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Class 11 Chemistry Chapter 3 MCQ. We covered all the Class 11 Chemistry Chapter 3 MCQ in this post for free so that you can practice well for the exam.
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Class 11 Chemistry Chapter 3 Objective MCQ for Students
In which of the following elements is the orbital movement of electrons most suppressed?
a) Pm
b) Sm
c) Ti
d) None of these
Option c – Ti
The stability of a metal’s oxidation state in aqueous solutions depends on
a) Metal’s sublimation enthalpy
b) Ionization energy
c) Enthalpy of hydration of the ion
d) All of these
Option d – All of these
Which of these compounds appears colored due to charge transfer rather than d-d transitions?
a) K₂Cr₂O₇
b) KMnO₄
c) Both a and b
d) None of these
Option c – Both a and b
What is the correct molecular formula of permanganic acid?
a) HMnO₄
b) HMnO₅
c) H₂MnO₄
d) H₂MnO₃
Option a – HMnO₄
In the lanthanide group, how does the basic character of their hydroxides change?
a) Increases
b) Decreases
c) Increases first, then decreases
d) Decreases first, then increases
Option b – Decreases
Which substance is commonly used to synthesize potassium dichromate?
a) Chrome alum (K₂SO₄·Cr₂(SO₄)₃·24H₂O)
b) Chrome yellow (PbCrO₄)
c) Chromite (FeCr₂O₄)
d) Basic lead chromate (PbCrO₄·PbO)
Option c – Chromite (FeCr₂O₄)
Which of the following is the main raw material for producing KMnO₄?
a) Pyrolusite
b) Manganite
c) Magnetite
d) Haematite
Option a – Pyrolusite
Which of the following copper compounds has ionic characteristics?
a) CuF₂
b) CuCl₂
c) CuBr₂
d) None of these
Option a – CuF₂
Which of the following silver compounds are soluble in water?
a) AgF
b) AgF, AgNO₃
c) AgF, AgNO₃, AgClO₄
d) None of the above
Option c – AgF, AgNO₃, AgClO₄
Heating a mixture of K₂Cr₂O₇ and KCl with concentrated H₂SO₄ produces red vapors of
a) CrO₃
b) Cr₂O₃
c) CrO₂Cl₂
d) CrCl₃
Option c – CrO₂Cl₂
Which manganese oxide behaves as an acid?
a) MnO
b) Mn₂O₇
c) Mn₂O₃
d) MnO₂
Option b – Mn₂O₇
Which of the following transition metal ions has the lowest density?
a) Copper
b) Nickel
c) Scandium
d) Zinc
Option c – Scandium
Which of these oxides of manganese displays amphoteric behavior?
a) MnO₂
b) Mn₂O₃
c) Mn₂O₇
d) MnO
Option a – MnO₂
In d-block elements, the last electron enters which orbital?
a) (n–1)d
b) nd
c) np
d) (n–1)s
Option a – (n–1)d
Mercury adheres to glass when exposed to
a) Hg₂O
b) HNO₃
c) O₃
d) Grease
Option c – O₃
When excess KI is added to CuSO₄ followed by Na₂S₂O₃, which statement is incorrect?
a) Cu₂I₂ is produced
b) CuI₂ is produced
c) Na₂S₂O₃ gets oxidized
d) Liberated iodine gets reduced
Option b – CuI₂ is produced
What is formed when calomel (Hg₂Cl₂) reacts with ammonium hydroxide?
a) HgNH₂Cl
b) NH₂–Hg–Hg–Cl
c) Hg₂O
d) HgO
Option a – HgNH₂Cl
Among the given salts, which has the lowest magnetic behavior per mole at room temperature?
a) MnSO₄·4H₂O
b) CuSO₄·5H₂O
c) FeSO₄·6H₂O
d) NiSO₄·6H₂O
Option b – CuSO₄·5H₂O
A transition element with a lower oxidation state is likely to behave as
a) A base
b) An acid
c) An oxidizing agent
d) None of these
Option b – An acid
At what point does iron lose its ferromagnetic nature?
a) Curie temperature
b) Boiling temperature
c) Melting temperature
d) 1500 K
Option a – Curie temperature
Which of the following is not a true property of zinc?
a) It is a volatile element
b) It dissolves in alkali to form sodium zincate
c) It becomes brittle at extremely high temperatures
d) Zinc dust acts as a reducing agent
Option c – It becomes brittle at extremely high temperatures
What effect does forming interstitial compounds have on transition metals?
a) Makes them softer
b) Enhances ductility
c) Increases metallic behavior
d) Increases hardness
Option d – Increases hardness
Adding a non-metal to the interstitial sites of a metal causes it to become
a) Softer
b) Less tensile
c) Less malleable
d) More ductile
Option c – Less malleable
To prepare one normal liter of KMnO₄ for use in acidic medium, how much KMnO₄ is required?
a) 158 g
b) 31.60 g
c) 62.0 g
d) 790 g
Option b – 31.60 g
Which of the following copper halides is ionic in character?
a) CuF₂
b) CuCl₂
c) CuBr₂
d) None of these
Option a – CuF₂
Among the actinoid elements, which one is incorrectly listed?
a) U
b) Np
c) Tm
d) Fm
Option c – Tm
Which of the following oxides show amphoteric behavior? Mn₂O₇, CrO₃, Cr₂O₃, CrO, V₂O₅, V₂O₄
a) V₂O₅, Cr₂O₃
b) Mn₂O₇, CrO₃
c) CrO, V₂O₅
d) V₂O₅, V₂O₄
Option a – V₂O₅, Cr₂O₃
Which of these compounds is likely to be colored in the solid state due to unpaired electrons?
a) Ag₂SO₄
b) CuF₂
c) ZnF₂
d) Cu₂Cl₂
Option b – CuF₂
When a small amount of KMnO₄ is added to concentrated H₂SO₄, a green, oily, and explosive compound is formed. Identify it.
a) Mn₂O₇
b) MnO₂
c) MnSO₄
d) Mn₂O₃
Option a – Mn₂O₇
Which oxidation state is commonly exhibited by all lanthanide elements?
a) +2
b) +3
c) +4
d) +5
Option b – +3
Oxyhaemocyanin, a copper-based oxygen carrier, is diamagnetic because
a) both copper ions are in +1 state
b) copper ions are in +1 and +2 states
c) strong antiferromagnetic coupling exists between the Cu ions
d) copper ions interact ferromagnetically
Option a – both copper ions are in +1 state
Which of these metal oxides will not yield the metal upon heating?
a) HgO
b) ZnO
c) Ag₂O
d) All
Option b – ZnO
The most prevalent oxidation state among lanthanides is
a) +2
b) +3
c) +4
d) +1
Option b – +3
In neutral conditions, the equivalent mass of KMnO₄ is what fraction of its molecular mass?
a) One-third
b) One-sixth
c) One-half
d) None of these
Option a – One-third
KMnO₄ exhibits what degree of solubility in water?
a) Very high
b) Not soluble
c) Moderately
d) None of these
Option c – Moderately
Platinum group metals include
a) Ru and Os
b) Rh and Ir
c) Pd and Pt
d) All of these
Option d – All of these
Which among the following is a typical example of an ionic compound?
a) CuCl₂
b) CuF₂
c) CuBr₂
d) All of these
Option b – CuF₂
Fusion of MnO₂ with KOH produces a colored compound. What is it and its color?
a) K₂MnO₄, green
b) KMnO₄, purple
c) Mn₂O₃, brown
d) Mn₃O₄, black
Option a – K₂MnO₄, green
When i) NH₄VO₃ and ii) (NH₄)₂Cr₂O₇ are heated, what are the products?
a) N₂ is released in both cases
b) NH₃ is produced in both
c) NH₃ from (i) and N₂ from (ii)
d) N₂ from (i) and NH₃ from (ii)
Option c – NH₃ from (i) and N₂ from (ii)
Pyrolusite is chemically represented as
a) MnO
b) Mn₂O₃
c) MnO₂
d) None of these
Option c – MnO₂
What is the trend of ionic radius in the actinide series with increasing atomic number?
a) Slight contraction
b) Gradual increase
c) Remains constant
d) Varies irregularly
Option a – Slight contraction
Which vanadium oxide does not exist?
a) V₂O₃
b) VO₂
c) V₃O₂
d) VO
Option c – V₃O₂
Which among the following is an acidic oxide?
a) Mn₂O₃
b) Mn₃O₄
c) V₃O₂
d) None of these
Option d – None of these
Blood coagulation is facilitated by
a) Ferric alum
b) Potash alum
c) Both a and b
d) None
Option c – Both a and b
On adding H₂O₂ to acidified K₂Cr₂O₇, which product forms?
a) Cr₂O₃ causes green coloration
b) K₂CrO₄ turns the solution yellow
c) Deep blue-violet CrO(O₂)₂ appears
d) Green Cr(OH)₃ precipitates
Option c – Deep blue-violet CrO(O₂)₂ appears
Choose the element that does not display a +4 oxidation state.
a) Ti
b) Zr
c) La
d) Pt
Option c – La
What is formed when calomel reacts with NH₄OH?
a) HgNH₂Cl
b) NH₂–Hg–Hg–Cl
c) Hg₂O
d) HgO
Option a – HgNH₂Cl
What happens when a NaCl and K₂Cr₂O₇ mix is warmed gently with concentrated H₂SO₄?
a) Deep red vapors evolve
b) Yellow Na₂CrO₄ is formed in NaOH
c) Chromyl chloride forms
d) All of the above
Option d – All of the above
In the dichromate ion, how many Cr–O bonds are identical?
a) 4 bonds
b) 6 bonds
c) All bonds
d) None are the same
Option b – 6 bonds
Which of the following compounds show the same color in water?
a) VOCl₂ and FeCl₂
b) FeCl₂ and CuCl₂
c) MnCl₂ and FeCl₂
d) VOCl₂ and CuCl₂
Option d – VOCl₂ and CuCl₂
The reduction of Mn in aqueous KMnO₄ requires
a) 3 electrons in neutral medium
b) 5 electrons in acid
c) 3 electrons in base
d) All of these
Option d – All of these
What color of light is absorbed by aqueous CuSO₄?
a) Orange-red
b) Blue-green
c) Yellow
d) Violet
Option a – Orange-red
Which hydrogen halides react with AgNO₃ to give a precipitate that dissolves in Na₂S₂O₃?
a) HCl
b) HI
c) HBr
d) All of these
Option d – All of these
The elements from thorium to lawrencium, where 5f orbitals are being filled, are known as
a) Lanthanides
b) Rare earths
c) Actinides
d) Transuranic
Option c – Actinides
Heating CuSO₄·5H₂O to 370 K gives
a) CuSO₄·H₂O
b) CuSO₄
c) CuSO₄·3H₂O
d) Cu₂O
Option a – CuSO₄·H₂O
Silver shows a spattering effect due to absorption of
a) CO₂
b) H₂S
c) H₂
d) O₂
Option d – O₂
What is commonly referred to as “Purple of Cassius”?
a) AuCl₂
b) AuCl₄
c) Colloidal gold
d) None of these
Option c – Colloidal gold
What is the chemical identity of calamine? ( Class 11 Chemistry MCQ )
a) ZnS
b) ZnCO₃
c) ZnO·Fe₂O₃
d) ZnO
Option b – ZnCO₃
When excess KI reacts with CuSO₄ followed by the addition of Na₂S₂O₃, which statement is incorrect?
a) Liberated iodine is reduced
b) CuI₂ is produced
c) Na₂S₂O₃ undergoes oxidation
d) Cu₂I₂ is formed
Option b – CuI₂ is produced
On heating ammonium dichromate, which substances are produced? ( Class 11 Chemistry MCQ )
a) Cr₂O₃
b) N₂
c) None
d) Both a and b
Option d – Both a and b
Stellite, a chromium-based alloy, contains which elements?
a) Co
b) W
c) Both a and b
d) All of these
Option c – Both a and b
Transition metals often act as catalysts due to ( Class 11 Chemistry MCQ )
a) High ionic charges
b) Large surface area for adsorption
c) Presence of unpaired d-electrons
d) Both b and c
Option d – Both b and c
Which transition element is least resistant to corrosion? ( Class 11 Chemistry MCQ )
a) Fe
b) Ni
c) Co
d) All of these
Option a – Fe
Which element is a component of human red blood cells?
a) Fe
b) Ra
c) Co
d) All of these
Option a – Fe
Passivation of iron occurs when treated with ( Class 11 Chemistry MCQ )
a) Concentrated HCl
b) Concentrated HNO₃
c) Concentrated HNO₂
d) All of these
Option b – Concentrated HNO₃
What happens to iron during rust formation in moist air? ( Class 11 Chemistry MCQ )
a) It loses electrons
b) It gains electrons
c) No electron transfer occurs
d) It undergoes hydrogenation
Option a – It loses electrons
Mond’s process is used in the extraction of which metal?
a) Fe
b) Ni
c) Co
d) HNO₃
Option b – Ni
Which metal is only soluble in aqua regia?
a) Co
b) Fe
c) Ni
d) Au
Option d – Au
Which metal among the following corrodes most easily in moist air? ( Class 11 Chemistry MCQ )
a) Au
b) Ag
c) Fe
d) Ni
Option c – Fe
Which transition metal is part of the vitamin B₁₂ structure?
a) Mg
b) Co
c) Zn
d) Fe
Option b – Co
What is the product when chlorine reacts with sodium thiosulphate? ( Class 11 Chemistry MCQ )
a) Na₂SO₃
b) Na₂O
c) Na₂SO₄
d) Na₂CO₃
Option c – Na₂SO₄
Which of these statements about helium is incorrect? ( Class 11 Chemistry MCQ )
a) Used in balloons due to being lighter and nonflammable
b) Acts as a cryogenic medium in low-temperature experiments
c) Helps generate strong superconducting magnets
d) Used in gas-cooled nuclear reactors
Option a – Used in balloons due to being lighter and nonflammable
Identify the incorrect chemical formula for element X.
a) X₂Cl₃
b) X₂O₃
c) X₂(SO₄)₃
d) XPO₄
Option a – X₂Cl₃
Which of the following xenon compounds has a planar geometry? ( Class 11 Chemistry MCQ )
a) XeF₄
b) XeOF₂
c) XeO₂F₂
d) XeO₄
Option a – XeF₄
Which xenon reaction is not possible? ( Class 11 Chemistry MCQ )
a) XeO₃ + 6HF → XeF₆ + 3H₂O
b) 3XeF₄ + 6H₂O → 2Xe + XeO₃ + 12HF + 1.5O₂
c) 2XeF₂ + 2H₂O₂ → Xe + 4HF + O₂
d) XeF₆ + RbF → Rb(XeF₇)
Option a – XeO₃ + 6HF → XeF₆ + 3H₂O
What is the correct order of solubility of noble gases in water?
a) He > Ne > Ar > Kr > Xe
b) Xe > Kr > Ar > Ne > He
c) Ne > Ar > Kr > He > Xe
d) Ar > Ne > He > Kr > Xe
Option b – Xe > Kr > Ar > Ne > He
How many lone pairs are on xenon in XeF₂, XeF₄, and XeF₆ respectively?
a) 2, 3, 1
b) 1, 2, 3
c) 4, 1, 2
d) 3, 2, 1
Option d – 3, 2, 1
Euchlorine is generated by heating which mixture?
a) KCl + conc. H₂SO₄
b) KCl + conc. HCl
c) K₂ClO₃ + conc. H₂SO₄
d) KClO₃ + conc. HCl
Option d – KClO₃ + conc. HCl
Which of the following is the strongest acid? ( Class 11 Chemistry MCQ )
a) HClO₄
b) H₂SO₃
c) H₂SO₄
d) HClO₃
Option a – HClO₄
Which element forms the fewest oxyacids? ( Class 11 Chemistry MCQ )
a) Nitrogen
b) Sulfur
c) Fluorine
d) Chlorine
Option c – Fluorine
What is the main contributor to ozone depletion in the upper atmosphere?
a) Polyhalogens
b) Ferrocene
c) Fullerenes
d) Freons
Option d – Freons
In which of these molecules are the bond lengths not all equal? ( Class 11 Chemistry MCQ )
a) NF₃
b) ClF₃
c) BF₃
d) AlF₃
Option b – ClF₃
Tincture of iodine is
a) Iodine in water
b) Iodine in aqueous KI
c) Alcoholic solution of iodine
d) Aqueous solution
Option b – Iodine in aqueous KI
Fluorine gas is produced when K₂MnF₆ reacts with
a) SbF₅
b) MnF₃
c) KSbF₆
d) MnF₄
Option a – SbF₅
Which of the following represents correct electron affinity comparison among halogens? ( Class 11 Chemistry MCQ )
a) Br > F
b) F > Cl
c) Br > Cl
d) F > I
Option d – F > I
Which of these hydrogen halides has the greatest basic character?
a) HF
b) HCl
c) HBr
d) HI
Option a – HF
Which of the following is correct regarding chlorine dioxide (ClO₂)? ( Class 11 Chemistry MCQ )
a) It is paramagnetic
b) It forms dimers in liquid state
c) It is a linear molecule
d) It is chemically inert
Option a – It is paramagnetic
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