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

State whether the following statement is true or false.

Reactivity and reducing power decreases on going from group 1 to group 2.
  • True
  • False
The hydration energy of $$Mg^{2+}$$ is greater than that of :
  • $$A1^{3+}$$
  • $$Na^{+}$$
  • $$Be^{3+}$$
  • $$Mg^{3+}$$
The alkali metal that reacts with nitrogen directly to form nitride is:
  • $$Li$$
  • $$Na$$
  • $$K$$
  • $$Rb$$
Out of the elements marked A, B, C, D, E, F, G and H
which form super oxide?  
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  • E and G
  • C, E and G
  • A and D
  • G and B
Be and Al show diagonal relationship and thus :
  • their oxides are soluble in alkali solution forming $$[Be(OH)_4]^{3-}$$
  • they form complex anion $$BeF_4^{2-}$$ and $$AlF_6^{3-}$$
  • $$BeCl_2$$ and $$AlCl_3$$ are Lewis acid
  • oxides are basic
The material used in photoelectric cells contains:
  • $$Cs$$
  • $$Si$$
  • $$Sn$$
  • $$Ti$$
When sodium is heated in moist air, the ultimate product obtained is:
  • $$\displaystyle Na_{2}O $$
  • $$NaOH$$
  • $$\displaystyle Na_{2}CO_{3} $$
  • $$\displaystyle Na_{2}O_{2} $$
Alkali metals readily react with oxyacids forming corresponding salts like $${ M }_{ 2 }{ CO }_{ 3 }$$, $${ M }H{ CO }_{ 3 }$$, $${ M }N{ O }_{ 3 }$$, $${ M }_{ 2 }{ SO }_{ 4 }$$, etc. with evolution of hydrogen. They also dissolve in liquid $${ NH }_{ 3 }$$ but without the evolution of hydrogen. The color of its dilute solution is blue but when it is heated and concentrated then its color becomes bronze.

Which of the following statement about the sulphate of alkali metal is correct :
  • except $${ Li }_{ 2 }{ SO }_{ 4 }$$ all sulphate of other alkali metals are soluble in water.
  • all sulphates of alkali metals except lithium sulphate forms alum.
  • the sulphates of alkali metals cannot be hydrolysed.
  • all of these.
Select the correct order of ionic conductance of the following cations in an aqueous solution.
  • $${ Li }^{ + }<{ Na }^{ + }<{ K }^{ + }<{ Rb }^{ + }$$
  • $${ Li }^{ + }>{ Na }^{ + }>{ K }^{ + }>{ Rb }^{ + }$$
  • $${ Li }^{ + }<{ Na }^{ + }>{ K }^{ + }>{ Rb }^{ + }$$
  • $${ Li }^{ + }={ Na }^{ + }<{ K }^{ + }<{ Rb }^{ + }$$
Among the following hydroxides, the one which has the lowest value of $$K_{sp}$$at ordinary temperature is:
  • $$Be(OH)_2$$
  • $$Mg(OH)_2$$
  • $$Ca(OH)_2$$
  • $$Ba(OH)_2$$
Which of the following does not decompose water?
  • $$Be$$
  • $$Mg$$
  • $$Ca$$
  • $$Sr$$
Which of the following has the maximum coordinate number not more than 4?
  • Beryllium
  • Calcium
  • Barium
  • Radium
A metal $$M$$ forms water-soluble sulphate $$MSO_4$$, water-insoluble hydroxide$$M(OH)_2$$ and oxide $$MO$$ which becomes inert on heating. The hydroxide is soluble in $$NaOH$$. Then $$M$$ is:
  • $$Be$$
  • $$Mg$$
  • Cannot be determine as data is incomplete
  • $$Sr$$
Which of the following alkaline earth metal does not impart characteristic colour to flame?
  • $$Ca$$
  • $$Sr$$
  • $$Ba$$
  • $$Be$$
Which of the following alkaline earth metal indirectly form a polymeric hydride with three centre bond?
  • $$Mg$$
  • $$Be$$
  • Both $$A$$ and $$B$$
  • none of these
The metal oxides of alkaline earth metal can be formed by heating corresponding carbonates except:
  • $$BeO$$
  • $$MgO$$
  • $$CaO$$
  • none of these
All alkaline earth metals combine directly with $$H_2$$ and form ionic hydrides as $$MH_2$$ except:
  • $$Mg$$
  • $$Ca$$
  • $$Be$$
  • $$Sr$$
Which of the following arrangements is correct in respect to solubility in water?
  • $$CaSO_{4} > BaSO_{4} > BeSO_{4} > MgSO_{4} > SrSO_{4}$$
  • $$BeSO_{4} > MgSO_{4} > CaSO_{4} > SrSO_{4} > BaSO_{4}$$
  • $$BaSO_{4} > SrSO_{4} > CasO_{4} > MgSO_{4} > BeSO_{4}$$
  • $$BeSO_{4} > CaSO_{4} > MgSO_{4} > SrSO_{4} > BaSO_{4}$$
Oxidation number of calcium in calcium phosphate :
  • $$1^+$$
  • $$1^-$$
  • $$0$$
  • $$2^+$$
  • $$3^+$$
Beryllium differs in properties from other elements of its own group but shows resemblance with aluminium because of:
  • relatively bigger ionic radius and high polarising power of $$Be$$
  • relatively smaller ionic radius and high polarising power of $$Be$$
  • relatively bigger ionic radius is the only reason behind this
  • none of the above
Sodium ions helps in:
  • transmission of nerve signals
  • transport of sugar and amino acids into cells
  • activation of different enzymes
  • oxidation of glucose to produce ATP
Alkaline earth's metals are denser than alkali metals because metallic bonding in alkaline earth's metal is:
  • stronger
  • weaker
  • volatile
  • none of the above
Berly is an important ore of:
  • $$Be$$
  • $$Ba$$
  • $$Mg$$
  • $$Sr$$
The correct increasing order of solubility of the sulphates in water is:
  • $$BeSO_4>MgSO_4>CaSO_4>SrSO_4>BaSO_4$$
  • $$BaSO_4>SrSO_4>CaSO_4>MgSO_4>BeSO_4$$
  • $$BaSO_4>CaSO_4>SrSO_4>BeSO_4MgSO_4$$
  • $$BaSO_4>SrSO_4>MgSO_4>CaSO_4> BeSO_4$$
$$BeF_2$$ is soluble in water, whereas the fluorides of other alkaline earth metals are insoluble because of:
  • greater hydration energy of $$Be^{2+}$$ ion as compared to crystal lattice
  • covalent nature of $$ BeF_2$$
  • ionic nature of $$ BeF_2$$
  • none of these
Which of the following alkaline earth metal can never have more than four molecules of water of crystallisation?
  • $$Sr$$
  • $$Ca$$
  • $$Be$$
  • $$Mg$$
Which of the following statement is true regarding alkaline earth metals?
  • Beryllium and barium compounds are poisonous in nature
  • Beryllium shows diagonal relationship with aluminium
  • Beryllium salts impart yellow colour to flame
  • Both $$A$$ and $$B$$
Which of the given halide does not conduct electricity in fused state and in solutions?
  • $$BeCl_2$$
  • $$MgCl_2$$
  • $$CaCl_2$$
  • none of these
The thermal stability of alkaline earth metal carbonates- $$MgCO_3, CaCO_3, SrCO_3$$ and $$BaCO_3$$, follows the order:
  • $$BaCO_3 > SrCO_3 > CaCO_3 > MgCO_3$$
  • $$CaCO_3 > SrCO_3 > MgCO_3 > BaCO_3$$
  • $$MgCO_3 > CaCO_3 > SrCO_3 > BaCO_3$$
  • $$BaCO_3 > SrCO_3 > MgCO_3 > CaCO_3$$
Consider the metals $$B, Al, Mg$$ and $$K$$. What will be the correct order of their metallic character?
  • $$K> Mg> Al> B$$
  • $$Al> Mg> B> K$$
  • $$B> Al> Mg> K$$
  • $$Mg> Al> K> B$$
$$LiOH$$ reacts with $$CO_{2}$$ to form $$Li_{2}CO_{3}$$ (atomic mass of $$Li = 7)$$. The amount of $$CO_{2}$$ (in g) consumed by $$1\ g$$ of $$LiOH$$ is closest to _______.
  • $$0.916$$
  • $$1.832$$
  • $$0.544$$
  • $$1.088$$
Both lithium and magnesium display similar properties due to the diagonal relationship; however, the one which is incorrect, is:
  • both form nitrides
  • nitrates of both $$Li$$ and $$Mg$$ yield $$NO_{2}$$ and $$O_{2}$$ on heating
  • both from basic carbonates
  • both form soluble bicarbonates
Elements showing diagonal relationship are:
  • $$Li$$ and $$Be$$
  • $$Li$$ and $$Mg$$
  • $$Li$$ and $$Na$$
  • $$Al$$ and $$Si$$
Select the incorrect choice: 
  • The solubility of alkaline earth metal carbonates, sulfates, and chromates increases from $$Be$$ to $$Ba$$.
  • The solubility of alkaline earth metal hydroxides is less than that of alkali metal hydroxides.
  • Solubility of alkaline earth metal oxides increases from $$Be$$ to $$Ba$$.
  • $$SO_2$$ on passing in lime water turns it milky.
The most abundant metal ion present in the human body is
  • $$Zn^{2+}$$
  • $$Ca^{2+}$$
  • $$Na^+$$
  • $$Fe^{2+}$$
Identify the elements having same valence shell.
  • $$P$$ and $$Q$$
  • $$Q$$ and $$R$$
  • $$P$$ and $$R$$
  • $$P$$, $$Q$$ and $$R$$
When a solution of alkaline earth metal in liquid ammonia is evaporated:
  • they form hexammoniates , $$M(NH_{3})_{6}$$
  • The ammoniates decomposed at high temperatures
  • The tendency to form ammoniates decreses with increases in the size of the metal
  • The ammoniates are good conductors of electricity
Why is $$LiF$$ almost insoluble in water whereas $$LiCl$$ is soluble not only in water but also in acetone?
  • For a substance to dissolve in water, its hydration energy must be greater than its lattice energy.
  • Due to small size of $$Li^+$$ ion and $$F^-$$ ions, lattice energy of $$LiF$$ is very high. $$LiF$$ is covalent in nature. Therefore, $$LiF$$ is insoluble in water.
  • Due to larger size of $$Cl^-$$ ion, the lattice energy of $$LiCl$$ is less than its hydration energy. Hence, $$LiCl$$ is soluble in water and in acetone.
  • Due to the large size of $$F^-$$ ion and high hydration energy, the $$LiF$$ is insoluble in water.
Choose the correct answer form the alternatives given.
When alkaline earth metals dissolve in ammonia, they form coloured solution like alkali metals . Which of the following observations regarding the reaction are correct?
(i) Dilute solution are bright blue in colour due to solvated electrons.
(ii) These solutions decompose to form amides and hydrogen.
(iii) From this solution the ammoniates $$[M(NH_3)_6]^{2+}$$ can be recovered by evaporation.
  • Only (i) and (ii)
  • Only (i) and (ii) and (iii)
  • Only (ii) and (iii)
  • Only (i)
$$Be$$ and $$Al$$ exhibit a diagonal relationship. Which of the following statements about them is/are not true? 
(i) Both react with HCI to liberate $$H_2$$.
(ii) They are made passive by $$HNO_3$$.
(iii) Their carbides give acetylene on treatment with water.
(iv) Their oxides are amphoteric.
  • (iii) and (iv)
  • (i) and (iii)
  • (i) only
  • (iii) only
Beryllium shows a diagonal relationship with aluminium. Which of the following similarity is incorrect?
  • $$Be_2C$$ like $$Al_4C_3$$ yields methane on hydrolysis .
  • Be like Al is rendered passive by $$HNO_3$$.
  • $$Be(OH)_2$$ like $$Al(OH)_3$$ is basic.
  • Be forms beryllates A1 forms aluminates.
What is the biological importance of $$Na^+$$ and $$K^+$$ ions in cell fluids like blood plasma?
  • They participate in transmission of nerve signals .
  • They regulate the number of red and white blood corpuscles in the cell.
  • They can be present in any amount in the blood since they are absorbed by the cells.
  • They regulate the viscosity and colour of the blood.
Which among the following elements of group-$$2$$ exhibit anomalous properties?
  • Be
  • Mg
  • Ca
  • Ba
A metal M reacts with nitrogen to give nitride which on reaction with water produces ammonia gas. Metal M can be:
  • Na
  • K
  • Li
  • Rb
Sulphates of Be and Mg are readily soluble in water but sulphates of Ca, Sr and Ba are insoluble. This is due to the fact that:
  • the greater hydration enthalpies of $$Be^{2+} and Mg^{2+}$$ overcome the lattice enthalpy
  • high lattice enthalpy of $$Be^{2+}$$ and $$Mg^{2+}$$ makes them soluble in water
  • solubility decreases from $$BeSO_4$$ to $$BaSO_4$$ due to increase in ionic size
  • $$BeSO_4$$ and $$MgSO_4$$ are ionic in nature while other sulphates are covalent
Choose the correct answer form the alternatives given.
Which of the following compounds are not arranged in correct order as indicated?
  • $$SrCl_2 < CaCl_2 < MgCl_2 < BeCl_2$$(increasing extent of hydrolysis)
  • $$SrCl_2 < CaCl_2 < MgCl_2 < BeCl_2$$(increasing lattice energy)
  • $$CaSO_4 < MgSO_4 < BeSO_4 $$(increasing stability)
  • $$Be(OH)_2 < Mg(OH)_2 < Ca(OH)_2$$(increasing solubility)
Which of the following statement is not correct.
  • $$LiOH$$ is amphoteric in nature.
  • $$LiCl$$ is soluble in pyridine.
  • $$Li_3N$$ is stable while $$Na_3N$$ doesn't exist even at room temperature.
  • $$BeO$$ is amphoteric in nature.
Beryllium and aluminium exhibit many properties which are similar. But, the two elements differ in:
  • Forming covalent halides
  • Forming polymeric hybrids
  • Exhibiting maximum covalency in compounds
  • Exhibiting amphoteric nature in their oxides
The reducing power of metal depends on various factors. Suggest the factors which make $$Li$$, the strongest reducing agent in aqueous solution.
  • Sublimation enthalpy
  • Ionisation enthalpy
  • Hydration enthalpy
  • Electron-gain enthalpy
Ionic mobility of $$L{ i }^{ + }$$ is less than that of $$N{ a }^{ + }$$ and $${ K }^{ + }$$ ions both, because:
  • ionisation potential of Li is small
  • charge density of $$L{ i }^{ + }$$ ion is high
  • hydration tendency of $$L{ i }^{ + }$$ ion is high
  • $$L{ i }^{ + }$$ has two electron
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