Advertisements
Advertisements
Question
Iron is _______.
Options
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
Advertisements
Solution
Iron is less reactive than aluminium.
APPEARS IN
RELATED QUESTIONS
Name two metals which are found in nature in the free state.
Metallic oxides of zinc, magnesium and copper were heated with the following metals.
| Metal | Zinc | Magnesium | Copper |
| Zinc oxide | – | – | – |
| Magnesium oxide | – | – | – |
| Copper oxide | – | – | – |
In which cases will you find displacement reactions taking place?
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by:
Reduction with carbon.
Describe with one example, how moderately reactive metals (which are in the middle of reactivity series) are extracted.
What iron compound is present in haematite ore? Also write its chemical formula.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
The metal which is always present in an amalgam is ______.
Zinc blende ore can be converted into zinc oxide by the process of ______.
Aluminum is used in thermite welding:
write reaction for process?
Which method of refining is used to get 99.8% pure aluminium?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
How many valence electrons are present in non- metals?
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Explain the characteristics of ionic compounds.
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 poorest conductor of heat among metals is ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
