CBSE Questions for Class 11 Medical Chemistry The S-Block Elements Quiz 1 - MCQExams.com

Which of the following is organometalic compound 
  • Methyl lithium
  • Lithium methoxide
  • Lithium dimethyl amide
  • Lithium acetate
Incorrect statement about given carbohydrate is
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  • Above compound is a reducing sugar
  • Above compound undergo mutarotation
  • Above compound is a non-reducing sugar
  • Above compound has a glycosidic linkage
Which of the following product is obtained when bleaching powder is distilled with acetone?
  • $$CCl_4$$
  • $$CH_2Cl_2$$
  • $$CH_3 -CH_3$$
  • none of the above
Lithium react less vigorously with water than other metals. Give reason behind it.
  • Lithium has most negative $$E^\ominus $$ value
  • Lithium has small size and very high hydration energy.
  • Lithium has least negative $$E^\ominus $$ value
  • Both (a) and (b)
Diagonal relationship is found in between 
  • $$Be-Al$$
  • $$B-C$$
  • $$Li-Mg$$
  • $$A\ and\ C\ both$$
The alkaline earth metal ion present in chlorophyll is
  • $$Ca$$
  • $$Mg$$
  • $$Be$$
  • $$Ba$$
Among the alkaline earth metals, the element forming predominantly covalent compounds is
  • Be
  • Ba
  • Ca
  • Mg
The ionization energy of a hydrogen atom is 13.6eV. The energy of the third-lowest electronic level in doubly ionized lithium (Z=3) is:
  • -28.7eV
  • -54.4eV
  • -122.4eV
  • -13.6eV
Correct order is :
  • $$\mathrm { MgO } < \mathrm { NiO } < \mathrm { K } _ { 2 } \mathrm { O } < \mathrm { CS } _ { 2 } {O } $$ (basic strength )
  • $$\mathrm { Cs } ^ { + } < \mathrm { K } ^ { + } < \mathrm { Mg } ^ { 2 + } < \mathrm { Be } ^ { 2 + }$$ (ionic moblity in aqueous
    solution)
  • $$\mathrm { Li } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } < \mathrm { K } _ { 2 } \mathrm { CO } _ { 3 }$$ (solubility order)
  • $$\mathrm { NH } _ { 3 } < \mathrm { PH } _ { 3 } < \mathrm { AsH } _ { 3 }$$ (thermal stability)
The melting point of lithium (181$$^\circ$$C) is just double the melting point of sodium (98$$^\circ$$C) because
  • down the group, the hydration energy decreases
  • down the group, the ionization energy decreases
  • down the group, the cohesive energy decreases
  • None of these
Which of the following are arranged in increasing order of solubilities? 
  • $$CaCO_3 < KHCO_3 < NaHCO_3$$
  • $$NaHCO_3 < KHCO_3 < CaCO_3$$
  • $$KHCO_3 < NaHCO_3 < CaCO_3$$
  • $$CaCO_3 < NaHCO_3 < KHCO_3$$
Incorrect statement is:
  • $$NaHCO_{3}$$ and $$KHCO_{3}$$ have same crystal structure
  • On heating $$LiNO_{3}$$ decomposes into $$LiO_{2}$$ and $$NO_{2}$$
  • Among alkali metals, $$Li$$ metal impart red colour to flame
  • $$Li_{2}SO_{4}$$ does not from alum
Which of the following carbonate is not stable to heat.
  • $$Li_2CO_3$$
  • $$Na_2CO_3$$
  • $$K_2CO_3$$
  • $$Rb_2CO_3$$
Which element is most alkaline :
  • F
  • CI
  • Br
  • I
Which of the following statements is false ?
  • $${\text{M}}{{\text{g}}^{{\text{2 + }}}}$$ ion form a complex with ATP
  • $${\text{C}}{{\text{a}}^{{\text{2 + }}}}$$ on are important in blood clotting
  • $${\text{C}}{{\text{a}}^{{\text{2 + }}}}$$ ion are not important in maintaining the regular beating of the heart.
  • $${\text{M}}{{\text{g}}^{{\text{2 + }}}}$$ ion are important in the green parts of plants.
Which of the following is a binary compound?
  • $${ K }_{ 2 }C{ O }_{ 3 }$$
  • $$HCl{ O }_{ 4 }$$
  • $${ H }_{ 2 }O$$
  • $${ H }_{ 2 }S{ O }_{ 4 }$$
Which  of the following statement is false?
  • $$Mg^{2+}$$ ion forms a complex with $$ATP$$
  • $$Ca^{2+}$$ ions are important in blood clotting.
  • $$Ca^{2+}$$ ions are not important in maintaining the regular beating of the hear
  • $$Mg^{2+}$$ ions are important in the green parts of plants
Passivity is exhibited by: $$A) Be , B) Mg, C) Al ,D) B$$
  • $$A, B$$
  • $$B, C$$
  • $$A, C$$
  • $$B, D$$
Which of the following enzymes contain $$Mg^{2+}$$
ions?
  • Phosphohydrylase
  • Zymase
  • Phosphotransferase
  • 1 and 3
The polarising power of $$Be^{2+}$$ is nearly same as that of:
  • $$Ba^{2+}$$
  • $$Mg^{2+}$$
  • $$Al^{3+}$$
  • $$B^{3+}$$
Bones and teeth contain:
  • Calcium dihydrogen phosphate
  • Apatite
  • Calcium phosphide
  • None of the above
Aluminium forms aluminates like beryllium forms:
  • fluorides
  • nitrates
  • beryllates
  • silicates
The polarising power of $$Mg^{2+}$$ is nearly same as that of:
  • $$Li^{+}$$
  • $$Ba^{2+}$$
  • $$Al^{3+}$$
  • all of the above
Alkaline earth metals have only positive oxidation state. This is due to their:
  • high melting points
  • high electronegativity
  • softness
  • low ionization potential
The main oxides formed on combustion of $$Li, Na$$ and $$K$$ in excess of air are, respectively:
  • $$Li{O}_{2}, {Na}_{2}{O}_{2}$$ and $${K}_{2}O$$
  • $${Li}_{2}{O}_{2}, {Na}_{2}{O}_{2}$$ and $$K{O}_{2}$$
  • $${Li}_{2}O, {Na}_{2}{O}_{2}$$ and $$K{O}_{2}$$
  • $${Li}_{2}O, {Na}_{2}O$$ and $$K{O}_{2}$$
The element having greatest difference between its first and second ionization energies is:
  • $$Ca$$
  • $$K$$
  • $$Ba$$
  • $$Se$$
The correct sequence of thermal stability of the following carbonates is: 
  • $$BaCO_3 < CaCO_3 < SrCO_3 < MgCO_3$$
  • $$MgCO_3 < CaCO_3 < SrCO_3 < BaCO_3$$
  • $$BaCO_3 < SrCO_3 < CaCO_3 < MgCO_3$$
  • $$MgCO_3 < SrCO_3 < CaCO_3 < BaCO_3$$
Both lithium and magnesium display several similar properties due to the diagonal relationships however, the one which is incorrect is:
  • Both form soluble bicarbonates.
  • Both form nitrides.
  • Nitrates of both $$Li$$ and $$Mg$$ yield $$NO_2$$ and $$O_2$$ on heating.
  • Both form basic carbonates.
The structure of beryllium chloride in the solid state and vapour phase, respectively, are:
  • chain and dimeric
  • chain and chain
  • dimeric and dimeric
  • dimeric and chain
The oxide of an element whose electronic configuration $$1s^22s^22p^63s^1$$ is:
  • Neutral
  • Atmospharic
  • Basic
  • Acidic
The INCORRECT statement is :
  • Lithium is least reactive with water among the alkali metals.
  • $$LiCl$$ crystallises from aqueous solution as $$LiCl.2H_2O$$.
  • Lithium is the strongest reducing agent among the alkali metals.
  • $$LiNO_3$$ decomposes on heating to give $$LiNO_2$$ and $$O_2$$
The amphoteric hydroxide is :
  • $$Ca(OH)_2$$
  • $$Be(OH)_2$$
  • $$Sr(OH)_2$$
  • $$Mg(OH)_2$$
Among the statements $$(a)-(d)$$, the correct ones are :
(a) Lithium has the highest hydration enthalpy among the alkali metals.
(b) Lithium chloride is insoluble in pyridine.
(c) Lithium cannot form ethynide upon its reaction with ethyne.
(d) Both lithium and magnesium react slowly with $$H_2O$$.
  • (b) and (c) only
  • (a), (b) and (d) only
  • (a), (c) and (d) only
  • (a) and (d) only
All of the following share the same crystal structure except:
  • $$RbCl$$
  • $$NaCl$$
  • $$LiCl$$
  • $$KCl$$
Ionic mobility of which of the following alkali metal ions is the lowest when aqueous solution of their salts are put under an electric field?
  • $$Li$$
  • $$Na$$
  • $$K$$
  • $$Rb$$
What is the value of electron gain enthalpy of $${Na}^{+}$$ if $$I{E}_{1}$$ of $$NA = 5.1  eV$$ ?
  • $$-5.1 eV$$
  • $$-10.2 eV$$
  • $$+2.55 eV$$
  • $$+10.2 eV$$
Beryllium and aluminum exhibit many properties which are similar. But the two elements differ in:
  • maximum covalency in compounds
  • exhibiting amphoteric nature in their oxides
  • forming covalent halides
  • forming polymeric hydrides
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Formation of polyethylene from calcium carbide takes place is follows :

$$CaC_2 + 2H_2O \rightarrow Ca(OH)_2 + C_2H_2$$
$$C_2H_2 +H_2 \rightarrow C_2H_4$$
$$nC_2H_4 \rightarrow +CH_2 - CH_2 +n$$

The amount of polyethylene obtained from 64.0 kg of $$CaC_2$$ is: 
  • 27 kg
  • 24 kg
  • 22 kg
  • 28 kg
The correct order of solubility of the following compound in water is: 
  • $$Ba(OH)_2 < Mg(OH)_2$$
  • $$BaCO_3 > CaCO_3$$
  • $$Ca(OH)_2=Mg(OH)_2$$
  • $$CaSO_4 < MgSO_4$$
Read the assertion and reason carefully and answer the question on the basis of the following options. You have to select the one that best describes the two statements.

Assertion: Potassium and caesium are used in photoelectric cells.
Reason: Potassium and caesium emit electrons on exposure to light.
  • If both assertion and reason are true and the reason is a correct explanation of the assertion
  • If both assertion and reason are true but reason is not a correct explanation of the assertion
  • If the assertion is true but reason is false
  • If both the assertion and reason are false
  • If the assertion is false but the reason is true
Which of the following has the highest tendency to give the following reaction?
$${ M }_{ (g) }^{ + }\xrightarrow [ medium ]{ aqueous } { M }_{ (aq) }^{ + }$$
  • $$Na$$
  • $$Li$$
  • $$K$$
  • $$Rb$$
Sodium hydroxide reacts with $$SO_2$$ in aqueous medium to give:
  • $$\displaystyle { NaHSO }_{ 3 }$$
  • $$\displaystyle { Na }_{ 2 }{ S }_{ 2 }{ O }_{ 3 }$$
  • $$\displaystyle NaH{ SO }_{ 4 }$$
  • $$\displaystyle { Na }_{ 2 }{ SO }_{ 3 }$$
What is the main reason of diagonal relationship between lithium and magnesium?
  • Electronegativity remains constant the same on moving parallel.
  • Electronegativity remains constant the same on moving horizontally.
  • Electronegativity remains constant the same on moving diagonally.
  • Electronegativity remains constant the same on moving vertically.
The most active metal is:
  • $$Be$$
  • $$Ca$$
  • $$Ba$$
  • $$Mg$$
A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the $$\alpha $$-particles is succession. The group of the periodic table to which the resulting daughter element would belong is :-
  • Gr. 4
  • Gr.6
  • Gr.16
  • Gr.14
Among the alkali metals, the metal with the highest ionisation potential is:
  • Na
  • Li
  • Rb
  • Cs
Radium is a harmful element which emits radiation.
  • True
  • False
Diagonal relationship of elements in due to same:
  • size
  • mass number
  • atomic number
  • electron affinity
The correct sequence of increasing melting point of $$BeCl_{2},MgCl_{2},CaCl_{2},SrCl_{2}$$ and $$BaCl_{2}$$ is
  • $$BaCl_{2} < SrCl_{2} < CaCl_{2} < MgCl_{2} < BeCl_{2}$$
  • $$BeCl_{2} < MgCl_{2} < CaCl_{2} < SrCl_{2} < BaCl_{2}$$
  • $$BeCl_{2} < CaCl_{2} < MgCl_{2} < SrCl_{2} < BaCl_{2}$$
  • $$MgCl_{2} < BeCl_{2} < SrCl_{2} < CaCl_{2} < BaCl_{2}$$
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