MCQ Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 12

Decompostiion of

$Ag_{2}CO_{3}$ in

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$T > 300^{o}C$
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$T > 100^{o}C$
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$both$
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$none$

The correct order of increase thermal stability of

${K_2}C{O_{3,}}MgC{O_{3,}}CaC{O_3}$ and

$BeC{O_3}$ is

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$BeC{O_3} < MgC{O_3} < {K_2}C{O_3} < CaC{O_3}$
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$BeC{O_3} < MgC{O_3} < {Ca}C{O_3} < {K_2}C{O_3}$
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$MgC{O_3} < BeC{O_3} < CaC{O_3} < {K_2}C{O_3}$
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${K_2}C{O_3} < MgC{O_3} < CaC{O_3} < BeC{O_3}$

Explanation

As the size of cation increases the bond between cation and carbonate ion (

$CO_3^{-2}$ ) becomes weak so the thermal stability decreases.

So the correct order of thermal stability is :

$BeCO_3<MgCO_3<CaCO_3<K_2CO_3$ .

Hence option C is correct.

Which type of salt is formed by only Li of group I ?

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Nitrate salt
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Nitride salt
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Nitrite salt
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Carbonate salt

Which one of the alkali metals,forms only,the normal oxide

$M_2O$ on heating in air?

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$Li$
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$Na$
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$Rb$
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$K$

Which of the following forms complex ions readily ?

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$B{e^{2 + }}$
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$M{g^{2 + }}$
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$S{r^{2 + }}$
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$B{a^{2 + }}$

Which one of the following statements is correct regarding s-block element?

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Superoxides of alkali metals are black in colour.
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$CsI$ (Cesium iodide) is less soluble in water due to high covalent character.
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On heating ${\text{LiN}}{{\text{O}}_{\text{3}}}$ gives a brown gas.
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Oxide and hydroxide of ${\text{Be}}$ are acidic in nature.

Which of the following is not true regarding beryllium?

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It is not readily attacked by acids.
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Its chloride may have bridge structure in vapour phase.
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Its hydride is electron-deficient and polymeric in nature.
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It burns brilliantly in powdered form to give beryllium peroxide.

Which of the following relation is correct?

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$TiC>ScN>MgO>NaF$ (Hardness)
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$NaCl<CsCl$ (Lattice energy)
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$BeCl_{ 2 }>{ MgCl }_{ 2 }>{ CaCl }_{ 2 }$ ( Melting point )
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None of these

Identify the element based on the statement given below:
Soft metal stored under kerosene oil

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Sodium
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Carbon
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Beryllium
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Sulphur

Which of the alkaline earth elements forms covalent bonds?

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Ca
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Mg
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Sr
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Be

Explanation

An element will form a covalent compound if its electron losing tendency is low, and it does not form an ionic compound by losing electron(s).

Beryllium is the first element in the group

$2$ of alkaline earth metals. Being the first element of the group, it has a very small atomic size. Due to this, the effective nuclear charge on the valence electrons is high as the nuclear pull is strong, and it becomes difficult for it to lose an electron.

So, beryllium

$(Be)$ forms a covalent compound by sharing its valence electrons.

Therefore, Option (D) is correct.

Among the following, the incorrect statement is ?

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${\text{BaS}}{{\text{O}}_{\text{4}}}$ is most soluble in ${{\text{H}}_{\text{2}}}{\text{O}}$ among alkaline earth suphates
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${{\text{H}}_{\text{2}}}{{\text{O}}_2}$ is obtained in better yield by treating ${\text{Ba}}{{\text{O}}_{\text{2}}}$ with ${{\text{H}}_{\text{3}}}{\text{P}}{{\text{O}}_{\text{4}}}$ rather than with ${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$
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${\text{Xe}}{{\text{F}}_{\text{6}}}$ on complete hydrolysis produces ${\text{Xe}}{{\text{O}}_3}$
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${\text{Ni}}{\left( {{\text{CO}}} \right)_{\text{4}}}$ exists but similar stable complex is not formed by ${\text{Pd}}$ or ${\text{Pt}}$

At infinite dilution whose conductivity is maximum ?

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${ K }^{ + }$
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${ Li }^{ + }$
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$Cs^{ + }$
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$Na^{ + }$

The nitride ion in lithium nitride is composed of:

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7 protons + 10 electrons
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10 protons + 10 electrons
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7 protons + 7 protons
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10 protons + 7 electrons

The correct order of reducing character of alkali metal is:

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Na < K < Rb < Li
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Rb < K < Na < Li
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Li < Na < K < Rb
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Rb < Na < K < Li

Which of the following is/are the correct order of mobility?

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$\mathrm { Li } ^ { + } < \mathrm { Na } ^ { + } < \mathrm { K } ^ { + }$
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$\mathrm { Na } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Al } ^ { 3 + }$
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$\mathrm { Al } ^ { 3 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Na } ^ { + }$
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$\mathrm { Li } ^ { + } > \mathrm { Na } ^ { + } > \mathrm { K } ^ { + }$

In aqueous solution the largest ion is:

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$Na (aq)$
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$Cs (aq)$
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$Rb (aq)$
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$Li (aq)$

Sodium metal is soft but iron is a hard metal. this difference arise due to_________

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sodium has lesser atomic mass than iron
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sodium has only one valence electron where as iron has more
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there is one unpaired electron in sodium but four unpaired electron in iron
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sodium react readily with air and moisture but iron is resistant to action of water

Which of the following element have maximum tendency to form complex compound_______.

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Be
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Ba
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Ca
0%
Mg

Correct order of density is:-

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Li > Na
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K > Na
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Mg > Ca
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Cs < Rb

Which of the following properties of

$IA$ group metals decreases as the atomic number rises:

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Metallic character
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lonic radius
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Melting point
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Density

Which element among the alkali metal is more reactive towards

$O_2$ ?

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Sodium
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Potassium
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Lithium
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Caesium

Alkali metals in each period have

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Largest size
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Lowest IE
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Highest IE
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Highest electronegativity

Which of the following alkaline earth metal does not react with water?

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$Ba$
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$Sr$
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$Ca$
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$Be$

Which element is likely to have an electronegativity similar to that of aluminum?

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Barium
0%
Beryllium
0%
Magnesium
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Strontium

An element Y reacts according to the following sequence.

Y

$\xrightarrow { burns\ in\ O_{2}}$ white solid

$\underrightarrow { HCl (aq)}$ solution

$\underrightarrow { NaOH(aq)}$ white precipitate

$\xrightarrow { in \ excess \ of\ NaOH(aq)}$ solution
What could be element

${ Y } ?$

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$Al$
0%
$Ca$
0%
$Mg$
0%
$P$

Which are correct match?

$1$ .	Eka silicon - Ba
$2$	Eka aluminium - Ga
$3$	Eka manganese - Tc
$4$	Eka scandium - B

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$2, 3$
0%
$1, 2, 4$
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$1, 4$
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All

Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in:

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exhibiting maximum covalency in compounds
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forming polymeric hydrides
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forming covalent halides
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exhibiting amphoteric nature in their oxides.

Explanation

Due to diagonal relationship,

$Be$ and

$Al$ exhibits similar properties But covalency of

$Be$ is

$4$ because it has an absence of d-orbital whereas, covalency of

$Al$ is up to

$6$ due to the presence of vacant

$d-$ orbital. Hence they differ in exhibiting the maximum covalency in compounds.

Which of the following species will have the smallest hydrated radii?

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${ Li }^{ + }$
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${ Na }^{ + }$
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${ K }^{ + }$
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${ Cs }^{ + }$

All the following substances react with water. The pair that gives the same gaseous product is:

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$K$ and ${ KO }_{ 2 }$
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$Na$ and ${ NO }_{ 2 }{ O }_{ 2 }$
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$Ca$ and ${ CaH }_{ 2 }$
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$Ba$ and ${ BaO }_{ 2 }$

Select the correct statement about

$Mg^{2+}$ ions :

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These ions are concentrated more in intracelluar then in extracellular fluids in animal bodies
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Activation of phosphate transfer enzyme takes place in their presencde
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They are involved in carbohydrate metablism
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All are correct statement

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

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Both form basic carbonates.
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Both form soluble bicarbonates.
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Both form nitrides.
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None of these.

Which does not gives reddish brown vapour on heating?

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$LiNO_{ 3 }$
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$KNO_{ 3 }$
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$Be(NO_{ 3 })_{ 2 }$
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$Pb(NO_{ 3 })_{ 2 }$

Which is not a similar characteristics about the electronic of Be, Mg, Ca?

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All the atoms have pair of s-electrons in their outermost energy level
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All the atoms contain a pair of p-electrons in their outermost energy level
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All are alkaline earth metals
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All are of second group of the periodic table

When the

$Na$ and

$Li$ placed in dry air we get:

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$\mathrm { NaOH } , \mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 2 } \mathrm { O }$
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$\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } , \mathrm { Na } _ { 2 } \mathrm { O } _ { 2 } , \mathrm { Li } _ { 2 } \mathrm { O }$
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$\mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 3 } \mathrm { N } , \mathrm { NH } _ { 3 }$
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$\mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 3 } \mathrm { N }$

Smallest among these species is:

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Hydrogen
0%
Helium
0%
Lithium
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lithium ion

Which of the following represents calcium chlorite?

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$CaClO_2$
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$Ca(ClO_4)_2$
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$Ca(ClO_3)_2$
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$Ca(ClO_2)_2$

When sodium is heated with moist air, the product obtained is:

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${Na}_{2}{O}_{2}$
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${Na}_{2}{CO}_{3}$
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$NaOH$
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${Na}_{2}O$

Inter nuclear distance between two sodium atoms is 372pm. Covalent radius of sodium atom will be:

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372pm
0%
less than 186pm
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greater than 186pm
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186pm

Select the correct order of ionic radii.

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$Li> F> Cl> Br$
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$Li> I> F< Cl$
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$I> Li< F< Cl$
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$F< Cl> Br< I>Li$

Select the correct statement(s) :

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Solubitlity of group $IA$ fluroides and carbonates increases down the group
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$LiF$ is insoluble or vert less soluable in water whereas other alkali metals flourides are soluble
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hydrogen peroxide acts as reducing agent in the presence of other oxidizing agent. this is because it can take up an atom of oxygen to give water and oxygen gas
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All the carbonates and bicarbonates of alkali metals are soluble expect $NaHCO_3$ and solubility increase down the group but $Li_2CO_3$ is springly soluble

Choose the incorrect statement:

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Reducing power in aqueous solution is maximum for lithium metal
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Electron affinity order: $O^+ > O >O^{2-}_2 > O^{2-}$
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Order of oxidation number of oxygen: $O_3 > KO_2 > BaO_2 >K_2 O$
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pH of aqueous solution: $LiCl > BeCl_2 > MgCl_2 >AlCl_3$

Sodium when burnt in excess of oxygen gives sodium oxide.

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True
0%
False

Explanation

Sodium when burnt in excess of oxygen gives sodium peroxide

$(Na_2O_2)$ . Lithium gives oxide, sodium gives peroxide, and other alkali metals form superoxides in this reaction.

$2Na+O_2\to Na_2O_2$

Compare

$x$ and

$y$ bond angle in above molecule.

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$x > y$
0%
$y > x$
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$x= y$
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none of these

Which of the following equations is correct?

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$3LiNO_3\xrightarrow { heat } 2LiNO_2 + O_2$
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$NaNO_3 + NaNH_2\xrightarrow { 80^o - 90^oC } 2NaOH +N_2O$
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Potassium formate is heated with free exposure to air. $2HCOOK + O_2\longrightarrow K_2CO_3 + H_2O +CO_2$
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Solid $KBrO_3$ is heated with powdered charcoal. $2KBrO_3 + 3C \longrightarrow 2KBr + 3CO_2$

Which of the following are the correct reasons for anomalous behaviour if lithium?

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Exceptionally small size of its atom
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Its high polarizing power
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It has high degree of hydration
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Exceptionally low ionization enthalpy

Choose the correct statements from the following.

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Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal
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Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of ${ Be }^{ 2+ }$ overcomes the lattice enthalpy factor
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Beryllium exhibits coordination number more than four
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Beryllium oxide is purely acidic in nature

The material used in solar cells contains:

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Cs
0%
Si
0%
Sn
0%
Ti

Select the correct statement:

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Lithium carbonate is soluble in water
0%
Potassium carbonate is soluble in water
0%
Barium carbonate is soluble in water
0%
Bicarbonate of lithium is insoluble in water

Explanation

Lithium carbonate is a white solid, non-hygroscopic, poorly soluble in water, as well as most organic solvents. It is more soluble in cold water than hot water.

Potassium carbonate $(K_2CO_3)$ is a white salt, soluble in water (insoluble in ethanol) which forms a strongly alkaline solution. It can be made as the product of potassium hydroxide's absorbent reaction with carbon dioxide.

Barium carbonate is a white powder. It is insoluble in water and soluble in most acids, with the exception of sulphuric acid.

Lithium bicarbonate is soluble in water.

Hence the correct answer is option B.

Select the correct statement

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White ppt. of $BaSO_{3}$ and $CaSO_{3}$ is soluble in dil. $HNO_{3}$ , dil. HCl, and $CH_{3}COOH$
0%
On standing, the precipitate $BaSO_{3}$ is slowly oxidized to sulphate and then becomes insoluble in dilute mineral acids
0%
When excess of $SO_{2}$ gas is passed in the solution of $BaSO_{3}$ and $CaSO_{3}$ then white turbidity disappears
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The hydrogen carbonates of alkali metals are soluble in water, but are less soluble that corresponding normal carbonates

Which of the following does not exist in solid state?

0%
$LiHCO_{3}$
0%
$NaHCO_{3}$
0%
$KHCO_{3}$
0%
$NH_{4}HCO_{3}$

Explanation

$LiHCO_3$ does not exist in solid state. This is because

$Li^+$ cation has highest hydration enthalpy. So, they do not exist in solid state

CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 12 - 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 12 - MCQExams.com

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Practice Class 11 Medical Chemistry Quiz Questions and Answers

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