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Read the following passage and answer the next five questions based on it.
The transition metals are very hard and have low volatility. Their melting and boiling points are high. In any row, the melting points of these metals rise to a maximum at d5 and fall regularly as atomic number increases. The high melting points of these metals are attributed to the involvement of greater number of electrons from (n– 1)d in addition to ns electrons in the interatomic metallic bonding.
The transition metals are very hard and have low volatility. Their melting and boiling points are high. In any row, the melting points of these metals rise to a maximum at d5 and fall regularly as atomic number increases. The high melting points of these metals are attributed to the involvement of greater number of electrons from (n– 1)d in addition to ns electrons in the interatomic metallic bonding.
Question: 1
Which transition metal is liquid at room temperature?
Which transition metal is liquid at room temperature?
Updated On: Nov 6, 2024
- Hg
- Cu
- Ag
- Au
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The Correct Option is A
Solution and Explanation
Mercury (Hg) is the only transition metal that exists as a liquid at room temperature.
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Question: 2
Which is the hardest metal?
Which is the hardest metal?
Updated On: Nov 6, 2024
- Zn
- Cu
- Hg
- Cd
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The Correct Option is B
Solution and Explanation
Copper is considered the hardest among the given metals due to its high ductility and strength compared to others in the list.
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Question: 3
In any row, melting points of these metals rise to a maximum at d5. Which transition metal is an exception?
In any row, melting points of these metals rise to a maximum at d5. Which transition metal is an exception?
Updated On: Nov 6, 2024
- Ti
- V
- Cr
- Mn
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The Correct Option is D
Solution and Explanation
In the periodic trend of melting points, manganese (Mn) is an exception as it does not follow the typical increase to a maximum at d5 due to its electronic configuration.
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Question: 4
Which transition metal has the highest melting point?
Which transition metal has the highest melting point?
Updated On: Nov 6, 2024
- Hf
- Ta
- W
- Re
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The Correct Option is C
Solution and Explanation
Tungsten (W) has the highest melting point of all elements, attributed to its strong metallic bonding and high atomic weight.
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Question: 5
How many electrons are needed in reduction of\(Cr_{2}O_{7}^{-2} to Cr^{3+}\)?
How many electrons are needed in reduction of\(Cr_{2}O_{7}^{-2} to Cr^{3+}\)?
Updated On: Nov 6, 2024
- One
- Six
- Five
- Eight
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The Correct Option is B
Solution and Explanation
The reduction of Cr2O72- to Cr3+ requires 6 electrons as each chromium atom undergoes a 3-electron reduction from +6 to +3 oxidation state.
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