_{4}\rightarrow BaCrO_{4}\downarrow + 2K^+$

${ Ba }^{ 2+ }$ ions in solution produces a white precipitate with

$(NH_4)_2SO_{4}$ Solutions.

${ Ba }^{ 2+ }+(NH_4)_2SO_4\rightarrow \underset{White\, ppt}{BaSO_4 \downarrow}+2NH_{4}^+$

Hence option- (D) is correct.

The first ionization potentials (

$eV$ ) of

$Be$ and

$B$ respectively are:

0%
$8.29, 9.32$
0%
$9.32, 9.32$
0%
$8.29, 8,29$
0%
$9.32,8.29$

Explanation

The first ionization potentials (

$eV$ ) of

$Be$ and

$B$ respectively are

$9.32, 8,29$ .

According to theory as we move from lest to right in a period the ionization potential should increase but in case of

$Be$ and

$B$ Beryllium is having more ionization potential than Boran due to completely filled s orbital in Beryllium(

$1s^{2}2s^{2}$ ).

Hence option D is correct.

CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 10 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 10 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

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