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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Which of the following statements is not true? - Chemistry

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प्रश्न

Which of the following statements is not true?

पर्याय

  • Paramagnetic substances are weakly attracted by magnetic field.

  • Ferromagnetic substances cannot be magnetised permanently.

  • The domains in antiferromagnetic substances are oppositely oriented with respect to each other.

  • Pairing of electrons cancels their magnetic moment in the diamagnetic substances.

MCQ
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उत्तर

Ferromagnetic substances cannot be magnetised permanently.

Explanation:

Ferromagnetic species are strongly attracted in the magnetic field and can be permanently magnetised.

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पाठ 1: Solid States - Exercises [पृष्ठ ६]

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एनसीईआरटी एक्झांप्लर Chemistry [English] Class 12
पाठ 1 Solid States
Exercises | Q I. 30. | पृष्ठ ६

संबंधित प्रश्‍न

Define the following term:

Ferromagnetism


Analysis shows that nickel oxide has the formula Ni0.98O1.00. What fractions of nickel exist as Ni2+ and Ni3+ ions?


Explain the following with suitable examples:

Ferrimagnetism


Explain why:
(i) Transition elements form coloured compounds. 
(ii) Interhalogen compounds are more reactive than their constituent elements.
(iii) Cu+ is diamagnetic but Cu2+ is paramagnetic. (Z = 29)


Pyrolusite ore is _______.


Out of [CoF6]3- and [Co(en)3]3+, which one complex is
(i) paramagnetic
(ii) more stable
(iii) inner orbital complex and
(iv) high spin complex
(Atomic no. of Co = 27) 


Give the properties of dia/para/ferromagnetic materials.


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


Example of ferromagnetic substance is ____________.


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


All those atoms or molecules which have an odd number of electrons are


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


The value of magnetic moment is zero in the case of antiferromagnetic substances because the domains:

(i) get oriented in the direction of the applied magnetic field.

(ii) get oriented opposite to the direction of the applied magnetic field.

(iii) are oppositely oriented with respect to each other without the application of magnetic field.

(iv) cancel out each other’s magnetic moment.


Which of the following statements are correct?

(i) Ferrimagnetic substances lose ferrimagnetism on heating and become paramagnetic.

(ii) Ferrimagnetic substances do not lose ferrimagnetism on heating and remain ferrimagnetic.

(iii) Antiferromagnetic substances have domain structures similar to ferromagnetic substances and their magnetic moments are not cancelled by each other.

(iv) In ferromagnetic substances all the domains get oriented in the direction of magnetic field and remain as such even after removing magnetic field.


The heat of combustion of a substance is:


The correct order of bond strength is ______.


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]


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


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