Advertisements
Advertisements
Question
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Options
Cu, Fe, Zn, Al
Al, Cu, Fe, Zn
Zn, Al, Cu, Fe
Fe, Zn, Al, Cu
Advertisements
Solution
Cu, Fe, Zn, Al
APPEARS IN
RELATED QUESTIONS
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Define the term mineral.
How is sodium metal extracted? Explain with the help of equation of the reaction involved.
Which metal is extracted from bauxite ore?
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Give reasons, why aluminum is used in:
making alloys
Give the chemical formula of :
Cryolite
What is galvanized iron.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Choose the correct answer from the options given below:
The metal is a liquid at room temperature.
Zinc blende is converted to oxide by ______ process.
Iron is _______.
Write the name.
Metals which are amphoteric in nature.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
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.
In thermite welding a mixture of ____________ is ignited with a burning magnesium ribbon which produces molten iron metal as a large amount of heat is evolved.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
