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Rusting of an article made up of iron is called - Science

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प्रश्न

Rusting of an article made up of iron is called

पर्याय

  • corrosion and it is a physical as well as chemical change

  • dissolution and it is a physical change

  • corrosion and it is a chemical change

  • dissolution and it is a chemical change

MCQ
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उत्तर

corrosion and it is a chemical change

Explanation: 

Rusting of an article made up of iron is called corrosion. Corrosion is a chemical change because rust is a chemical compound (hydrated iron oxide, Fe2O3 - H2O) which is totally different from element iron (Fe). 

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पाठ 2: Is Matter Around Us Pure - Multiple Choice Questions [पृष्ठ १२]

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एनसीईआरटी एक्झांप्लर Science [English] Class 9
पाठ 2 Is Matter Around Us Pure
Multiple Choice Questions | Q 2. | पृष्ठ १२

व्हिडिओ ट्यूटोरियलVIEW ALL [3]

संबंधित प्रश्‍न

Select the correct alternative

The molecules can move freely anywhere in

  1. gases
  2. liquids
  3. solids
  4. none of the above

Fill in the blank :

The state of matter with definite volume and definite shape is called______


Name a non-metal which is a good conductor of electricity.


Which type of elements, metals or non-metals, show the property of brittleness ?


Explain why, hydrogen and oxygen are considered elements whereas water is not considered an element.


How would you confirm that a colourless liquid given to your is pure water ?


Name a metal which forms amalgams.


Which of the following statements are true for pure substances ?

  1. pure substances contain only one kind of particles
  2. pure substances may be compounds or mixtures
  3. pure substances have the same composition throughout
  4. pure substances can be exemplified by all elements other than nickel

Name the property of one of the constituents which can be used to separate a mixture of salt and iodine


How will you separate a mixture of iron filings and powdered carbon ?


How will you separate camphor, common salt and iron nails from their mixture ?


With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.


Name the metals that are used in jewellery.


Why wires cannot be drawn from materials such as stone or wood?


The non S I and S I units of some physical  quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity: 

(A) (B)
(a) degree celsius (i) kilogram
(b) centimetre (ii) pascal
(c) gram per centimetre cube (iii) metre
(d)  bar (iv) kelvin
(e) milligram (v)  kilogram per metre cube

In Aerosol the dispersed phase is liquid and the dispersion medium is gas.


Evaporation is always accompanied by ______ in temperature. 


Give an example of a molecule.


Give an example of liquid in gas.


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