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

Decompostiion of $$Ag_{2}CO_{3}$$ in
  • $$T > 300^{o}C$$
  • $$T > 100^{o}C$$
  • $$both$$
  • $$none$$
The correct order of increase thermal stability of $${K_2}C{O_{3,}}MgC{O_{3,}}CaC{O_3}$$ and $$BeC{O_3}$$ is
  • $$BeC{O_3} < MgC{O_3} < {K_2}C{O_3} < CaC{O_3}$$
  • $$BeC{O_3} < MgC{O_3} < {Ca}C{O_3} < {K_2}C{O_3}$$
  • $$MgC{O_3} < BeC{O_3} < CaC{O_3} < {K_2}C{O_3}  $$
  • $${K_2}C{O_3} < MgC{O_3} < CaC{O_3} < BeC{O_3} $$
Which type of salt is formed by only Li of group I ?
  • Nitrate salt
  • Nitride salt
  • Nitrite salt
  • Carbonate salt
Which one of the alkali metals,forms only,the normal oxide $$M_2O$$ on heating in air?
  • $$Li$$
  • $$Na$$
  • $$Rb$$
  • $$K$$
Which of the following forms complex ions readily ?
  • $$B{e^{2 + }}$$
  • $$M{g^{2 + }}$$
  • $$S{r^{2 + }}$$
  • $$B{a^{2 + }}$$
Which one of the following statements is correct regarding s-block element?
  • Superoxides of alkali metals are black in colour.
  • $$CsI$$ (Cesium iodide) is less soluble in water due to high covalent character.
  • On heating $${\text{LiN}}{{\text{O}}_{\text{3}}}$$ gives a brown gas.
  • Oxide and hydroxide of $${\text{Be}}$$ are acidic in nature.
Which of the following is not true regarding beryllium?
  • It is not readily attacked by acids.
  • Its chloride may have bridge structure in vapour phase.
  • Its hydride is electron-deficient and polymeric in nature.
  • It burns brilliantly in powdered form to give beryllium peroxide.
Which of the following relation is correct?
  • $$TiC>ScN>MgO>NaF$$ (Hardness)
  • $$NaCl<CsCl$$  (Lattice energy)
  • $$BeCl_{ 2 }>{ MgCl }_{ 2 }>{ CaCl }_{ 2 }$$ ( Melting point )
  • None of these
Identify the element based on the statement given below:
Soft metal stored under kerosene oil
  • Sodium
  • Carbon
  • Beryllium
  • Sulphur
Which of the alkaline earth elements forms covalent bonds?
  • Ca
  • Mg
  • Sr
  • Be
Among the following, the incorrect statement is ?
  • $${\text{BaS}}{{\text{O}}_{\text{4}}}$$ is most soluble in $${{\text{H}}_{\text{2}}}{\text{O}}$$ among alkaline earth suphates
  • $${{\text{H}}_{\text{2}}}{{\text{O}}_2}$$ 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 $${{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$$
  • $${\text{Xe}}{{\text{F}}_{\text{6}}}$$ on complete hydrolysis produces $${\text{Xe}}{{\text{O}}_3}$$
  • $${\text{Ni}}{\left( {{\text{CO}}} \right)_{\text{4}}}$$ exists but similar stable complex is not formed by $${\text{Pd}}$$ or $${\text{Pt}}$$
At infinite dilution whose conductivity is maximum ? 
  • $${ K }^{ + }$$
  • $${ Li }^{ + }$$
  • $$Cs^{ + }$$
  • $$Na^{ + }$$
The nitride ion in lithium nitride is composed of:
  • 7 protons + 10 electrons
  • 10 protons + 10 electrons
  • 7 protons + 7 protons
  • 10 protons + 7 electrons
The correct order of reducing character of alkali metal is:
  • Na < K < Rb < Li
  • Rb < K < Na < Li
  • Li < Na < K < Rb
  • Rb < Na < K < Li
Which of the following is/are the correct order of mobility?
  • $$\mathrm { Li } ^ { + } < \mathrm { Na } ^ { + } < \mathrm { K } ^ { + }$$
  • $$\mathrm { Na } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Al } ^ { 3 + }$$
  • $$\mathrm { Al } ^ { 3 + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Na } ^ { + }$$
  • $$\mathrm { Li } ^ { + } > \mathrm { Na } ^ { + } > \mathrm { K } ^ { + }$$
In aqueous solution the largest ion is: 
  • $$Na (aq)$$
  • $$Cs (aq)$$
  • $$Rb (aq)$$
  • $$Li (aq)$$
Sodium metal is soft but iron is a hard metal. this difference arise due to_________
  • sodium has lesser atomic mass than iron
  • sodium has only one valence electron where as iron has more
  • there is one unpaired electron in sodium but four unpaired electron in iron
  • 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_______.
  • Be
  • Ba
  • Ca
  • Mg
Correct order of density is:-
  • Li > Na
  • K > Na
  • Mg > Ca
  • Cs < Rb
Which of the following properties of $$IA$$ group metals decreases as the atomic number rises:
  • Metallic character
  • lonic radius
  • Melting point
  • Density
Which element among the alkali metal is more reactive towards $$O_2$$ ?
  • Sodium
  • Potassium
  • Lithium
  • Caesium
Alkali metals in each period have
  • Largest size
  • Lowest IE
  • Highest IE
  • Highest electronegativity
Which of the following alkaline earth metal does not react with water?
  • $$Ba$$
  • $$Sr$$
  • $$Ca$$
  • $$Be$$
Which element is likely to have an electronegativity similar to that of aluminum? 
  • Barium
  • Beryllium
  • Magnesium
  • 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 $$ { Y } ?$$
  • $$Al$$
  • $$Ca$$
  • $$Mg$$
  • $$P$$
Which are correct match?
$$1$$.Eka silicon - Ba
$$2$$Eka aluminium - Ga
$$3$$Eka manganese - Tc
$$4$$Eka scandium - B
  • $$2, 3$$
  • $$1, 2, 4$$
  • $$1, 4$$
  • All
Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in:
  • exhibiting maximum covalency in compounds
  • forming polymeric hydrides
  • forming covalent halides
  • exhibiting amphoteric nature in their oxides.
Which of the following species will have the smallest hydrated radii?
  • $${ Li }^{ + }$$
  • $${ Na }^{ + }$$
  • $${ K }^{ + }$$
  • $${ Cs }^{ + }$$
All the following substances react with water. The pair that gives the same gaseous product is:
  • $$K$$ and $${ KO }_{ 2 }$$
  • $$Na$$ and $${ NO }_{ 2 }{ O }_{ 2 }$$
  • $$Ca$$ and $${ CaH }_{ 2 }$$
  • $$Ba$$ and $${ BaO }_{ 2 }$$
Select the  correct statement about $$Mg^{2+}$$   ions : 
  • These ions are concentrated more in intracelluar then in extracellular fluids in animal bodies
  • Activation of phosphate transfer enzyme takes place in their presencde
  • They are involved in carbohydrate metablism
  • All are correct statement
Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is:
  • Both form basic carbonates.
  • Both form soluble bicarbonates.
  • Both form nitrides.
  • None of these.
Which does not gives reddish brown vapour on heating? 
  • $$LiNO_{ 3 }$$
  • $$KNO_{ 3 }$$
  • $$Be(NO_{ 3 })_{ 2 }$$
  • $$Pb(NO_{ 3 })_{ 2 }$$
Which is not a similar characteristics about  the electronic of Be, Mg, Ca?
  • All the atoms have pair of s-electrons in their outermost energy level
  • All the atoms contain a pair of p-electrons in their outermost energy level
  • All are alkaline earth metals
  • All are of second group of the periodic table
When the $$Na$$ and $$Li$$ placed in dry air we get:
  • $$\mathrm { NaOH } , \mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 2 } \mathrm { O }$$
  • $$\mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } , \mathrm { Na } _ { 2 } \mathrm { O } _ { 2 } , \mathrm { Li } _ { 2 } \mathrm { O }$$
  • $$\mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 3 } \mathrm { N } , \mathrm { NH } _ { 3 }$$
  • $$\mathrm { Na } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 2 } \mathrm { O } , \mathrm { Li } _ { 3 } \mathrm { N }$$
Smallest among these species is:
  • Hydrogen
  • Helium
  • Lithium
  • lithium ion
Which of the following represents calcium chlorite?
  • $$CaClO_2$$
  • $$Ca(ClO_4)_2$$
  • $$Ca(ClO_3)_2$$
  • $$Ca(ClO_2)_2$$
When sodium is heated with moist air, the product obtained is:
  • $${Na}_{2}{O}_{2}$$
  • $${Na}_{2}{CO}_{3}$$
  • $$NaOH$$
  • $${Na}_{2}O$$
Inter nuclear distance between two sodium atoms is 372pm. Covalent radius of sodium atom will be:
  • 372pm
  • less than 186pm
  • greater than 186pm
  • 186pm
Select the correct order of ionic radii.
  • $$Li> F> Cl> Br$$
  • $$Li> I> F< Cl$$
  • $$I> Li< F< Cl$$
  • $$F< Cl> Br< I>Li$$
Select the correct statement(s) :
  • Solubitlity of group $$IA$$ fluroides and carbonates increases down the group
  • $$LiF$$ is insoluble or vert less soluable in water whereas other alkali metals flourides are soluble
  • 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
  • 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:
  • Reducing power in aqueous solution is maximum for lithium metal
  • Electron affinity order: $$ O^+ > O >O^{2-}_2 > O^{2-} $$
  • Order of oxidation number of oxygen: $$ O_3 > KO_2 > BaO_2 >K_2 O $$
  • pH of aqueous solution: $$ LiCl > BeCl_2 > MgCl_2 >AlCl_3 $$
Sodium when burnt in excess of oxygen gives sodium oxide.
  • True
  • False
Compare $$x$$ and $$y$$ bond angle in above molecule.
1722764_71259c5a058646cdab044f44997a486a.png
  • $$x > y$$
  • $$y > x$$
  • $$x= y$$
  • none of these
Which of the following equations is correct?
  • $$3LiNO_3\xrightarrow { heat } 2LiNO_2 + O_2$$
  • $$NaNO_3 + NaNH_2\xrightarrow { 80^o - 90^oC } 2NaOH +N_2O$$
  • Potassium formate is heated with free exposure to air. $$2HCOOK + O_2\longrightarrow K_2CO_3 + H_2O +CO_2$$
  • 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?
  • Exceptionally small size of its atom
  • Its high polarizing power
  • It has high degree of hydration
  • Exceptionally low ionization enthalpy
Choose the correct statements from the following.
  • Beryllium is not readily attacked by acids because of the presence of an oxide film on the surface of the metal
  • Beryllium sulphate is readily soluble in water as the greater hydration enthalpy of $$ { Be }^{ 2+ } $$ overcomes the lattice enthalpy factor
  • Beryllium exhibits coordination number more than four
  • Beryllium oxide is purely acidic in nature
The material used in solar cells contains:
  • Cs
  • Si
  • Sn
  • Ti
Select the correct statement:
  • Lithium carbonate is soluble in water
  • Potassium carbonate is soluble in water
  • Barium carbonate is soluble in water
  • Bicarbonate of lithium is insoluble in water
Select the correct statement 
  • White ppt. of $$ BaSO_{3} $$ and $$ CaSO_{3} $$ is soluble in dil. $$ HNO_{3} $$, dil. HCl, and $$ CH_{3}COOH $$
  • On standing, the precipitate $$ BaSO_{3} $$ is slowly oxidized to sulphate and then becomes insoluble in dilute mineral acids
  • When excess of $$ SO_{2} $$ gas is passed in the solution of $$ BaSO_{3} $$ and $$ CaSO_{3} $$ then white turbidity disappears
  • 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?
  • $$LiHCO_{3}$$
  • $$NaHCO_{3}$$
  • $$KHCO_{3}$$
  • $$NH_{4}HCO_{3}$$
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