Advertisements
Advertisements
प्रश्न
Analysis shows that nickel oxide has the formula Ni0.98O1.00. What fractions of nickel exist as Ni2+ and Ni3+ ions?
Advertisements
उत्तर
The formula Ni0.98O1.00 indicates that 98 Ni atoms are associated with 100 O atoms. Suppose,
Number of Ni atoms present as Ni2+ = x
∴ Number of Ni atoms present as Ni3+ = 98 − x
Since nickel oxide is electrically neutral, the total charge present on x Ni2+ ions and (98 − x) Ni3+ ions should be equal to the total charge present on 100 O2− ions. Therefore, we have
(x × 2) + (98 − x) × 3 = 100 × 2
or 2x + 294 − 3x = 200
or x = 94
∴ Fraction of Ni present as Ni2+ = `94/98 xx 100`
= 95.9
= 96%
and fraction of Ni present as Ni3+ = `(98 - 94)/98 xx 100`
= 4.08
= 4%
संबंधित प्रश्न
What is ferromagnetism?
What type of magnetism is shown in the following alignment of magnetic moments?
Define the following term:
Ferromagnetism
Write the type of magnetism observed when the magnetic moments are oppositely aligned and cancel out each other.
Write the type of magnetism observed when the magnetic moments are aligned in parallel and anti-parallel directions in unequal numbers.
Explain the following with suitable examples:
Ferrimagnetism
Explain the following with suitable examples:
Antiferromagnetism
Give reasons:Ferrimagnetic substances show better magnetism than antiferromagnetic substances.
Give reason for the following :
Sulphur in vapour state shows paramagnetic behaviour.
The BH curve for a ferromagnetic material is shown in the figure. The material is placed inside a long solenoid which contains 1000 turns/cm. The current that should be passed in the solenonid to demagnetize the ferromagnet completely is
Give the properties of dia/para/ferromagnetic materials.
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
Fe3O4 (magnetite) is an example of ___________.
Which of the following statements is not true?
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.
Which one of the following pairs has only paramagnetic species?
Magnetic materials used for making permanent magnets (P) and magnets in a transformer (T) have different properties of the following, which property best matches for the type of magnet required ?
Among the following ions, which one has the highest paramagnetism?
Which of the following is not paramagnetic?
Give a reason for the following:
Cu+2 salts are paramagnetic, while Cu+ salts are diamagnetic.
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 ______.
