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प्रश्न
Aluminium oxide is _______ oxide.
पर्याय
acidic
basic
neutral
amphoteric
उत्तर
Aluminium oxide is amphoteric oxide.
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संबंधित प्रश्न
Why does a new aluminium vessel lose shine so soon after use?
Name two metals which are highly resistant to corrosion.
Name one metal which is extracted by reduction with heat alone.
Fill in the following blank with suitable word:
The rocky material found with ores is called.............
What iron compound is present in haematite ore? Also write its chemical formula.
Which metal is extracted from cinnabar ore?
Name three other metals which are extracted in a manner similar to sodium.
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Give the chemical formula of :
Sodium aluminate
Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
Name the electrode, from which aluminium collected.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Name a non- metal that has a metallic luster and sublimes on heating.
In electrolytic reduction of alumina _______ is used as a cathode.
The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.
Explain the following reaction with the balanced equation.
Ferric oxide is reacted with aluminium.
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain in brief types of extraction of less reactive metals according to their reactivity.
Observe the figure and answer the following.
- Write the name of the method.
- What is used as anode and cathode in this method?
- Write the molecular formula and use of cryolite.
- Write anode reaction.
- Write cathode reaction.
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?
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
