Advertisements
Advertisements
प्रश्न
Mercury, silver, gold are highly reactive metals.
विकल्प
Right
Wrong
उत्तर
Mercury, silver, gold are highly reactive metals- Wrong
APPEARS IN
संबंधित प्रश्न
Name two metals which are found in nature in the free state.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Name two metals which are found in nature mainly in the free state (as metallic elements).
What is the difference between a mineral and an ore?
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Give the principles of the hydrolytic method.
Give the principles of the froth floatation process.
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Name the following:
Name two metals always find in combined state.
What is galvanized iron.
Define calcination.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain concept with example/explain with the help of a balanced equation.
Roasting
Explain in brief types of extraction of highly reactive metals according to their reactivity.
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?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
