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

Decompostiion of Ag2CO3Ag2CO3 in
  • T>300oCT>300oC
  • T>100oCT>100oC
  • bothboth
  • nonenone
The correct order of increase thermal stability of K2CO3,MgCO3,CaCO3K2CO3,MgCO3,CaCO3 and BeCO3BeCO3 is
  • BeCO3<MgCO3<K2CO3<CaCO3BeCO3<MgCO3<K2CO3<CaCO3
  • BeCO3<MgCO3<CaCO3<K2CO3BeCO3<MgCO3<CaCO3<K2CO3
  • MgCO3<BeCO3<CaCO3<K2CO3MgCO3<BeCO3<CaCO3<K2CO3
  • K2CO3<MgCO3<CaCO3<BeCO3K2CO3<MgCO3<CaCO3<BeCO3
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 M2OM2O on heating in air?
  • LiLi
  • NaNa
  • RbRb
  • KK
Which of the following forms complex ions readily ?
  • Be2+Be2+
  • Mg2+Mg2+
  • Sr2+Sr2+
  • Ba2+Ba2+
Which one of the following statements is correct regarding s-block element?
  • Superoxides of alkali metals are black in colour.
  • CsICsI (Cesium iodide) is less soluble in water due to high covalent character.
  • On heating LiNO3LiNO3 gives a brown gas.
  • Oxide and hydroxide of BeBe 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>NaFTiC>ScN>MgO>NaF (Hardness)
  • NaCl<CsClNaCl<CsCl  (Lattice energy)
  • BeCl2>MgCl2>CaCl2BeCl2>MgCl2>CaCl2 ( 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 ?
  • BaSO4BaSO4 is most soluble in H2OH2O among alkaline earth suphates
  • H2O2H2O2 is obtained in better yield by treating BaO2BaO2 with H3PO4H3PO4 rather than with H2SO4H2SO4
  • XeF6XeF6 on complete hydrolysis produces XeO3XeO3
  • Ni(CO)4Ni(CO)4 exists but similar stable complex is not formed by PdPd or PtPt
At infinite dilution whose conductivity is maximum ? 
  • K+K+
  • Li+Li+
  • Cs+Cs+
  • Na+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?
  • Li+<Na+<K+Li+<Na+<K+
  • Na+<Mg2+<Al3+Na+<Mg2+<Al3+
  • Al3+<Mg2+<Na+Al3+<Mg2+<Na+
  • Li+>Na+>K+Li+>Na+>K+
In aqueous solution the largest ion is: 
  • Na(aq)Na(aq)
  • Cs(aq)Cs(aq)
  • Rb(aq)Rb(aq)
  • Li(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 IAIA 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 O2O2 ?
  • 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?
  • BaBa
  • SrSr
  • CaCa
  • BeBe
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 burns in O2burns in O2−−−−−−    white solid      HCl(aq)HCl(aq)−−−−−          solution      NaOH(aq)NaOH(aq)−−−−−−−    white precipitate    in excess of NaOH(aq)in excess of NaOH(aq)−−−−−−−−−−−−−    solution
What could be element Y?Y?
  • AlAl
  • CaCa
  • MgMg
  • PP
Which are correct match?
11.Eka silicon - Ba
22Eka aluminium - Ga
33Eka manganese - Tc
44Eka scandium - B
  • 2,32,3
  • 1,2,41,2,4
  • 1,41,4
  • 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+Li+
  • Na+Na+
  • K+K+
  • Cs+Cs+
All the following substances react with water. The pair that gives the same gaseous product is:
  • KK and KO2KO2
  • NaNa and NO2O2NO2O2
  • CaCa and CaH2CaH2
  • BaBa and BaO2BaO2
Select the  correct statement about Mg2+Mg2+   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? 
  • LiNO3LiNO3
  • KNO3KNO3
  • Be(NO3)2Be(NO3)2
  • Pb(NO3)2Pb(NO3)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 NaNa and LiLi placed in dry air we get:
  • NaOH,Na2O,Li2ONaOH,Na2O,Li2O
  • Na2CO3,Na2O2,Li2ONa2CO3,Na2O2,Li2O
  • Na2O,Li3N,NH3Na2O,Li3N,NH3
  • Na2O,Li2O,Li3NNa2O,Li2O,Li3N
Smallest among these species is:
  • Hydrogen
  • Helium
  • Lithium
  • lithium ion
Which of the following represents calcium chlorite?
  • CaClO2CaClO2
  • Ca(ClO4)2Ca(ClO4)2
  • Ca(ClO3)2Ca(ClO3)2
  • Ca(ClO2)2Ca(ClO2)2
When sodium is heated with moist air, the product obtained is:
  • Na2O2Na2O2
  • Na2CO3Na2CO3
  • NaOHNaOH
  • Na2ONa2O
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>BrLi>F>Cl>Br
  • Li>I>F<ClLi>I>F<Cl
  • I>Li<F<ClI>Li<F<Cl
  • F<Cl>Br<I>LiF<Cl>Br<I>Li
Select the correct statement(s) :
  • Solubitlity of group IAIA fluroides and carbonates increases down the group
  • LiFLiF 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 NaHCO3NaHCO3and solubility increase down the group but Li2CO3Li2CO3 is springly soluble
Choose the incorrect statement:
  • Reducing power in aqueous solution is maximum for lithium metal
  • Electron affinity order: O+>O>O22>O2O+>O>O22>O2
  • Order of oxidation number of oxygen: O3>KO2>BaO2>K2OO3>KO2>BaO2>K2O
  • pH of aqueous solution: LiCl>BeCl2>MgCl2>AlCl3LiCl>BeCl2>MgCl2>AlCl3
Sodium when burnt in excess of oxygen gives sodium oxide.
  • True
  • False
Compare xx and yy bond angle in above molecule.
1722764_71259c5a058646cdab044f44997a486a.png
  • x>yx>y
  • y>xy>x
  • x=yx=y
  • none of these
Which of the following equations is correct?
  • 3LiNO3heat2LiNO2+O23LiNO3heat2LiNO2+O2
  • NaNO3+NaNH280o90oC2NaOH+N2ONaNO3+NaNH280o90oC−−−−−2NaOH+N2O
  • Potassium formate is heated with free exposure to air. 2HCOOK+O2K2CO3+H2O+CO22HCOOK+O2K2CO3+H2O+CO2
  • Solid KBrO3KBrO3 is heated with powdered charcoal. 2KBrO3+3C2KBr+3CO22KBrO3+3C2KBr+3CO2
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 Be2+Be2+ 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 BaSO3BaSO3 and CaSO3CaSO3 is soluble in dil. HNO3HNO3, dil. HCl, and CH3COOHCH3COOH
  • On standing, the precipitate BaSO3BaSO3 is slowly oxidized to sulphate and then becomes insoluble in dilute mineral acids
  • When excess of SO2SO2 gas is passed in the solution of BaSO3BaSO3 and CaSO3CaSO3 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?
  • LiHCO3LiHCO3
  • NaHCO3NaHCO3
  • KHCO3KHCO3
  • NH4HCO3NH4HCO3
0:0:3


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Chemistry Quiz Questions and Answers