CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 4 - MCQExams.com

The electron affinity of Be is similar to ___________.
  • He
  • B
  • Li
  • Na
Be and Al resemble in the following but not in :
  • both form electron decient hydrides
  • both are rendered passive by $$HNO_3$$
  • both form amphoteric oxides
  • both have sp-hybridisation in their compounds
Lithium shows similarities with magnesium in its chemical behaviour because :
  • similar size, greater electronegativity and lower polarising power
  • similar size, same electronegativity, and lower polarising power
  • similar size, same electronegativity and similar high polarising power
  • none of the above
Which of the following pairs shows diagonal relationship?
  • $$Na$$ and $$Mg$$
  • $$Li$$ and $$Mg$$
  • $$Li$$ and $$Na$$
  • $$Al$$ and $$C$$
Which one is not the property of Lithium by which it differs from the rest of the alkali metals?
  • Extremely small size of Lithium atom
  • Greater polarizing power of Lithium ion
  • Highest electropositive character and highest ionization energy
  • Non availability of vacant d-orbitals in the valence shell
Which among the given elements form the strongest base?
169148_535305742fc94d9b833fdea5495817e9.png
  • A
  • B
  • C
  • D
  • E
  • F
  • G
What is the order of mobilities of the alkali metal ions in aqueous solution?
  • $$Li^{+}\,>\,Na^{+}\,>\,K^{+}\,>\,Cs^{+}\,>\,Rb^{+}$$
  • $$Na^{+}\,<\,Li^{+}\,<\,K^{+}\,<\,Rb^{+}\,<\,Cs^{+}$$
  • $$Li^{+}\,>\,K^{+}\,>\,Na^{+}\,>\,Rb^{+}\,>\,Cs^{+}$$
  • $$Li^{+}\,<\,Na^{+}\,<\,K^{+}\,<\,Rb^{+}\,<\,Cs^{+}$$

Which among the following elements shown in the table forms amphoteric oxide?


169157_2b310364fda2451d80d7bf3909153e58.png
  • $$A$$
  • $$B$$
  • $$C$$
  • $$D$$
  • $$E$$
  • $$F$$
  • $$G$$
Shine at freshly cut sodium is because of :
  • due to oscillations of free electrons.
  • due to weak metallic bonding.
  • due to absorption of light in crystal lattice.
  • due to the presence offree valency at the surface.
Among the alkali metals $$Cs$$ is the most reactive because :
  • its incomplete shell is nearest to the nucleus
  • it has a single electron in the valence shell
  • it is the heaviest alkali metal
  • its outermost electron is more loosely bound than the outermost electron ofthe other alkali metals
The characteristic not related to alkali metals is :
  • their ions are isoelectronic with noble gases.
  • metallic character.
  • low electronegativity.
  • high ionization energy.
Which of the following is/are correct statement(s) ?
(I) $$Ca^{2+}$$ ions are important in blood clotting.
(II) $$Ca_3(PO_4)_2$$ is a part of bones.
(III) $$3Ca_3(PO_4).CaF_2$$ is a part of enamel of teeth.
  • (I) and (II)
  • (II) and (III)
  • (I) and (III)
  • (I), (II) and (III)
The sequence of ionic mobility in aqueous solution is  :
  • $$Rb^+> K^+>Cs^+> Na^+$$
  • $$ Na^+> K^+> Rb^+ > Cs^+$$
  • $$K^+> Na^+> Rb^+> Cs^+ $$
  • $$Cs^+ > Rb^+> K^+ > Na^+$$
Smallest among these species is :
  • hydrogen.
  • helium.
  • lithium.
  • lithium ion.
The position in the periodic table to which the following metal belong :

Mg - an alkaline earth metal belongs to _________ .
  • 1-Period
  • 2-Period
  • 3-Period
  • 4-Period
The aqueous solutions of lithium salts are poor conductors of electricity as compared to that of other alkali metals because of:
  • high ionization energy
  • high electronegativity
  • lower ability of $$Li^+ $$ ions to polarize water molecules
  • higher degree of hydration of $$Li^+$$ ions
As the alkaline earth metals (except Be) tend to lose their valence electrons readily. They act as :
  • weak oxidizing agents.
  • weak reducing agents.
  • strong oxidizing agents.
  • strong reducing agents.
Potash alum is represented by the formula :
  • $$K_2SO_4\cdot Al_2(SO_4)_3\cdot 24H_2O$$
  • $$K\cdot Al(SO_4)_2\cdot 12 H_2O$$
  • Both (a) and (b)
  • None of these
Which of the following has maximum ionization energy?
  • $$Ba\rightarrow Ba^++e^-$$
  • $$Be\rightarrow Be^++e^-$$
  • $$Ca\rightarrow Ca^{2+}+2e^-$$
  • $$Mg\rightarrow Mg^{2+}+2e^-$$
Compare $$Li$$ and $$Be$$ according to the polarisation of cations :
  • $$Li^{+}\, <\, Be^{2+}$$
  • $$Li^{+}\, >\, Be^{2+}$$
  • $$Li^{+}\, =\, Be^{2+}$$
  • None of these
Among of alkali metals, the metal with highest ionization potential is :
  • Li
  • Na
  • K
  • Rb
The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because:
  • there is increase in the nuclear charge of the alkaline earth metal
  • there is decrease in the nuclear charge of the alkaline earth metal
  • there is no change in the nuclear charge
  • none ofthe above
$$KO_2$$ (potassium superoxide) is used in oxygen cylinders in space and submarines because, it : 
  • decomposes to give oxygen
  • eliminates moisture
  • absorbs $$CO_2$$
  • produces ozone
In the reaction : $$K_4[Fe(CN)_6] + K_2CO_3\rightarrow $$ the product formed is :
  • $$FeCO_3$$
  • $$KCN$$
  • $$KFeCO_3$$
  • $$K_3 [Fe(CN)_6]$$
(X), (Y), (Z) are elements in the third period. Oxide of (X) is ionic, that of (Y) is amphoteric, and of (Z) a giant molecule. 

(X), (Y) and (Z) will have atomic numbers in the order :
  • (X) < (Y) < (Z)
  • (Z) < (Y) < (X)
  • (X) < (Z) < (Y)
  • (Y) < (X) < (Z)
Among $$LiCl, RbCl, BeCl_2$$, and $$MgCl_2$$ the compounds with greatest and least ionic character, respectively are:
  • LiCl, RbCl
  • $$RbCl, BeCl_2$$
  • $$RbCl, MgCl_2$$
  • $$MgCl_2, BeCl_2$$
Photoelectric effect is maximum in:
  • $$Cs$$
  • $$Na$$
  • $$K$$
  • $$Li$$
Statement-1: The ionic mobility of $$Na^+_{(aq)}$$ is lower than that of $$K^+_{(aq)}$$
Statement-2 :$$r_{Na^+(aq)} > r_{k^+(aq)}$$
  • Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1
  • Statement-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1
  • Statement-1 is true, statement-2 is false
  • Statement-1 is false, statement-2 is true
Which of the following element(s) is/are not react directly with nitrogen to form nitride ?
  • Na
  • Li
  • K
  • Rb
Alkaline earth metal salt are :
  • paramagnetic
  • diamagnetic
  • ferromagnetic
  • all of these
Which among the following statements is incorrect for magnesium metal?
  • It burns in oxygen with a dazzling white flame
  • It reacts with cold water to form magnesium oxide and evolves hydrogen gas
  • It reacts with hot water to form magnesium hydroxide and evolves hydrogen gas
  • It reacts with steam to form magnesium hydroxide and evolves hydrogen gas
Ripening of fruits can be carried out in the presence of :
  • $$Na_2SO_4 $$
  • $$NaCl$$
  • $$CaCl_2$$
  • $$CaC_2$$
Be and Al have following resemblance due to diagonal relationship :
  • have nearly equal electronegativity.
  • form amphoteric oxides.
  • have same charge/radius ratio.
  • both form dimeric halides.
Select the correct statement(s) about barium :
  • It shows photoelectric effect.
  • It is silvery white metal.
  • It forms $$Ba(N_3)_2$$ which is used in preparation of green fire.
  • Its ionization energy is less than radium.
In certain matters, lithium differs from other alkali metals; the main reason for this is :  
  • small size of lithium atom and $$Li^+$$.
  • extremely high electropositivity of $$Li$$.
  • greater hardness of $$Li$$.
  • hydration of $$Li^+$$ ion.
State True or False.
In the electrolysis of fused calcium hydride, hydrogen is liberated at cathode.
  • True
  • False
$${K}_{2}C{S}_{3}$$ can be called :
  • Potassium Sulphocyanide
  • Potassium Thiocarbide
  • Potassium Thiocarbonate
  • Potassium Thiocyanate
Which of the following does not give an oxide on heating?
  • $$MgC{O}_{3}$$
  • $${Li}_{2}C{O}_{3}$$
  • $$ZnC{O}_{3}$$
  • None of the above
State True or False.
$$Be{ H }_{ 2 }$$ is an ionic hydride.
  • True
  • False
As per observation (iii) LiH is more stable than NaH, because :
  • Due to small size of $${ Li }^{ + }$$, the lattice energy of LiH is greater
  • Due to greater size of $${ H }^{ - }$$, the lattice energy of LiH is greater
  • LiH is more covalent than NaH
  • Due to greater size of $${ Na }^{ + }$$, the lattice energy of NaH is greater.
Which compound is used for removal of moisture from glass apparatus?
  • $$CaCl_2$$
  • Anhydrous $$CaCl_2$$
  • $$HCl$$
  • All of these
The metallic lustre exhibited by sodium is explained by:
  • diffusion of sodium ions
  • oscillation of loose electrons
  • excitation of free protons
  • existence of body centered cubic lattice
The hydration energy of $${Mg^{2+}}$$ is greater than that of :
  • $${Al^{3+}}$$
  • $${Na^+}$$
  • $${Be^{2+}}$$
  • $${Mg^{3+}}$$
Molten sodium is used in nuclear reactors to:
  • absorb neutrons in order to control the chain reaction
  • slow down the fast neutrons
  • absorb the heat generated by nuclear fission
  • extract radio -isotopes produced in the reactor
The correct sequence of increasing covalent character is represented by :
  • $${BeCl_2}$$< $${NaCl}$$<$${LiCl}$$
  • $${NaCl}$$<$${LiCl}$$ <$${BeCl_2}$$
  • $${BeCl_2}$$ < $${LiCl}$$<$${NaCl}$$
  • $${LiCl}$$<$${NaC}$$l<$${BeCl_2}$$
Bone ash contains :
  • $$CaF_2$$
  • $${CaSO_4}$$
  • $${Ca_3(PO_4)_2}$$
  • $${Ca(H_2PO_4)_2}$$
When $$Na$$ and $$Li$$ placed in dry air we get :
  • $$NaOH, {Na}_{2}O, {Li}_{2}O$$
  • $${Na}_{2}C{O}_{3}, {Na}_{2}{O}_{2}, {Li}_{2}O$$
  • $${Na}_{2}O, {Li}_{3}N, N{H}_{3}$$
  • $${Na}_{2}O, {Li}_{2}O, {Li}_{3}N$$
EDTA is used in the estimation of :
  • $${ Mg }^{ 2+ }$$ ions
  • $${ Ca }^{ 2+ }$$ ions
  • Both $${ Ca }^{ 2+ }$$ and $${ Mg }^{ 2+ }$$ ions
  • $${ Mg }^{ 2+ }$$ ions but not $${ Ca }^{ 2+ }$$ ions
Which of the following groups of elements have chemical properties that are most similar :
  • $$Na, K, Ca$$
  • $$Mg, Sr, Ba$$
  • $$Be, Al, Ca$$
  • $$Be, Ra, Cs$$
Which of the following imparts violet colouration to the Bunsen burner non-luminous flame?
  • $$NaCl$$
  • $${BaCl_2}$$
  • $${CaCl_2}$$
  • $$KCl$$
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