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) Their atoms are larger in size.

B) They contain fewer electrons in outer shells.

C) They form only ionic compounds.

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

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

A) Weak intermolecular forces

B) Strong metallic bonding involving both s and d electrons

C) Low nuclear charge

D) Absence of valence electrons

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

A) Non-metallic character

B) Low boiling point

C) Colorless compounds

D) Variable oxidation states

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Transition elements often form colored compounds because:

A) Their compounds are always ionic

B) They emit gamma radiation

C) They absorb all visible light

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

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

A) Fixed oxidation state

B) High density

C) Catalytic activity

D) Formation of colored compounds

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

A) Changes the products formed

B) Gets consumed during the reaction

C) Provides an alternative pathway with lower activation energy

D) Increases the equilibrium yield permanently

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

A) Platinum

B) Calcium

C) Aluminum

D) Sodium

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

A) Their inert nature

B) Their ability to form unstable intermediate compounds

C) Their large atomic size

D) Their low melting points

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Which statement best explains variable oxidation states in transition elements?

A) Both s and d electrons can participate in bonding

B) Only inner electrons are used

C) Only outer s-electrons are involved in bonding

D) They lose all electrons at once

10 / 25

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

A) Poor conductivity

B) Ability to change oxidation states easily

C) Low density

D) High reactivity only

11 / 25

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

A) Increases temperature

B) Acts as a reactant

C) Speeds up conversion of SO₂ to SO₃

D) Reduces pressure

12 / 25

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

A) Strong metallic bonding

B) Low melting point

C) Weak bonding

D) Variable density

13 / 25

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) s-orbitals are responsible

D) Partially filled d-orbitals allow electron transitions

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Why are transition elements good conductors of heat and electricity?

A) Presence of neutrons

B) Absence of bonding

C) Presence of free moving electrons

D) Low atomic mass

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

A) Electrolysis of water

B) Distillation of petroleum

C) Production of glass

D) Manufacture of margarine using nickel

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Which statement best explains why transition metals form complex ions?

A) They are non-metals

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

C) They have small charge

D) They lack valence electrons

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

A) Small number of protons

B) Low electron density

C) Weak covalent bonds

D) Strong metallic bonds with many delocalized electrons

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

A) Fixed oxidation state

B) Low density

C) High volatility

D) Ability to absorb reactants on surface

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

A) Contact process

B) Fractional distillation

C) Electrolysis

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 are non-metals

C) Transition elements have partially filled d-orbitals

D) Alkali metals lack electrons

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

A) Metallic bonding

B) High melting point

C) High density

D) Colored nature due to d-electron transitions

22 / 25

Which statement best explains catalytic activity in hydrogenation of oils?

A) Nickel reduces temperature

B) Nickel lowers activation energy by forming intermediate complexes

C) Nickel reacts permanently

D) Nickel increases pressure

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Which characteristic is common to ALL transition elements?

A) High melting point

B) Variable oxidation states

C) Colorless compounds

D) Low density

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

A) They are soft

B) They are non-reactive

C) They are gases

D) They have similar atomic sizes and strong bonding

25 / 25

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

A) Catalytic activity

B) Variable color

C) High melting point

D) High density

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