CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 10 - MCQExams.com

Alkaline earth metals are better reducing agents than alkali metals.
  • True
  • False
Berylium resembles aluminum closely in its properties though it belongs to a different group.
  • True
  • False
The solubility in water of sulphates down the Be group is $$ be > Mg > Ca >Sr > Ba $$ This is due to 
  • Increase in melting point
  • High ionization energy
  • Higher coordination number
  • All of those
Arrange the following elements in the increasing order of their atomic radii:
  • $$Na < Li < Rb < C < K$$
  • $$Cs < Rb < K < Na < Li$$
  • $$K < Rb < Cs < Na < Li$$
  • $$Li < Na < K < Rb < Cs$$
The fuel in the atomic pile is:
  • thorium
  • sodium
  • petroleum
  • uranium
Alkali metals and alkaline earth metals have the characteristics of :
  • high melting points
  • very high oxidation potentials
  • solubility in liquid ammonia
  • all of the above
Which of the following statement is incorrect?
  • Across a period, the trend of radius and ionisation energy are generally opposite to each other.
  • The metallic radius of potassium is greater than its covalent radius.
  • Amongst $$Li^{-},\:Be^{-},\:B^{-}$$ and $$C^{-},\: Li^{-}$$ is least stable ion.
  • Atomic and ionic radii of niobium and tantalum are almost same.
Which of the following will have the largest size in water?
  • $$Rb^{+}$$
  • $$Na^{+}$$
  • $$K^{+}$$
  • $$Li^{+}$$
The solubility of II group hydroxides increases with molecular weight. This is because:
  • lattice energy is same but hydration energy decreases down the group.
  • hydration energy is same but lattice energy decreases down the group.
  • both lattice and hydration energy increase down the group.
  • decrease in lattice energy down the group is faster than decrease in hydration energy.
A substance which gives brick red colour in flame test and breaks down on heating to give oxygen and a brown gas is :
  • magnesium nitrate
  • calcium nitrate
  • barium nitrate
  • strontium nitrate
Which of the following statement(s) is/are true?
  • Both $$LiCl$$ and $$MgCl_{2}$$ are deliquescent.
  • Lithium is least reactive but the strongest reducing agent amongst all the alkali metals.
  • Liquid sodium metal is used as a coolant in fast breeder nuclear reactors.
  • Lithium iodide is the most ionic in nature among all alkali metal halides.
The highest reducing power in aqueous medium of lithium among other alkali metals is due to:
  • very small size of lithium atom
  • very low sublimation energy of lithium
  • the lowest ionization energy of lithium among alkali metals
  • very high hydration energy of $$Li^{+}$$ ion
The correct statement(s) among the following is/are :
  • beryllium oxide is amphoteric in nature.
  • solubility of sulphates of II A group elements decreases down the group.
  • reducing power of hydride of alkali metal decreases down the group.
  • beryllium has diagonal relationship with aluminum.
Select the correct statement with respect to sodium peroxide?
  • It decolourises the $$KMnO_4$$ solution.
  • On heating with oxygen at $$450^0C$$ and 300 atm pressure, it becomes paramagnetic.
  • It is obtained along with sodium metal when sodium oxide is heated to a temperature more than $$400^oC$$.
  • It gives both hydrogen peroxide and oxygen gas with water as well as with sulphuric acid.
The hydration energy of $$Mg^{2+}$$ is larger than that of
  • $$Al^{3+}$$
  • $$Na^+$$
  • $$Be^{2+}$$
  • $$Mg^{3+}$$
Which of the following forms the most basic hydroxide?
  • $$Cu$$
  • $$Al$$
  • $$Na$$
  • $$Zn$$
A chemistry student trying to detect the metallic ion in a salt makes a paste on the clean $$Pt$$  wire-loop of the salt with concentrated $$HCl.$$ When he takes a small amount of this paste and keeps it in a non-luminous Bunsen flame, the color of the flame changes to grassy green. He should, therefore, conclude that the metal is:
  • $$Mg$$
  • $$Ca$$
  • $$Ba$$
  • $$Ra$$
The metallic luster exhibited by sodium is explained by :
  • diffusion of sodium ions
  • oscillations of loose electrons
  • excitation of free protons
  • existence of body centered cubic lattice
$$Li$$ has an abnormal behaviour in its group, which is ____________.
  • lithium carbonate decomposes into its oxide on heating unlike other elements.
  • $$LiCl$$ is covalent in nature.
  • $$Li_3N$$ is a stable compound.
  • $$LiCl$$ is a good conductor of electricity in the molten state.
Nitrolim is a :
  • mixture of calcium carbide and nitrogen
  • mixture of calcium cyanamide and carbon
  • mixture of calcium cyanide and carbon
  • mixture of $$NH_4 CN$$ and $$CaCN$$
Which of the following metal sulphide is water soluble?
  • $$CaS$$
  • $$ZnS$$
  • $$HgS$$
  • $$CdS$$
X and Y are two metals. When burnt in air, X forms only oxide while Y forms oxide and nitride. The metals X and Y may be :
  • $$Ca$$ and $$Mg$$
  • $$Na$$ and $$Mg$$
  • $$Li$$ and $$Na$$
  • $$Na$$ and $$K$$
Select the incorrect statement(s):
  • $$Cs^+$$ is more hydrated than the other alkali metal ions
  • Among the alkali metals Li, Na, K and Rb, lithium has the highest melting point.
  • Ionic mobility of $$Li^+$$ is maximum among alkali metal cations.
  • Ionisation potential of Li is lower than of Na
Which of the following reagent is used as fixer in photography?
  • $$AgBr$$
  • $$AgNO_{3}$$
  • $$Na_{2}S_{2}O_{3}\cdot 5H_{2}O$$
  • Both A and C
Which of the following statement is incorrect?
  • Sodium and potassium are soft and silvery white metals.
  • Sodium and potassium in air get tarnished due to the formation of a layer of oxide or carbonates.
  • Sodium and potassium burn in dry oxygen (excess) gives peroxides.
  • Sodium and potassium are kept under kerosene to avoid contact with air and moisture.
Which of the following properties show a similar trend on moving Li to Cs within the group?
  • Ionic mobility in aqueous solution
  • Reactivity towards water.
  • Solubility of bromide salt.
  • Thermal stability of carbonate salt
The product obtained on fusion of $$BaS{ O }_{ 4 }$$ and $${ Na }_{ 2 }C{ O }_{ 3 }$$ is:
  • $$BaC{ O }_{ 3 }$$
  • $$BaO$$
  • $$Ba{ \left( OH \right) }_{ 2 }$$
  • $$BaHS{ O }_{ 4 }$$
Which of the following is not a alkali metal?
  • sodium
  • potassium
  • gold
  • lithium
Which statement is correct regarding the diagonal relationship between the Al and Be?
  • $$BeO$$ and $$Al_2O_3$$ are amphoteric in nature
  • Both carbide on hydrolysis produce same gas
  • Both can form complex
  • Both have nearly close m.p.
Which of the following statement(s) is/are incorrect?
  • Magnesium may be extracted by self reduction method.
  • Down's process is used to extract magnesium from sea water.
  • Magnalium is an alloy of magnesium.
  • Formula of epsom salt is $$MgSO_4.6H_2O$$.
Which of the following does/do not impact characteristic colour to the flame?
  • $$MgSO_4$$
  • $$CaCl_2$$
  • $$Sr(NO_3)_2$$
  • $$BeCl_2$$
$$CaCl_2$$ is preferred over $$NaCl$$ for clearing ice on roads on particularly in very cold countries. This is because:
  • $$CaCl_2$$ is not soluble in $$H_2O$$ than $$NaCl$$
  • $$CaCl_2$$ is hygroscopic but $$NaCl$$ is not
  • eutectic mixture of $$CaCl_2$$/$$H_2O$$ freezes at $$-55^oC$$ while that of $$NaCl$$/$$H_2O$$ freezes at $$-18^oC$$
  • $$NaCl$$ makes the road slippery but $$CaCl_2$$ does not
What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) form the reduction of boron trichloride by hydrogen:
  • 89.6 L
  • 67.2 L
  • 44.8 L
  • 22.4 L
Select the incorrect statement(s) :
  • Magnesium can be burnt in the atmosphere of $$CO_2$$ and $$SO_2$$
  • Magnesium reacts with alkyl halides to form Grignard's reagent
  • Out of $$Mg$$ and $$Ca$$, only $$Mg$$ reacts with $$N_2$$ to form magnesium nitride
  • Calcium is less reactive than magnesium
 XY 
 Liquid sodium metalBreathing apparatus submarine 
 PotassiumExplosive
Potassium nitrate  Coolant in nuclear reaction 
 Potassium superoxideSoft soap 
Match the compounds/metal in(X) with their used in (Y). hence correct order is.
  • A-I, B-III, C-II, D-IV
  • A-III, B-IV, C-II, D-I
  • A-II, B-I, C-III, D-IV
  • A-IV, B-II, C-III, D-I
Consider the following reaction:
$$M+O_2 \rightarrow MO_2$$
$$M$$ is an alkali metal$$MO_2$$ is a stable superoxide
  • $$M$$ can not be $$Li$$ and $$Na$$
  • $$M$$ can not be $$Cs$$ and $$Rb$$
  • $$M$$ can not be $$Li$$ and $$Rb$$
  • None of these
The correct increasing order of basic nature among Be, Mg, Ca and Sr is :
  • $$Be < Ca < Mg < Sr$$
  • $$Be < Mg < Sr < Ca$$
  • $$Be < Mg < Ca < Sr$$
  • $$Ca < Sr < Be < Mg$$
Which one of the following is correct with respect to molar ionic conductance of ions in aqueous solution?
  • $$Li^{+}\, <\, Na^{+}\, <\, K^{+}\, <\, Rb^{+}$$
  • $$Rb^{+}\, <\, K^{+}\, <\, Na^{+}\, <\, Li^{+}$$
  • $$Sr^{2+}\, <\, Ca^{2+}\, <\, Mg^{2+}\, <\, Be^{2+}$$
  • $$Na^{+}\, <\, K^{+}\, <\, Li^{+}\, <\, Rb^{+}$$
The correct increasing order of melting point of alkali metal carbonates is:
  • $$Cs_2CO_3\, <\, Na_2CO_3\, <\, K_2CO_3\, <\, Rb_2CO_3\, <\, Li_2CO_3$$
  • $$Li_2CO_3\, <\, Na_2CO_3\, <\, K_2CO_3\, <\, Rb_2CO_3\, <\, Cs_2CO_3$$
  • $$Li_2CO_3\, <\, Rb_2CO_3\, <\, K_2CO_3\, <\, Na_2CO_3\, <\, Cs_2CO_3$$
  • None of these
Recently, sodium naphthalenide ($$C_{10}H_8Na$$) has been used as reductant in complex formation. $$C_{10}H_8Na$$ is : 
  • paramagnetic
  • deep-green in colour
  • diamagnetic
  • colourless
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.
  • Nitrates of both $$Li$$ and $$Mg$$ yield $${ NO }_{ 2 }$$ and $${ O }_{ 2 }$$ on heating.
Which is/are true statement(s)?
  • The heats of hydration of the dispositive alkaline earth metal ions decrease with an increase in their ionic size
  • Hydration of alkali metal ion is less than that of IIA.
  • Alkaline earth metal ions, because of their much larger charge to size ratio exert a much stronger electrostatic attraction on the oxygen of water molecule surrounding them
  • None of the above statements is correct
$$Li(s)\, \rightarrow\, Li^{+}(aq)\, +\, e^{-}$$ involved :
  • sublimation
  • ionization
  • hydration
  • all of these
Ripening of fruits can be caried out in presence of :
  • $$Na_2SO_4$$
  • $$NaCl$$
  • $$CaCl_2$$
  • $$CaC_2$$
Select correct statement(s).
  • $$Mg^{2+}$$ ions are necessary for the activation of phosphate transfer enzymes.
  • Mg is present in chlorophyll of green plants.
  • Mg is present in chlorophyll used in photosynthesis in green plants.
  • All the above are correct statements
Which of the following is/are correct statement(s)?
  • $$Ca_3(PO_4)_2$$ in part of bones
  • $$3Ca_3(PO_4).CaF_2$$ is part of enamel on teeth
  • $$Ca^{2+}$$ ions are important in blood clotting
  • All of the above are correct
 Hydration energy
$${\Delta H}_{hydra}.(kJ \,mol^{-1})$$		Lattice energy 
$${\Delta H_u}(kJ \,mol^{-1})$$
 $$Li^+$$ -499LiCl-840 
 $$Na^+$$-390NaCl-776 
 $$K^+$$-305KCl-703 
 $$Cl^-$$-382 
Which salt can be used to control humidity?
  • $$LiCl$$
  • $$NaCl$$
  • $$KCl$$
  • None of these
Burning of Mg is extinguished by :
  • throwing $$N_2$$ liquid
  • throwing sand
  • throwing ice
  • throwing water
In the mineral, barium ion can be identified by :
  • green colour in ame
  • yellow precipitate with $$Cr{ O }_{ 4 }^{ 2- }$$solution
  • white precipitate with $$S{ O }_{ 4 }^{ 2- }$$
  • all of the above
The first ionization potentials ($$eV$$) of $$Be$$ and $$B$$ respectively are:
  • $$8.29, 9.32$$
  • $$9.32, 9.32$$
  • $$8.29, 8,29$$
  • $$9.32,8.29$$
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