CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 2 - MCQExams.com

Which element has valency equal to its group number?
  • Sodium
  • aluminium
  • oxygen
  • carbon
The metal used in solar cells is:
  • Na
  • Li
  • Cs
  • Mg
The lightest metal among the following is:
  • Cs
  • Be
  • Na
  • Li
Li shows diagonal relationship with:
  • Mg
  • Be
  • Al
  • B
The least electropositive alkali metal is:
  • Sodium
  • Lithium
  • Potassium
  • Caesium
The softness of group $$IA$$ metals increases down the group because:
  • the metallic bond strength decreases with increase in atomic size
  • ionisation potential decreases from $$Li$$ to $$Cs$$
  • electronegativity increases from $$Li$$ to $$Cs$$
  • atomic size decreases from $$Li$$ to $$Cs$$

STATEMENT-1 : $$Be$$ and $$Al$$ form amphoteric oxides.
STATEMENT-2 : $$Be$$ and $$Al$$ are metalloids.
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
  • STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a 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 undergoes decomposition on heating?
  • $$Li_{2}CO_{3}$$
  • $$K_{2}CO_{3}$$
  • $$Na_{2}CO_{3}$$
  • $$Rb_{2}CO_{3}$$
Which one of the following has a polarizing power close to that of Mg?
  • Li
  • Na
  • K
  • Rb
Match compounds given in List 1 with their use in List 2

 List 1List 2 
A. Liquid sodium metalbreathing apparatus submarine
B. Potassiumexplosive stearate
C. Potassium nitratecoolant in the nuclear reactor
D. Potassium superoxidesoft soap
  • A-1; B-2; C-3; D-4
  • A-3; B-4; C-2; D-1
  • A-1; B-4; C-2; D-3
  • A-4; B-3; C-2; D-1
Which of the following property of alkali metals increases with increase in atomic number?
  • Ionic radius
  • Electronegativity
  • Melting point
  • First ionisation potential
Metals having $$ns^{1}$$ as the valence electronicconfiguration :
  • act as strong oxidizing reagent
  • are highly electronegative
  • are highly electropostive
  • have a first ionization potential of more than 10 eV/atom
What is the correct increasing order of solubility of the following salt?

$$NaHCO_3,\  KHCO_3,\ Mg(HCO_3)_2,\ Ca(HCO_3)_2$$ 
  • $$KHCO_3<Mg(HCO_3)_2<Ca(HCO_3)_2<NaHCO_3$$
  • $$Mg(HCO_3)_2<Ca(HCO_3)_2<NaHCO_3<KHCO_3$$
  • $$NaHCO_3<KHCO_3<Mg(HCO_3)_2<Ca(HCO_3)_2$$
  • $$Ca(HCO_3)_2<NaHCO_3<KHCO_3<Mg(HCO_3)_2$$
$$Li,\ Na$$ and $$K$$ burn in excess of air to form:
  • $$Li_{2}O,\ Na_{2}O$$ and $$K_{2}O$$
  • $$Li_{2}O,\ Na_{2}O_{2}$$ and $$K_{2}O$$
  • $$Li_{2}O,\ Na_{2}O_{2}$$ and $$KO_{2}$$
  • $$Li_{2}O,\ NaO_{2}$$ and $$K_{2}O_{2}$$
Which of the following can form a super oxide very easily?
  • Sodium
  • Potassium
  • Caesium
  • Lithium
Sodium burns in excess air to give mainly:
  • $$Na_{2}O$$
  • $$NaO_{2}$$
  • $$Na_{2}O_{2}$$
  • $$NaH$$
When Na and Li are burnt in dry air, we get :
  • $$NaOH$$, $$Na_{2}O$$, $$Li_{2}O$$
  • $$Na_{2}O$$, $$Li_{2}O$$
  • $$Na_{2}O$$, $$Li_{2}O$$, $$Li_{3}N$$, $$NH_{3}$$
  • $$Na_{2}O_{2}$$, $$Li_{3}N$$, $$Li_{2}O$$
Pick out the false statement :
  • the electropostive character of alkali metals decreases with increases in atomic number
  • lithium is a hard metal and cannot be cut with a knife
  • Alkali metals are strong reducing agents
  • the electro-negativities of all alkali metals remain the same.
The sulphate of which metal given below has the highest solubility in water?
  • $$Ca$$
  • $$Ba$$
  • $$Sr$$
  • $$Mg$$
Which of the following statement is correct?
  • Lithium carbonate is soluble in water.
  • Carbonates of Ca and Ba are soluble in water.
  • Carbonates of $$Na^{+},\ K^{+}$$ and $$NH_4^{+}$$ are soluble in water.
  • All the above.
Alkali metal when exposed to air tarnish quickly due to the ________.
  • formation of their hydroxides
  • formation of their carbonates
  • formation of their oxides
  • all the above
The ion helpful for controlling heart beating and muscle contraction is:
  • $$Mg^{2+}$$
  • $$Na^{+}$$
  • $$K^{+}$$
  • $$Ca^{2+}$$
The enamel on teeth contains:
  • fluorapatite
  • chlorapatite
  • apatite
  • calcium monohydrogen phosphate
Chlorophyll, the green component of plants contains:
  • $$Ca^{2+}$$
  • $$Be^{2+}$$
  • $$Mg^{2+}$$
  • $$Ba^{2+}$$
The alkaline earth metal whose carbonate has no natural occurrence is:
  • Ba
  • Ca
  • Mg
  • Be
A burning strip of $$Mg$$ is introduced into a jar containing a gas. After some time, the walls of the container are coated with carbon. The gas in the container is :
  • $$O_{2}$$
  • $$N_{2}$$
  • $$CO_{2}$$
  • $$H_{2}O$$
Which of the following metals cannot give flame
tests?
  • Be
  • Na
  • K
  • Ca
Which of the following is the strongest reducing agent?
  • Be
  • Ba
  • Ca
  • Mg
Which of the following salt gives a crimson red colour in flame test?
  • $$BaCl_{2}$$
  • $$CaCl_{2}$$
  • $$BeCl_{2}$$
  • $$SrCl_{2}$$
The metal which gives brick red colour in flame test is :
  • barium
  • calcium
  • strontium
  • radium
Which of the following statement is correct?
I) Atomic radius of Na is greater than that of Mg.
II) Metallic bond in Mg is stronger than the metallic bond in Na.
III) Melting and boiling points of Mg are greater than that of Ca.
IV) Mg and Ca are most abundant elements among the alkaline earth metals.
  • III, IV
  • I, II, IV
  • II, IV
  • I, IV
The thermal stability of $$BaCO_{3}, CaCO_{3}$$ and $$MgCO_{3}$$ is:
  • $$CaCO_{3} > MgCO_{3} > BaCO_{3}$$
  • $$MgCO_{3}> CaCO_{3} > BaCO_{3}$$
  • $$BaCO_{3} > MgCO_{3} > CaCO_{3}$$
  • $$BaCO_{3} > CaCO_{3} > MgCO_{3}$$
Sulphate of an alkaline earth metal which crystalizes without water of hydration is?
  • $$Be^{2+}$$
  • $$Mg^{2+}$$
  • $$Ca^{2+}$$
  • $$Sr^{2+}$$
Which of the following does not form peroxides?
  • $$Ba$$
  • $$Be$$
  • $$Ca$$
  • $$Mg$$
Assertion(A) : Beryllium and magnesium do not impart characteristic colour in flame.
Reasoning(R) : Both Beryllium and magnesium have high I.E.
  • Both Assertion and Reason are true and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are true but Reason is not a correct explanation of Assertion
  • Assertion is true but Reason is false
  • Both Assertion and Reason are false
A substance X, which is an oxide of a group 2 element, is used intensively in the cement industry. This element is present in bones also. On treatment with water, it forms a solution which turns red litmus blue. Identify X :
  • Calcium oxide
  • Magnesium oxide
  • Beryllium oxide
  • Barium oxide
Beryllium shows diagonal relationship with:
  • B
  • Mg
  • Al
  • Ne
Select the correct order of density.
  • Na > K
  • Na < K
  • Mg > Ca
  • Mg < Ca
Which of the following statements is/are not true about the diagonal relationship of $$Be$$ and $$Al$$?
a) Both react with $$NaOH$$ to liberate hydrogen.
b) Their oxides are basic.
c) They become passive by concentrated  $$HNO_{3}$$.
d) Their carbides give acetylene on treatment with water.
  • Only $$a$$
  • $$b$$ and $$c$$
  • $$a$$ and $$d$$
  • $$b$$ and $$d$$
Metal  $${\text{M + air}}\xrightarrow{\Delta }{\text{A}}\xrightarrow{{{{\text{H}}_{\text{2}}}{\text{O}}}}B\xrightarrow{{{\text{HCl}}}}{\text{White fumes}}$$;  Metal $$M$$ can be:
  • $$\rm{ Li,\, Mg }$$
  • $$\rm{ Na,\, K }$$ or $$\rm{Mg}$$
  • $$\rm{ Li,\, Al }$$ or $$\rm{ K }$$
  • $$\rm{ Li,\, Na }$$ or $$\rm{ K }$$
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy?
  • $$CaSO_{4}$$
  • $$BeSO_{4}$$
  • $$BaSO_{4}$$
  • $$SrSO_{4}$$
Which one of the following species does not exist under normal conditions?
  • $${Be_{2}}^{+}$$
  • $$Be_{2}$$
  • $$B_{2}$$
  • L$$i_{2}$$
Mg is present in 
  • Chlorophyl
  • Haemoglobin
  • Vitamin-12
  • Vitamin-B
Alkaline earth metal(s) which does (do) not
impart colour to the flame is (are):
  • Be
  • Mg
  • Ca
  • Sr
Sodium and potassium react with water much more vigorously than lithium because:
  • sodium and potassium have high values of hydration energy as compared to that of lithium
  • sodium and potassium have higher melting point than that of lithium
  • sodium and potassium have lower melting point than that of lithium
  • sodium and potassium have lower hydration energy than that of lithium
The colour of transition metal compound is due to :
  • complete $$n-subshell$$.
  • small size metal ion.
  • incomplete $$(n-1)d-subshell$$.
  • none of these.
Alkaline earth metal nitrates on heating decompose to give:
  • $$M(NO_2)_2$$ and $$O_2$$ only
  • $$MO, N_2$$ and $$O_2$$
  • $$MO, NO_2$$ and $$O_2$$
  • $$MO$$ and $$NO_2$$ only
Consider the following statements and arrange in the order of true/false as given in the codes.
$$S_1$$: Sodium amalgam reacts with hot water and produces sodium hydroxide and hydrogen gas.
$$S_2$$: Sodium is more reactive than potassium.
$$S_3$$: Alkaline earth metals dissolve in liquid ammonia to give deep blue-black solutions which are conducting.
$$S_4$$: Alkaline earth metal salts have more number of water molecules as compared to those of alkali metal salts.
  • TTFF
  • TFTT
  • FTTF
  • TFFT
Property of all the alkaline earth metals that increases with their atomic number is:
  • solubility of their carbonates
  • thermal stability of their sulphates
  • ionisation energy
  • electronegativity
The energy of an electron in a particular orbit of single electron species of beryllium is the same as the energy of an electron in the ground state of a hydrogen atom. Identify the orbit of beryllium.
  • 1
  • 2
  • 3
  • 4
0:0:1


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