मराठी
महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (इंग्रजी माध्यम) इयत्ता १० वी

_______ is the least reactive metal.

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प्रश्न

_______ is the least reactive metal.

पर्याय

  • silver

  • sodium

  • zinc

  • gold

MCQ
रिकाम्या जागा भरा
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उत्तर

Gold is the least reactive metal.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 8: Metallugy - Choose the correct option.

संबंधित प्रश्‍न

Which of the following pairs will give displacement reactions?


Write the composition of the alloy called bronze.


Why do gold ornaments look new even after several years of use?


Name the method by which aluminium metal is extracted.


Explain given equation, what happens when ZnCO3 is heated in the absence of air?


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Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.


An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite


In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?


Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.


Give reasons, why aluminum is used in:

painting electric and telegraphic poles


Identify the process given in following passage and draw neat labelled diagram showing the process.
          Electrolysis of molten mixture of alumina (melting point > 20000C) is done in a steel tank. The tank has a graphite lining on the inner side. This lining does the work of a cathode. A set of graphite rods dipped in the molten electrolyte works as anode. Cryolite (Na3AlF6) and fluorspar (CaF2) are added in the mixture to lower its melting point upto 10000C.

 


Name the following:
The substance added to get rid of gangue in the extraction of metal.


What is meant by concentration of ores?


Aluminium oxide is _______ oxide.


Extraction of moderately reactive elements is done by _______ and _______ method.


The electrolysis of alumina involves the use of fluorspar and cryolite to increase the melting point.


Write the molecular formulae of the following compound.

Sodium aluminate


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