CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 13 - MCQExams.com

Which of the following compounds is (are) not soluble in water?
  • $$Li_{2}CO_{3}$$
  • $$LiF$$
  • $$Li_{3}PO_{4}$$
  • $$All\ of\ these$$
Which of the following species does not exist under normal conditions?
  • $$ Be_2^+ $$
  • $$ Be_2 $$
  • $$ B_2 $$
  • $$ Li_2 $$
Which of the following increases in magnitude as the atomic number of alkali metals increases?
  • Electronegativity
  • First ionisation potential
  • Ionic radius
  • Melting point
Which of the following compound is used in gun powder?
  • $$LiNO_{3}$$
  • $$NaNO_{3}$$
  • $$Pb(NO_{3})_{2}$$
  • $$KNO_{3}$$
Sodium is heated in air at $$350^oC$$ to form $$X, X$$ absorbs $$CO_2$$ and forms sodium carbonate and $$Y$$. Which of the following is $$Y$$?
  • $$H_2$$
  • $$O_2$$
  • $$H_2O_2$$
  • $$O_3$$
Match the compounds given in $$(X)$$ with their uses in $$(Y)$$

$$X$$$$Y$$
A.$$NaOH$$1.Glass
B.$$Na_{2}S_{2}O_{3}$$2.Germicide
C.$$NaCN$$3.Antichlor
D.$$Na_{2}CO_{3}$$4.Soap
  • $$A (4), B(3), C(2), D(1)$$
  • $$A (3), B (4), C(1), D(2)$$
  • $$A(2), B(3), C(4), D(1)$$
  • $$A(1), B(2), C(3), D(4)$$
Which of the following does not illustrate the anomalous behaviour of lithium?
  • Lithium reacts with nitrogen to form a nitride
  • Lithium is the hardest alkali metal
  • Lithium reacts with oxygen to form normal oxide only
  • Lithium carbonate decomposes on heating
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is
  • $$B$$
  • $$Al$$
  • $$Ga$$
  • $$In$$
The set representing the correct order of ionic radius is: 
  • $$ Li^+ > Be^{2+} > Na^{+} > Mg^{2+} $$
  • $$ Na^+ > Li^+ > Mg^{2+} > Be^{2+} $$
  • $$ Li^+ > Na^+ > Mg^{2+ } > Be^{2+} $$
  • $$ Mg^{2+} > Be^{2+} > Li^+ > Na^+$$
Which among the following is least soluble in water?
  • $$NaF$$
  • $$LiF$$
  • $$KF$$
  • $$RbF$$
Beryllium and aluminium exhibit many properties that are similar. But the two element differ in:
  • Forming covalent halides
  • Forming polymeric hydrides
  • Exhibiting maximum covalency in compounds
  • Exhibiting amphoteric nature in their oxides
Pick out statement (s) which is (are) not true about the diagonal relationship of $$Li$$ and $$Mg$$:
$$A.$$ Polarising powers of $$Li^{+}$$ and $$Mg^{2+}$$ ions are almost same.
$$B.$$ Like $$Li, Mg$$ decomposes water very fast.
$$C.$$ $$LiCl$$ and $$MgCl_{2}$$ are deliquescent.
$$D.$$ Like $$Li, Mg$$ readily reacts with liquid bromine at ordinary temperature.
  • $$A$$ and $$D$$
  • $$B$$ and $$C$$
  • Only $$B$$
  • $$B$$ and $$D$$
The correct order if mobility of alkali metal ions in aqueous solution is:
  • $$K^{+}>Rb^{+}>Na^{+}>Li^{+}$$
  • $$Rb^{+}>K^{+}>Na^{+}>Li^{+}$$
  • $$Li^{+}>Na^{+}>K^{+}>Rb^{+}$$
  • $$Na^{+}>K^{+}>Rb^{+}>Li^{+}$$
Alkaline earth metals are characterised by:
  • $$ns^2$$ electronic configuration
  • electropositive nature
  • reducing nature
  • found in nature
Consider the cations, $$Li^+, Be^{2+}, K^+ $$ and $$Al^{3+}$$. The largest and the smallest ions from this list are respectively:
  • $$K^+$$ and $$Li^+$$
  • $$Al^{3+}$$ and $$Be^{2+}$$
  • $$Mg^{2+}$$ and $$Li^+$$
  • $$K^+$$ and $$Be^{2+}$$
A metal $$M$$ readily forms water soluble sulphate and water insoluble hydroxide, $$M(OH)_2$$. Its oxide $$MO$$ is amphoteric, hard and having high melting point. The alkaline earth metal is :
  • $$Mg$$
  • $$Ca$$
  • $$Be$$
  • $$Ba$$
The ion having maximum value of hydration energy is:
  • $$Li^+$$
  • $$Na^+$$
  • $$K^+$$
  • $$Cs^+$$
Which of the following statement(s) is/are INCORRECT ? 
  • Generally the radius trend and the ionization energy trend across a period are opposite.
  • Metallic and covalent radii of potassium are 2.3 $$A ^0$$and 2.03 $$A^0$$  respectively.
  • Amongst $$ Li^{-}$$, $$ B^{-}$$ and $$ C^{-}$$, $$ Li^{-}$$ is least stable ion
  • Atomic and ionic radii of Niobium and Tantalum are almost same.
Which of the following statements about alkaline earth metals are correct?
  • Hydration energy of $$Sr^{2+}$$ is greater then that of $$Be^{2+}$$
  • $$CaCO_3$$ decomposes at a higher temperature than $$BaCO_3$$
  • $$Ba(OH)_2$$ is stronger base than $$Mg(OH)_2$$
  • $$SrSO_4$$ is less soluble in water than $$CaSO_4$$
Which of the following statement (s) is/are true for the solutions of alkali metals and alkaline earth metals in ammonia $$(\ell)?$$
  • Concentrated solutions of alkali metals in ammonia are copper - bronzed coloured and have a metallic lusture.
  • Dilute solutions of alkaline earth metals are deep bule-black in coldur due to the spectrum from the solvated electron.
  • Concentrated solutions of the alkaline earth metals in ammonia are bronze coloured.
  • Evaporation of the ammonia from solutions of alkali metals yields the metal, but with alkaline earth metals evaporation of ammonia gives hexammoniates of the metals.
Which of the following statements is true?
  • $$BeO$$ and $$Be\left(OH\right)_{2}$$ 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 $$BeH_{2}$$
If $$Na$$ is heated in presence of air, it forms 
  • $$Na_2CO_3$$
  • $$Na_2O_2$$
  • $$Na_2O$$
  • Both $$ (B)$$ and $$(C)$$
Sodium metal cannot be stored under 
  • benzene
  • kerosene
  • alcohol
  • toluene
Magnesium is a non-combustible metal.
  • True
  • False
Point out of the incorrect statements regarding $$Be$$ (Group $$IIA$$)
  • It forms an ionic carbide
  • Its carbonates decomposes on heating
  • Its halides are covalent
  • It is easily attacked by water
Write 'true ' or 'false' for the following statements : 
Sodium can be cut with a knife.
  • True
  • False
Which of the following has maximum solubility in water?
  • NaCl
  • KCl
  • RbCl
  • LiCl
The atomic radii of alkali metals $$(M)$$ lie in the order $$Li < Na < K < Rb$$ but the radii of $$M^{+}$$ ions in aqueous solution lie in the reverse order $$Li^{+} > Na^{+} > K^{+} > Rb^{+}$$. What is the reason for this reverse order (on going from $$Li$$ to $$Rb$$)?
  • Gradual increase in ionisation energy
  • Increasing weakness of the metallic bond
  • Increasing electropostive character
  • Decreasing degree of hydration
Which of the following shows highest oxidation state of $$+7$$?
  • $$Co$$
  • $$Cr$$
  • $$Mn$$
  • $$v$$
Beryllium differs from the rest of the alkaline earth metals on account of its small size, and high electronegativity as compared to other alkaline earth metals. However, it shows a diagonal relationship with aluminium of the next period. Due to the high polarising power of $$Be^{2+}$$ and $$Al^{3+}$$ their compounds develop a covalent nature.

Which of the following is not a similarity of beryllium with aluminium ?
  • It becomes passive when treated with conc. $$HNO_3$$.
  • It forms polymeric covalent hydrides.
  • Carbonates of Be is extremely stable.
  • Salts of Be do not impart colour to the flame.
Paramagntism is common in:
  • s-block elements
  • p-block elements
  • f-block elements
  • d-block elements
The compounds of alkaline earth metals have the following magnetic nature are:
  • Diamagnetic
  • Paramagnetic
  • Ferromagnetic
  • Antiferromagnetic
Property of alkaline earth metals which increases with their atomic number is: 
  • Ionization energy
  • solubility of their hydroxides
  • solubility if their sulphates
  • electronegativity
Which of the following pairs do not have the same nature?
  • $$B(OH)_{3}, H_{3}PO_{3}$$
  • $$Be(OH)_{2}, Al(OH)_{3}$$
  • $$B(OH)_{3}, Al(OH)_{3}$$
  • $$Mg(OH)_{2}, NaOH$$
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