Class 10 Exam > Class 10 Questions > Statement A:The electrical conductivity and m...
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Statement A: The electrical conductivity and melting point of an alloy is less than that of pure metals.
Statement B: Different metals have same reactivity with water and dilute acids.
- a)Statement A is true; Statement B is false.
- b)Statement B is true; Statement A is false.
- c)Both the statements - A and B - are true.
- d)Neither statement A nor statement B is true.
Correct answer is option 'A'. Can you explain this answer?
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Statement A:The electrical conductivity and meltingpoint of an alloy i...
Alloys have lower electrical conductivity than that of pure metals. Alloys have lower melting points than that of the constituent metals. Different metals have different reactivity with water and dilute acids. Sodium and potassium react vigorously with cold water. Some metals like magnesium and calcium react with water to form metal hydroxide and hydrogen while some like aluminium and iron react with steam to form metal oxide and hydrogen. Metals usually displace hydrogen from dilute acids; some react only on heating. Metals like gold, silver and copper do not react with dilute acids at all.
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Statement A:The electrical conductivity and meltingpoint of an alloy i...
Statement A: The electrical conductivity and melting point of an alloy is less than that of pure metals.
Statement B: Different metals have the same reactivity with water and dilute acids.
The correct answer is option 'A': Statement A is true; Statement B is false.
Explanation:
Statement A: The electrical conductivity and melting point of an alloy is less than that of pure metals.
1. Electrical Conductivity:
- Pure metals have high electrical conductivity because the delocalized electrons in their structure can move freely and carry electric charge.
- Alloys, on the other hand, are made up of a mixture of different metals or a metal and a non-metal. The presence of impurities or different types of atoms in the alloy disrupts the regular arrangement of atoms, making it more difficult for electrons to move freely.
- Therefore, the electrical conductivity of alloys is generally lower than that of pure metals.
2. Melting Point:
- Pure metals have a regular arrangement of atoms in their structure, which allows for efficient packing of atoms. This results in strong metallic bonds, leading to high melting points.
- Alloys, on the other hand, have a more complex structure due to the presence of different types of atoms or impurities. This disrupts the regular packing of atoms and weakens the metallic bonds.
- Consequently, alloys generally have lower melting points compared to pure metals.
Statement B: Different metals have the same reactivity with water and dilute acids.
1. Reactivity with Water:
- Different metals react differently with water. Some metals, such as sodium and potassium, are highly reactive and react vigorously with water, releasing hydrogen gas and forming metal hydroxides.
- Other metals, such as copper and silver, are less reactive and do not react with water under normal conditions.
- Therefore, different metals show different reactivity with water.
2. Reactivity with Dilute Acids:
- Different metals also show varying reactivity with dilute acids. Some metals, such as magnesium and zinc, react with dilute acids to produce hydrogen gas and metal salts.
- Other metals, such as gold and platinum, are unreactive and do not react with dilute acids.
- Hence, different metals exhibit different reactivity with dilute acids.
In conclusion, Statement A is true because the electrical conductivity and melting point of alloys are generally lower than that of pure metals. Statement B is false because different metals have varying reactivity with water and dilute acids.
Statement B: Different metals have the same reactivity with water and dilute acids.
The correct answer is option 'A': Statement A is true; Statement B is false.
Explanation:
Statement A: The electrical conductivity and melting point of an alloy is less than that of pure metals.
1. Electrical Conductivity:
- Pure metals have high electrical conductivity because the delocalized electrons in their structure can move freely and carry electric charge.
- Alloys, on the other hand, are made up of a mixture of different metals or a metal and a non-metal. The presence of impurities or different types of atoms in the alloy disrupts the regular arrangement of atoms, making it more difficult for electrons to move freely.
- Therefore, the electrical conductivity of alloys is generally lower than that of pure metals.
2. Melting Point:
- Pure metals have a regular arrangement of atoms in their structure, which allows for efficient packing of atoms. This results in strong metallic bonds, leading to high melting points.
- Alloys, on the other hand, have a more complex structure due to the presence of different types of atoms or impurities. This disrupts the regular packing of atoms and weakens the metallic bonds.
- Consequently, alloys generally have lower melting points compared to pure metals.
Statement B: Different metals have the same reactivity with water and dilute acids.
1. Reactivity with Water:
- Different metals react differently with water. Some metals, such as sodium and potassium, are highly reactive and react vigorously with water, releasing hydrogen gas and forming metal hydroxides.
- Other metals, such as copper and silver, are less reactive and do not react with water under normal conditions.
- Therefore, different metals show different reactivity with water.
2. Reactivity with Dilute Acids:
- Different metals also show varying reactivity with dilute acids. Some metals, such as magnesium and zinc, react with dilute acids to produce hydrogen gas and metal salts.
- Other metals, such as gold and platinum, are unreactive and do not react with dilute acids.
- Hence, different metals exhibit different reactivity with dilute acids.
In conclusion, Statement A is true because the electrical conductivity and melting point of alloys are generally lower than that of pure metals. Statement B is false because different metals have varying reactivity with water and dilute acids.
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Statement A:The electrical conductivity and meltingpoint of an alloy is less than that of pure metals.Statement B:Different metals have same reactivity with water and dilute acids.a)Statement A is true;Statement B is false.b)Statement B is true;Statement A is false.c)Both the statements - A and B - are true.d)Neither statement A nor statement B is true.Correct answer is option 'A'. Can you explain this answer?
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