An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal. For example: • Stainless steel is an alloy of Nickel and Chromium. • Amalgam is an alloy of Mercury. • Brass is an alloy of Copper and Zinc. • Bronze is an alloy of Copper and Tin. • Solder is an alloy of Lead and TRead more
An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
For example:
• Stainless steel is an alloy of Nickel and Chromium.
• Amalgam is an alloy of Mercury.
• Brass is an alloy of Copper and Zinc.
• Bronze is an alloy of Copper and Tin.
• Solder is an alloy of Lead and Tin.
The metals which are the least reactive, do not corrode easily. For example: Gold, silver, platinum and copper. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
The metals which are the least reactive, do not corrode easily.
For example:
Gold, silver, platinum and copper.
•Metals low in the activity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone. 2HgO(s) → 2Hg(l) + O(g) •The metals in the middle of the activity series such as iron, zinc, lead, copper, etc., are moderately reactive. These metal oxides are reduced to thRead more
•Metals low in the activity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone.
2HgO(s) → 2Hg(l) + O(g)
•The metals in the middle of the activity series such as iron, zinc, lead, copper, etc., are moderately reactive. These metal oxides are reduced to the corresponding metals by using suitable reducing agents
ZnO(s) + C(s) → Zn(s) + CO(g)
•The metals high up in the reactivity series are very reactive. They are separated from their oxides by electrolysis process.
The metals which are the least reactive, they are often found in a free state. For example: Gold, silver, platinum and copper are found in the free state. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
The metals which are the least reactive, they are often found in a free state.
For example:
Gold, silver, platinum and copper are found in the free state.
(i) Mineral The elements or compounds, which occur naturally in the earth’s crust, are known as minerals. (ii) Ore If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores. (iii) Gangue Ores mined from the eartRead more
(i) Mineral The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.
(ii) Ore
If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.
(iii) Gangue
Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
Ionic compounds have high melting and boiling points. Because ionic compounds are formed by the attraction force of two opposite ions and a considerable amount of energy is required to break this strong inter-ionic attraction. For more answers visit to website: https://www.tiwariacademy.com/ncert-soRead more
Ionic compounds have high melting and boiling points. Because ionic compounds are formed by the attraction force of two opposite ions and a considerable amount of energy is required to break this strong inter-ionic attraction.
Zinc is more reactive than Iron. When Zn is added to Iron (II) Sulphate, Zinc displaces Iron from its solutions and Zinc sulphate is formed. Zn(s) + FeSO₄(aq) → ZnSO₄(aq) + Cu(s) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Zinc is more reactive than Iron. When Zn is added to Iron (II) Sulphate, Zinc displaces Iron from its solutions and Zinc sulphate is formed.
Zn(s) + FeSO₄(aq) → ZnSO₄(aq) + Cu(s)
When reactive metals react with dilute hydrochloric acids, gives a salt and hydrogen gas Metal + Dilute acid → Salt + Hydrogen Reaction between Iron and H₂SO₄ For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
When reactive metals react with dilute hydrochloric acids, gives a salt and hydrogen gas
Metal + Dilute acid → Salt + Hydrogen
Reaction between Iron and H₂SO₄
(i) Iron react with steam to form the metal oxide and hydrogen. 3Fe(s) + 4H₂O(g) → Fe3O4(s) + 4H₂(g) (ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire. Ca(s) + 2H₂O(l) → Ca(OH) ₂ (aq) + H₂ (g) Calcium starts floating because tRead more
(i) Iron react with steam to form the metal oxide and hydrogen.
3Fe(s) + 4H₂O(g) → Fe3O4(s) + 4H₂(g)
(ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire.
Ca(s) + 2H₂O(l) → Ca(OH) ₂ (aq) + H₂ (g)
Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.
Potassium react violently with cold water and its reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.
2K(s) + 2H₂O(l) → 2KOH(aq) + H₂(g) + heat energy
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-Read more
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
What are alloys?
An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal. For example: • Stainless steel is an alloy of Nickel and Chromium. • Amalgam is an alloy of Mercury. • Brass is an alloy of Copper and Zinc. • Bronze is an alloy of Copper and Tin. • Solder is an alloy of Lead and TRead more
An alloy is a homogeneous mixture of two or more metals, or a metal and a non-metal.
For example:
• Stainless steel is an alloy of Nickel and Chromium.
• Amalgam is an alloy of Mercury.
• Brass is an alloy of Copper and Zinc.
• Bronze is an alloy of Copper and Tin.
• Solder is an alloy of Lead and Tin.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Which metals do not corrode easily?
The metals which are the least reactive, do not corrode easily. For example: Gold, silver, platinum and copper. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
The metals which are the least reactive, do not corrode easily.
For example:
Gold, silver, platinum and copper.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
What chemical process is used for obtaining a metal from its oxide?
•Metals low in the activity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone. 2HgO(s) → 2Hg(l) + O(g) •The metals in the middle of the activity series such as iron, zinc, lead, copper, etc., are moderately reactive. These metal oxides are reduced to thRead more
•Metals low in the activity series are very unreactive. The oxides of these metals can be reduced to metals by heating alone.
2HgO(s) → 2Hg(l) + O(g)
•The metals in the middle of the activity series such as iron, zinc, lead, copper, etc., are moderately reactive. These metal oxides are reduced to the corresponding metals by using suitable reducing agents
ZnO(s) + C(s) → Zn(s) + CO(g)
•The metals high up in the reactivity series are very reactive. They are separated from their oxides by electrolysis process.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Name two metals which are found in nature in the free state.
The metals which are the least reactive, they are often found in a free state. For example: Gold, silver, platinum and copper are found in the free state. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
The metals which are the least reactive, they are often found in a free state.
For example:
Gold, silver, platinum and copper are found in the free state.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Define the following terms.
(i) Mineral The elements or compounds, which occur naturally in the earth’s crust, are known as minerals. (ii) Ore If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores. (iii) Gangue Ores mined from the eartRead more
(i) Mineral The elements or compounds, which occur naturally in the earth’s crust, are known as minerals.
(ii) Ore
If minerals contain a very high percentage of a particular metal and the metal can be profitably extracted from it. These minerals are called ores.
(iii) Gangue
Ores mined from the earth are usually contaminated with large amounts of impurities such as soil, sand, etc., called gangue.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Why do ionic compounds have high melting points?
Ionic compounds have high melting and boiling points. Because ionic compounds are formed by the attraction force of two opposite ions and a considerable amount of energy is required to break this strong inter-ionic attraction. For more answers visit to website: https://www.tiwariacademy.com/ncert-soRead more
Ionic compounds have high melting and boiling points. Because ionic compounds are formed by the attraction force of two opposite ions and a considerable amount of energy is required to break this strong inter-ionic attraction.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
What would you observe when zinc is added to a solution of iron(II) sulphate? Write the chemical reaction that takes place.
Zinc is more reactive than Iron. When Zn is added to Iron (II) Sulphate, Zinc displaces Iron from its solutions and Zinc sulphate is formed. Zn(s) + FeSO₄(aq) → ZnSO₄(aq) + Cu(s) For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Zinc is more reactive than Iron. When Zn is added to Iron (II) Sulphate, Zinc displaces Iron from its solutions and Zinc sulphate is formed.
Zn(s) + FeSO₄(aq) → ZnSO₄(aq) + Cu(s)
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Which gas is produced when dilute hydrochloric acid is added to a reactive metal? Write the chemical reaction when iron reacts with dilute H2SO4.
When reactive metals react with dilute hydrochloric acids, gives a salt and hydrogen gas Metal + Dilute acid → Salt + Hydrogen Reaction between Iron and H₂SO₄ For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
When reactive metals react with dilute hydrochloric acids, gives a salt and hydrogen gas
Metal + Dilute acid → Salt + Hydrogen
Reaction between Iron and H₂SO₄
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Write equations for the reactions of (i) iron with steam (ii) calcium and potassium with water.
(i) Iron react with steam to form the metal oxide and hydrogen. 3Fe(s) + 4H₂O(g) → Fe3O4(s) + 4H₂(g) (ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire. Ca(s) + 2H₂O(l) → Ca(OH) ₂ (aq) + H₂ (g) Calcium starts floating because tRead more
(i) Iron react with steam to form the metal oxide and hydrogen.
3Fe(s) + 4H₂O(g) → Fe3O4(s) + 4H₂(g)
(ii) The reaction of calcium with water is exothermic but the heat evolved is not sufficient for the hydrogen to catch fire.
Ca(s) + 2H₂O(l) → Ca(OH) ₂ (aq) + H₂ (g)
Calcium starts floating because the bubbles of hydrogen gas formed stick to the surface of the metal.
Potassium react violently with cold water and its reaction is so violent and exothermic that the evolved hydrogen immediately catches fire.
2K(s) + 2H₂O(l) → 2KOH(aq) + H₂(g) + heat energy
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/
Why is sodium kept immersed in kerosene oil?
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-Read more
Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-3/