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

_______ is the least reactive metal. - Science and Technology 1

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प्रश्न

_______ is the least reactive metal.

पर्याय

  • silver

  • sodium

  • zinc

  • gold

MCQ
रिकाम्या जागा भरा

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

How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.


Write the composition of the alloy called bronze.


Name the method by which aluminium metal is extracted.


 Name two metals which occur in nature in free state as well as in combined state.


How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.


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


Explain givem equation, what happens when a mixture of Cu2O and Cu2S is heated?


Name the gas produced when calamine ore is calcined.

 


What is the difference between a mineral and an ore?


Give reasons, why aluminum is used in:

making alloys


Define the following term.

Mineral


How many valence electrons are present in metals ?


How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.


Atomic number of aluminium is _______ and its electronic configuration is _______.


Write the molecular formulae of the following compound.

Fluorspar


Explain the concept of Roasting.


Explain the following reaction with the balanced equation.

Zinc sulphide is heated strongly in excess of air


Explain in brief types of extraction of highly reactive metals according to their reactivity.


Observe the figure and answer the following.

  1. Write the name of the method.
  2. What is used as anode and cathode in this method?
  3. Write the molecular formula and use of cryolite.
  4. Write anode reaction.
  5. Write cathode reaction.

Which of the following ore is concentrated by the Froth floatation process?


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