Zeigler Natta catalyst \(\mathrm{\left(\mathrm{R}_{3} \mathrm{Al}+\mathrm{TiCl}_{4}\right)}\) is used. [Usually \(\mathrm{\mathrm{R}=}\) ethyl]
CHXII08:THE D- & F-BLOCK ELEMENTS
321389
Identify the correct statement about \(\mathrm{\mathrm{CuCl}_{2}}\) and \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) in aqueous medium.
1 stability of \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is equal to stability of \(\mathrm{\mathrm{CuCl}_{2}}\)
2 both are unstable
3 \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is more stable than \(\mathrm{\mathrm{CuCl}_{2}}\)
4 \(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\).
Explanation:
\(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) due to smaller size and high hydration enthalphy. (Smaller the size of cation, more will be the hydration enthalphy.) \(\rm{\text { Hydration enthapy } \propto \dfrac{1}{\text { size of cation }}}\)
KCET - 2020
CHXII08:THE D- & F-BLOCK ELEMENTS
321390
Assertion : Rusting of iron is an example of corrosion. Reason : Rusting of iron is decreased by acids and electrolyte.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Corrosion is a process through which refined metals are converted into more stable compounds such as metal oxides, metal sulfides, or metal hydroxides. Rusting of iron is a common example. During rusting, iron oxidizes to \(\mathrm{Fe}^{2+}\) ions. These ions combine to form \(\mathrm{Fe}(\mathrm{OH})_{2}\), which further oxidizes to produce \(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}\) (rust). Acids aid in the dissolution of pure iron to ferrous ions, while electrolytes enhance conductivity, facilitating the electrochemical reactions involved in rust formation. Therefore option (3) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321391
Copper becomes green when exposed to moist air for a long period. This is due to
1 The formation of a layer of cupric oxide on the surface of copper.
2 The formation of basic copper sulphate layer on the surface of the metal.
3 The formation of a layer of cupric hydroxide on the surface of copper.
4 The formation of a layer of basic carbonate of copper on the surface of copper.
All copper (II) halides are known except cupric iodide \(\mathrm{\left(\mathrm{CuI}_{2}\right)}\) which rapidly decomposes to cuprous iodide, \(\mathrm{\mathrm{Cu}_{2} I_{2}}\) and \(\mathrm{I_{2}}\). \(\rm{2 \mathrm{CuI}_{2} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} .}\)
Zeigler Natta catalyst \(\mathrm{\left(\mathrm{R}_{3} \mathrm{Al}+\mathrm{TiCl}_{4}\right)}\) is used. [Usually \(\mathrm{\mathrm{R}=}\) ethyl]
CHXII08:THE D- & F-BLOCK ELEMENTS
321389
Identify the correct statement about \(\mathrm{\mathrm{CuCl}_{2}}\) and \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) in aqueous medium.
1 stability of \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is equal to stability of \(\mathrm{\mathrm{CuCl}_{2}}\)
2 both are unstable
3 \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is more stable than \(\mathrm{\mathrm{CuCl}_{2}}\)
4 \(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\).
Explanation:
\(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) due to smaller size and high hydration enthalphy. (Smaller the size of cation, more will be the hydration enthalphy.) \(\rm{\text { Hydration enthapy } \propto \dfrac{1}{\text { size of cation }}}\)
KCET - 2020
CHXII08:THE D- & F-BLOCK ELEMENTS
321390
Assertion : Rusting of iron is an example of corrosion. Reason : Rusting of iron is decreased by acids and electrolyte.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Corrosion is a process through which refined metals are converted into more stable compounds such as metal oxides, metal sulfides, or metal hydroxides. Rusting of iron is a common example. During rusting, iron oxidizes to \(\mathrm{Fe}^{2+}\) ions. These ions combine to form \(\mathrm{Fe}(\mathrm{OH})_{2}\), which further oxidizes to produce \(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}\) (rust). Acids aid in the dissolution of pure iron to ferrous ions, while electrolytes enhance conductivity, facilitating the electrochemical reactions involved in rust formation. Therefore option (3) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321391
Copper becomes green when exposed to moist air for a long period. This is due to
1 The formation of a layer of cupric oxide on the surface of copper.
2 The formation of basic copper sulphate layer on the surface of the metal.
3 The formation of a layer of cupric hydroxide on the surface of copper.
4 The formation of a layer of basic carbonate of copper on the surface of copper.
All copper (II) halides are known except cupric iodide \(\mathrm{\left(\mathrm{CuI}_{2}\right)}\) which rapidly decomposes to cuprous iodide, \(\mathrm{\mathrm{Cu}_{2} I_{2}}\) and \(\mathrm{I_{2}}\). \(\rm{2 \mathrm{CuI}_{2} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} .}\)
Zeigler Natta catalyst \(\mathrm{\left(\mathrm{R}_{3} \mathrm{Al}+\mathrm{TiCl}_{4}\right)}\) is used. [Usually \(\mathrm{\mathrm{R}=}\) ethyl]
CHXII08:THE D- & F-BLOCK ELEMENTS
321389
Identify the correct statement about \(\mathrm{\mathrm{CuCl}_{2}}\) and \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) in aqueous medium.
1 stability of \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is equal to stability of \(\mathrm{\mathrm{CuCl}_{2}}\)
2 both are unstable
3 \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is more stable than \(\mathrm{\mathrm{CuCl}_{2}}\)
4 \(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\).
Explanation:
\(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) due to smaller size and high hydration enthalphy. (Smaller the size of cation, more will be the hydration enthalphy.) \(\rm{\text { Hydration enthapy } \propto \dfrac{1}{\text { size of cation }}}\)
KCET - 2020
CHXII08:THE D- & F-BLOCK ELEMENTS
321390
Assertion : Rusting of iron is an example of corrosion. Reason : Rusting of iron is decreased by acids and electrolyte.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Corrosion is a process through which refined metals are converted into more stable compounds such as metal oxides, metal sulfides, or metal hydroxides. Rusting of iron is a common example. During rusting, iron oxidizes to \(\mathrm{Fe}^{2+}\) ions. These ions combine to form \(\mathrm{Fe}(\mathrm{OH})_{2}\), which further oxidizes to produce \(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}\) (rust). Acids aid in the dissolution of pure iron to ferrous ions, while electrolytes enhance conductivity, facilitating the electrochemical reactions involved in rust formation. Therefore option (3) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321391
Copper becomes green when exposed to moist air for a long period. This is due to
1 The formation of a layer of cupric oxide on the surface of copper.
2 The formation of basic copper sulphate layer on the surface of the metal.
3 The formation of a layer of cupric hydroxide on the surface of copper.
4 The formation of a layer of basic carbonate of copper on the surface of copper.
All copper (II) halides are known except cupric iodide \(\mathrm{\left(\mathrm{CuI}_{2}\right)}\) which rapidly decomposes to cuprous iodide, \(\mathrm{\mathrm{Cu}_{2} I_{2}}\) and \(\mathrm{I_{2}}\). \(\rm{2 \mathrm{CuI}_{2} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} .}\)
Zeigler Natta catalyst \(\mathrm{\left(\mathrm{R}_{3} \mathrm{Al}+\mathrm{TiCl}_{4}\right)}\) is used. [Usually \(\mathrm{\mathrm{R}=}\) ethyl]
CHXII08:THE D- & F-BLOCK ELEMENTS
321389
Identify the correct statement about \(\mathrm{\mathrm{CuCl}_{2}}\) and \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) in aqueous medium.
1 stability of \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is equal to stability of \(\mathrm{\mathrm{CuCl}_{2}}\)
2 both are unstable
3 \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is more stable than \(\mathrm{\mathrm{CuCl}_{2}}\)
4 \(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\).
Explanation:
\(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) due to smaller size and high hydration enthalphy. (Smaller the size of cation, more will be the hydration enthalphy.) \(\rm{\text { Hydration enthapy } \propto \dfrac{1}{\text { size of cation }}}\)
KCET - 2020
CHXII08:THE D- & F-BLOCK ELEMENTS
321390
Assertion : Rusting of iron is an example of corrosion. Reason : Rusting of iron is decreased by acids and electrolyte.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Corrosion is a process through which refined metals are converted into more stable compounds such as metal oxides, metal sulfides, or metal hydroxides. Rusting of iron is a common example. During rusting, iron oxidizes to \(\mathrm{Fe}^{2+}\) ions. These ions combine to form \(\mathrm{Fe}(\mathrm{OH})_{2}\), which further oxidizes to produce \(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}\) (rust). Acids aid in the dissolution of pure iron to ferrous ions, while electrolytes enhance conductivity, facilitating the electrochemical reactions involved in rust formation. Therefore option (3) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321391
Copper becomes green when exposed to moist air for a long period. This is due to
1 The formation of a layer of cupric oxide on the surface of copper.
2 The formation of basic copper sulphate layer on the surface of the metal.
3 The formation of a layer of cupric hydroxide on the surface of copper.
4 The formation of a layer of basic carbonate of copper on the surface of copper.
All copper (II) halides are known except cupric iodide \(\mathrm{\left(\mathrm{CuI}_{2}\right)}\) which rapidly decomposes to cuprous iodide, \(\mathrm{\mathrm{Cu}_{2} I_{2}}\) and \(\mathrm{I_{2}}\). \(\rm{2 \mathrm{CuI}_{2} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} .}\)
Zeigler Natta catalyst \(\mathrm{\left(\mathrm{R}_{3} \mathrm{Al}+\mathrm{TiCl}_{4}\right)}\) is used. [Usually \(\mathrm{\mathrm{R}=}\) ethyl]
CHXII08:THE D- & F-BLOCK ELEMENTS
321389
Identify the correct statement about \(\mathrm{\mathrm{CuCl}_{2}}\) and \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) in aqueous medium.
1 stability of \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is equal to stability of \(\mathrm{\mathrm{CuCl}_{2}}\)
2 both are unstable
3 \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) is more stable than \(\mathrm{\mathrm{CuCl}_{2}}\)
4 \(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\).
Explanation:
\(\mathrm{\mathrm{CuCl}_{2}}\) is more stable than \(\mathrm{\mathrm{Cu}_{2} \mathrm{Cl}_{2}}\) due to smaller size and high hydration enthalphy. (Smaller the size of cation, more will be the hydration enthalphy.) \(\rm{\text { Hydration enthapy } \propto \dfrac{1}{\text { size of cation }}}\)
KCET - 2020
CHXII08:THE D- & F-BLOCK ELEMENTS
321390
Assertion : Rusting of iron is an example of corrosion. Reason : Rusting of iron is decreased by acids and electrolyte.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Corrosion is a process through which refined metals are converted into more stable compounds such as metal oxides, metal sulfides, or metal hydroxides. Rusting of iron is a common example. During rusting, iron oxidizes to \(\mathrm{Fe}^{2+}\) ions. These ions combine to form \(\mathrm{Fe}(\mathrm{OH})_{2}\), which further oxidizes to produce \(\mathrm{Fe}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}\) (rust). Acids aid in the dissolution of pure iron to ferrous ions, while electrolytes enhance conductivity, facilitating the electrochemical reactions involved in rust formation. Therefore option (3) is correct.
CHXII08:THE D- & F-BLOCK ELEMENTS
321391
Copper becomes green when exposed to moist air for a long period. This is due to
1 The formation of a layer of cupric oxide on the surface of copper.
2 The formation of basic copper sulphate layer on the surface of the metal.
3 The formation of a layer of cupric hydroxide on the surface of copper.
4 The formation of a layer of basic carbonate of copper on the surface of copper.
All copper (II) halides are known except cupric iodide \(\mathrm{\left(\mathrm{CuI}_{2}\right)}\) which rapidly decomposes to cuprous iodide, \(\mathrm{\mathrm{Cu}_{2} I_{2}}\) and \(\mathrm{I_{2}}\). \(\rm{2 \mathrm{CuI}_{2} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} .}\)