मराठी
महाराष्ट्र राज्य शिक्षण मंडळएचएससी विज्ञान (सामान्य) इयत्ता १२ वी

Pyrolusite Ore is _______.

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प्रश्न

Pyrolusite ore is _______.

पर्याय

  • MnO

  • MnO

  • Mn2O7

  • Mn2O3

MCQ
रिकाम्या जागा भरा
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उत्तर

Pyrolusite ore is MnO2.

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2017-2018 (July) Set 1

व्हिडिओ ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्‍न

Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.


The complexion [Ni(CN)4]2- is:


Give reason for the following :  
Sulphur in vapour state shows paramagnetic behaviour. 


What happens to the domains in a ferromagnetic material in the presence of external magnetic field?


Substances which are weakly repelled in magnetic field are known as ____________.


When heated to high temperature, ferromagnetic substance changes to ____________.


Assertion: On heating ferromagnetic or ferrimagnetic substances, they become paramagnetic.

Reason: The electrons change their spin on heating.


Fe3O4 (magnetite) is an example of ___________.


Which one of the following would feel attraction when placed in magnetic field: Co2+, Ag+, Ti4+, Zn2+ 


The heat of combustion of a substance is:


Which of the following is not a ferroelectric compound?


Some of the polar crystals when heated produces small electrical current. This phenomenon is called ______.


Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion: Magnetic moment values of actinides are lesser than the theoretically predicted values.

Reason: Actinide elements are strongly paramagnetic.

Select the most appropriate answer from the options given below:


Which of the following statements are correct?

  1. Electric monopoles do not exist whereas magnetic monopoles exist.
  2. Magnetic field lines due to a solenoid at its ends and outside cannot be completely straight and confined.
  3. Magnetic field lines are completely confined within a toroid.
  4. Magnetic field lines inside a bar magnet are not parallel.
  5. χ = -1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptibility.

The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m is ______.

[permeability of the free space μ0 = 4π × 10-7 Wb/A - m]


The value of aluminium susceptibility is 2.2 × 10-5. The percentage increase in the magnetic field if space within a current carrying toroid is filled with aluminium is  `"x"/10^4`. Then the value of x is ______.


Among the following ions, which one has the highest paramagnetism?


Which of the following is not paramagnetic?


Which one of the following compounds is diamagnetic and colourless?


The metal complex ion that is paramagnetic is ______.

(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)


The calculated spin only magnetic moment of Cr2+ ion is ______.


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