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प्रश्न
Gold and silver are active metals.
पर्याय
Right
Wrong
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उत्तर
Gold and silver are active metals- Wrong
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संबंधित प्रश्न
A man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset, but after a futile argument, the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Write the composition of the alloy called bronze.
The rocky material found with ores is called ______.
Name the gas produced when calamine ore is calcined.
Name three other metals which are extracted in a manner similar to sodium.
Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Aluminum is used in thermite welding:
write reaction for process?
How many valence electrons are present in non- metals?
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
If Cu, Fe, Zn, Al elements are arranged in increasing order of their reactivity then the correct order would be which of the following?
Explain the concept of Calcination.
Explain the following reaction with the balanced equation.
Zinc carbonate is heated strongly in limited supply of air
Complete flow chart given below.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Explain in brief types of extraction of less reactive metals according to their reactivity.
