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प्रश्न
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
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उत्तर
Zinc oxide is reduced to zinc by heating it with carbon.
\[\ce{\underset{\text{Zinc oxide}}{ZnO_{(s)}} + \underset{\text{Carbon}}{C_{(s)}} ->[Heat] \underset{\text{Zinc}}{Zn_{(s)}} + \underset{\text{Carbon monoxide}}{CO↑}}\]
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संबंधित प्रश्न
M is a metal above hydrogen in the activity series and its oxide has the formula M2O. This oxide when dissolved in water forms the corresponding hydroxide which is a good conductor of electricity. In the above context, answer the following:
1) What kind of combination exists between M and O?
2)How many electrons are there in the outermost shell of M?
3) Name the group to which M belongs.
4) State the reaction taking place at the cathode.
5) Name the product at the anode.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Name one metal which is extracted by:
Electrolytic reduction.
Name one metal which is extracted by:
Reduction with aluminium.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Name two metals which are always found in combined state.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
The articles made of silver metal become dark on prolonged exposure to air. This is due to the formation of a layer of its ______.
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
Which one of the following is not true of metal :
Metals are malleable and ductile
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
In Electrolytic reduction of alumina, Anode : _______ : : Cathode : Graphite lining
Sulphide ores : Roasting : : Carbonate ores : _______
Write the name.
The process of extraction of aluminium from alumina-
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Answer the questions on the following passage.
The minerals from which the metal can be separated economically are called ores. Ores contain many types of impurities such as soil, sand and rocky substances along with metal compounds. These impurities are called gangue.
Metals can be extracted from their ores by means of various methods of separation. The process of extraction of metal in a pure state from the ores is also a part of metallurgy.
Ores are taken out from the mines and the gangue is usually separated from the ore at the site itself by various methods. Then the ores are carried out to the place where metals are produced. Here metals are extracted in pure form. Then metals are further purified by different methods of purification. This entire process is called metallurgy. Most metals being reactive do not occur in nature in the free state but are found in combined state as their salts such as oxides, carbonates, sulphides, and nitrates. however, the most unreactive metals that are not affected by air, water and other natural factors like silver, gold, platinum, generally occur in a free state. The compounds of metals that occur in nature along with the impurities are called minerals.
- What are ores?
- Which processes are involved in the branch of metallurgy? What is metallurgy?
- Which metals are found in a free state?
- In what forms are metals found in combined state?
- What is gangue?
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
Care must be taken while diluting concentrated nitric acid with water. Why?
