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प्रश्न
Find the odd one out and give its explanation.
विकल्प
Na
K
Cu
Li
उत्तर
Cu
Explanation-
Copper (Cu) is a less reactive metal while others are highly reactive metals.
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संबंधित प्रश्न
Name the following: Main ore of aluminium.
Name a reducing agent that may be used to obtain manganese from manganese dioxide.
Why are the metals like Na, K, Ca and Mg never found in their free state in nature?
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name two metals which are always found in combined state.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Give the name of one ore of iron. Which iron compound is present in this ore? Write its chemical formula.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of:
(a) carbon
(b) hydrogen
(c) electrolysis
(d) aluminium
Define the term : Gangue
What is meant by refining of metals? Name the three common methods used for refining.
Which method of refining is used to get 99.8% pure aluminium?
Compare the properties of a typical metal and a non- metal on the basis of the following:
(a) electronic configuration
(b) nature of oxides
(c) oxidizing or reducing action
(d) conductivity of heat and electricity
Name the following:
The process of heating an ore to a high temperature in the presence of air.
_______ is the least reactive metal.
Mercury, silver, gold are highly reactive metals.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Complete flow chart given below.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give the reason why the above reaction is known as a thermite reaction.
