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प्रश्न
Iron is _______.
विकल्प
more reactive than zinc
more reactive than aluminium
less reactive than copper
less reactive than aluminium
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उत्तर
Iron is less reactive than aluminium.
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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?
Name the following:
The property possessed by metals by which they can be beaten into sheets.
Name the most abundant metal in the earth’s crust.
Name two metals which occur in nature in free state as well as in combined state.
What is meant by the ‘concentration of ore’?
Name three other metals which are extracted in a manner similar to sodium.
Rock salt is an ore of one of the following metals. This metal is:
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Name : The metal which is liquid at room temperature.
State three objectives achieved during the roasting of ores.
Usually ______ ores are subjected to ______ which is done in the absence of air.
What is the difference between calcination and roasting?
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
Extraction of aluminium from alumina-
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
- 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
