Chemistry 9th Chap 4 : Topic 17 - Maryam Publications

Chemistry Chapter 4 : Topic 17

Transition Element Properties

1 / 25

Which statement best explains why transition elements generally have high densities compared to s-block elements?

A) They have closely packed atoms due to strong metallic bonding involving d-electrons.

B) They contain fewer electrons in outer shells.

C) They form only ionic compounds.

D) Their atoms are larger in size.

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The high melting points of transition elements are mainly due to:

A) Strong metallic bonding involving both s and d electrons

B) Low nuclear charge

C) Absence of valence electrons

D) Weak intermolecular forces

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Which property of transition elements is directly related to the presence of partially filled d-orbitals?

A) Colorless compounds

B) Variable oxidation states

C) Non-metallic character

D) Low boiling point

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Transition elements often form colored compounds because:

A) Their compounds are always ionic

B) Electrons in d-orbitals undergo energy transitions by absorbing specific wavelengths

C) They emit gamma radiation

D) They absorb all visible light

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Which of the following is NOT a typical property of transition elements?

A) Fixed oxidation state

B) High density

C) Formation of colored compounds

D) Catalytic activity

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In the Haber process, iron acts as a catalyst because it:

A) Gets consumed during the reaction

B) Changes the products formed

C) Increases the equilibrium yield permanently

D) Provides an alternative pathway with lower activation energy

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Which transition element is commonly used in catalytic converters to reduce harmful gases in automobile exhaust?

A) Sodium

B) Platinum

C) Aluminum

D) Calcium

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The ability of transition elements to act as catalysts is mainly due to:

A) Their ability to form unstable intermediate compounds

B) Their large atomic size

C) Their low melting points

D) Their inert nature

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Which statement best explains variable oxidation states in transition elements?

A) They lose all electrons at once

B) Only inner electrons are used

C) Only outer s-electrons are involved in bonding

D) Both s and d electrons can participate in bonding

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Which property of transition elements makes them suitable for industrial catalysts like in the Contact process?

A) High reactivity only

B) Low density

C) Poor conductivity

D) Ability to change oxidation states easily

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In the Contact process, vanadium (V) oxide is used because it:

A) Reduces pressure

B) Increases temperature

C) Speeds up conversion of SO₂ to SO₃

D) Acts as a reactant

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Which transition metal property is responsible for the hardness and strength of alloys?

A) Weak bonding

B) Low melting point

C) Variable density

D) Strong metallic bonding

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Which of the following correctly relates color formation to electronic structure?

A) Full d-orbitals produce intense color

B) Empty d-orbitals produce color

C) Partially filled d-orbitals allow electron transitions

D) s-orbitals are responsible

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Why are transition elements good conductors of heat and electricity?

A) Presence of neutrons

B) Presence of free moving electrons

C) Absence of bonding

D) Low atomic mass

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Which of the following is an example of catalytic use of transition elements in industry?

A) Manufacture of margarine using nickel

B) Production of glass

C) Distillation of petroleum

D) Electrolysis of water

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Which statement best explains why transition metals form complex ions?

A) They lack valence electrons

B) They have small charge

C) They have vacant d-orbitals to accept electron pairs

D) They are non-metals

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Which factor contributes most to the high melting points of transition elements?

A) Weak covalent bonds

B) Strong metallic bonds with many delocalized electrons

C) Low electron density

D) Small number of protons

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Which transition element property is responsible for the effectiveness of catalytic converters?

A) Fixed oxidation state

B) High volatility

C) Ability to absorb reactants on surface

D) Low density

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Which of the following processes uses a transition metal catalyst involving iron?

A) Electrolysis

B) Fractional distillation

C) Contact process

D) Haber process

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Why do transition elements show multiple oxidation states while alkali metals do not?

A) Alkali metals are heavier

B) Transition elements have partially filled d-orbitals

C) Alkali metals lack electrons

D) Transition elements are non-metals

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Which property explains why many transition metal compounds are used as pigments?

A) High melting point

B) Colored nature due to d-electron transitions

C) High density

D) Metallic bonding

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Which statement best explains catalytic activity in hydrogenation of oils?

A) Nickel increases pressure

B) Nickel reduces temperature

C) Nickel reacts permanently

D) Nickel lowers activation energy by forming intermediate complexes

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Which characteristic is common to ALL transition elements?

A) Variable oxidation states

B) Low density

C) High melting point

D) Colorless compounds

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Which of the following explains why transition elements are often used in making alloys?

A) They have similar atomic sizes and strong bonding

B) They are soft

C) They are non-reactive

D) They are gases

25 / 25

Which property of transition elements allows them to speed up reactions without being consumed?

A) Variable color

B) Catalytic activity

C) High density

D) High melting point

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