CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 3 - MCQExams.com

The alkali metal which acts as a nutrient for plants is:
  • $$Na$$
  • $$K$$
  • $$Li$$
  • $$Rb$$
Alkaline earth metals act as:
  • reducing agents
  • oxidising agent
  • amphoteric
  • acidic
In the following, the element with the highest electropositivity is:
  • copper
  • caesium
  • barium
  • chromium
Which of the following statements is/are false?
  • The halides of beryllium are electron deficient and are polymeric with halogen bridges.
  • $$BeF_2$$ is very soluble in water owing to high solvation energy of Be but fluorides of other alkaline earth metals are almost insoluble.
  • CaO, SrO and BaO react exothermically with water forming soluble hydroxides.
  • The bicarbonates of alkaline earth metals are only stable in solutions.
Which of the following statements is true?
  • BeO and $$Be(OH)_2$$ both are purely basic in nature.
  • Be can expand its covalency to six.
  • Be largely forms covalent compounds which get easily hydrolysed.
  • Be combines with hydrogen upon heating to form $$BeH_2$$.
Which amongst the following is soluble in water?
  • $$BeSO_4$$
  • BeO
  • $$Be(OH)_2$$
  • $$BeCl_2$$
In which case first has lower melting point than second?
  • Mg, Be
  • Be, Ca
  • Cs, Li
  • K, Li
The ionic radii of alkali metal ions in water (hydrated radii) are in the order :
  • $$Li^+> Na^+ > K^+ > Rb^+ < Cs^+$$
  • $$Li^+(aq.)> Na^+(aq.) > K^+ (aq.)> Rb^+ (aq.)>Cs^+(aq.)$$
  • $$Li^+< Na^+ > K^+ > Rb^+ > Cs^+$$
  • $$Li^+(aq.) > Na^+(aq.) < K^+ (aq.) < Rb^+ (aq.) < Cs^+(aq.)$$
Which of the following statements is false?
  • Both $$Be(OH)_2$$ and $$Al(OH)_3$$ dissolve in excess of alkali to give beryllate ion $$[Be(OH)_4]^{2-}$$ and aluminate ion $$[Al(OH)_4]^-$$ espectively.
  • Chlorides of Be and Al are soluble in organic solvents and are strong Lewis acid.
  • Be and Al have strong tendency to from complexes with F-ligands.
  • The chlorides of Be and Al have $$Cl^-$$ bridged structure in liquid phase.
On heating in air, sodium burns violently with golden yellow flame forming :
  • monoxide and hydroxide
  • monoxide and carbonate
  • peroxide and hydroxide
  • monoxide and peroxide
In which case second has lower boiling point than first?
  • Li, K
  • Be, Mg
  • Li, Cs
  • Ca, Mg
Which is the major constituent of gun powder?
  • Nitre
  • Sulphur
  • Charocal
  • Chile salt petre
A metal which does not react with nitrogen is: 
  • $$Li$$
  • $$K$$
  • $$Ca$$
  • $$Mg$$
The alkali metals:
  • form salts like hydrides
  • posses low ionisation potential
  • have a high affinity towards non-metals.
  • have low density
Nitrate can be converted into metal oxide on heating in case of :
  • Li
  • Na
  • both (a) and (b)
  • None of these
Calgon used as a water softener is:
There is loss in weight when mixture of $$Li_{2}CO_{3}$$ and $$Na_{2}CO_{3}\cdot10H_{2}O$$ is heated strongly. This loss is due to :
  • $$Li_{2}CO_{3}$$
  • $$Na_{2}CO_{3}\cdot10H_{2}O$$
  • both (a) and (b)
  • none of these
The common name, "cream of tartar" refers to :
  • $$KHC_{4}H_{4}O_{6}$$
  • $$K(SbO)C_{4}H_{4}O_{6}$$
  • $$KNaC_{4}H_{4}O_{6}$$
  • $$Mg_{2} (OH)_{2}(C_{4}H_{4}O_{6})H_{2}O$$
Which are involved in various physiological functional in animals?
  • $$Na^{+}$$
  • $$K^{+}$$
  • Both (a) and (b)
  • None of these
Arrange Li, Na, K, Rb, Cs in order of  increasing ionization energy:
  • $$Cs\, <\, Rb\, <\, K\, <\, Na\, <\, Li$$
  • $$K\, <\, Rb\, <\, Cs\, <\, Na\, <\, Li$$
  • $$Cs\, <\, K\, <\, Rb\, <\, Na\, <\, Li$$
  • None of these
Arrange Li, Na, K, Rb, Cs in order of  increasing electron-affinity:
  • $$Cs\, <\, Rb\, <\, K\, <\, Na\, <\, Li$$
  • $$K\, <\, Na\, <\, Cs\, <\, Rb\, <\, Li$$
  • $$Cs\, <\, K\, <\, Rb\, <\, Li\, <\, Na$$
  • None of these
Increasing order of atomic radii 
 Li, Na, K, Rb, Cs :
  • Li < Na < K < Rb < Cs
  • Li < Na < K < Cs < Rb
  • Li < K < Na< Rb < Cs
  • None of these
Flame test is not given by :
  • Ca
  • Ba
  • Be
  • Li
Hydration energy of :
  • $$Be^{2+}\, >\, Na^{+}$$
  • $$Be^{2+}\, <\, Na^{+}$$
  • $$Be^{2+}\, =\, Na^{+}$$
  • None of these
Arrange Li, Na, K, Rb, Cs in order of  increasing electronegativity:
  • $$Cs\, <\, Rb\, =\, K\, <\, Na\, <\, Li$$
  • $$Rb\, <\, Cs\, =\, Li\, <\, Na\, <\, L$$
  • $$Cs\, <\, Rb\, =\, Na\, <\, Li\, <\, K$$
  • None of these
The correct order of covalent nature is:
  • $$BeCl_2 > LiCl$$
  • $$BeCl_2 < LiCl$$
  • $$BeCl_2 = LiCl$$
  • None of these
Choose the correct options regarding the nature of oxides formed by $$Li$$ and $$Be$$ :
  • $$Li_2O$$ is acidic while $$BeO$$ is basic.
  • $$BeO$$ is amphoteric.
  • $$Li_2O$$ is basic.
  • $$Li_2O$$ and $$BeO$$ both are amphoteric.
 Compare  thermal stability of $$Li_2CO_3$$ and $$BeCO_3$$ :
  • $$Li_2CO_3\, > \,BeCO_3$$
  • $$Li_2CO_3\, < \,BeCO_3$$
  • $$Li_2CO_3\,= \,BeCO_3$$
  • None of these
Compare $$Li$$ and $$Be$$ according to their $$(IE)_2$$ :
  • $$Li\, >\, Be$$
  • $$Li\, <\, Be$$
  • $$Li\, =\, Be$$
  • None of these
Size of hydrated ion of $$Li^+ and  Be^{2+} $$ is :
  • $$Li^{+}\, <\, Be^{2+}$$
  • $$Li^{+}\, >\, Be^{2+}$$
  • $$Li^{+}\, = \, Be^{2+}$$
  • None of these
Which has no effect in terms of action under normal heating?

$$ Na_2CO_3 \ and \ CaCO_3 \\$$
  • $$ Na_2CO_3 \quad $$
  • $$ CaCO_3 \quad \\ $$
  • $$ Na_2CO_3 \ and \ CaCO_3 \ both\\$$
  • $$ None \ of \ these \\$$
The bicarbonate of alkali metal which does not exist in solid state is:
  • $$LiHCO_3$$
  • $$NaHCO_3$$
  • $$KHCO_3$$
  • $$RbHCO_3$$
Statement: The lattice energy of $$LiCl$$ is smaller than $$NaCl$$.

State whether the given statement is true or false.
  • True
  • False
Compare $$Li^{+}$$ and $$Be^{+}$$ in ionic conductance.
  • $$Be^{+}$$>$$Li^{+}$$
  • $$Be^{+}$$<$$Li^{+}$$
  • $$Be^{+}$$=$$Li^{+}$$
  • None of these
Estimation of calcium and magnesium is done by :
  • EDTA.
  • oxalate.
  • phosphate.
  • None of these.
Select correct statement(s):
  • $$Mg^{2+}$$ ions are necessary for the activation of phosphate transfer enzymes.
  • Mg is present in chlorophyll used in photosynthesis in green plants.
  • Operation of $$Na^{+}\, -\, K^{+}$$ pumps is biological.
  • All the above are correct statements.
Among $$Na^+, Na, Mg $$ and $$Mg^{2+}$$ the largest atom is :
  • $$Mg^{2+}$$
  • Mg
  • Na
  • $$Na^+$$
Be and Al show diagonal relationship hence, both have :
  • same degree of electronegativity.
  • amphoteric nature of oxides.
  • approximately same charge/radius ratio.
  • all the properties above.
II A (alkaline earth metals) and II B (zinc family) resemble :
  • $$MgSO_4 .7H_2O$$ is isomorphous with $$ZnSO_4. 7H_2O$$
  • II A and II B cations are not precipitated by $$H_2S$$ in acidic medium
  • both (a) and (b)
  • None of the above
Which does not exist in solid state?
  • $$NaHCO_3$$
  • $$Na_{2}CO_{3}$$
  • $$LiHCO_3$$
  • $$CaCO_3$$
Following are the ionisation potential values of : 

$$(I_1) 899 kJ mol^{-1}, (I_2) 1757 kJ mol^{-1}, (I_3) 15000 kJ mol^{-1}$$
  • Na
  • K
  • Be
  • Ne
Which is used for fixing atmospheric nitrogen?
  • $$CaCN_2$$ (nitrolim)
  • $$Li_3N$$
  • $$Mg_3N_2$$
  • All of these
Li resembles to element X which is not the member of alkali metals.
The element X is :
  • Mg
  • Be
  • Ca
  • B
Lightest alkaline earth metal is :
  • Be
  • Mg
  • Ca
  • Sr
Alkaline earth metals are :
  • reducing agent
  • dehydrating agent
  • amphoteric
  • oxidising agent
Li resembles to element X which is not the member of alkali metals. The group of X is?
  • II
  • III
  • IV
  • I
Li has chemical properties most similar to :
  • Al
  • Ca
  • Mg
  • Ti
Which one of the following has magnesium?
  • Vitamin $$B_{12}$$
  • Chlorophyll
  • Haemocyanin
  • Carbonic anhydrase
$$Mg$$ and $$Li$$ and similar in their properties due to:
  • same $$\dfrac {e}{m}$$ ratio
  • same electron affinity
  • same group
  • same radius
The activity of alkaline earth metals as reducing agent :
  • decreases from Be to Ba
  • increases from Be to Ba
  • increase from Be to Ca and decreases from Ca to Ba
  • decreases from Be to Ca and increases from Ca to Ba
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