318824
Experimentally it was found that a metal oxide has formula \(M_{0.98} O_{1}\). Metal \(\mathrm{M}\), is present as \(M^{2+}\) and \(M^{3+}\), fraction of the metal which exists as \(M^{3+}\) would be:
1 \(6.05 \%\)
2 \(4.08 \%\)
3 \(5.08 \%\)
4 \(7.01 \%\)
Explanation:
Let number of \(M^{3+}\) ions is ' \(x\) ', then the number of \(M^{2+}\) ions will be \((0.98-x)\). Net charge of oxide will be zero. \(\therefore+2(0.98-x)+3(x)+(-2) 1=0\) \(1.96+x-2=0\) \(x=0.04\) Percentage of \(M^{3+}=\dfrac{0.04}{0.98} \times 100=4.08 \%\)
CHXII01:THE SOLID STATE
318825
Non-stoichiometry defect due to the presence of extra cations in interstitial sites is exhibited by the crystals which are likely to exhibit
1 Schottky defect
2 Frenkel defect
3 Stoichiometric defect
4 F-centres
Explanation:
In Frenkel defect, constituent particles occupy interstitial position.
CHXII01:THE SOLID STATE
318826
A metal exists as an oxide with formula \(\mathrm{M}_{0.96} \mathrm{O}\). Metal \(\mathrm{M}\) can exist as \(\mathrm{M}^{+2}\) and \(\mathrm{M}^{+3}\) in its oxide \(M_{0.96} O\). The percentage of \(M^{+3}\) in the oxide is, nearly
1 \(4.6 \%\)
2 \(5 \%\)
3 \(9.6 \%\)
4 \(8.3 \%\)
Explanation:
The formula of metal oxide is \(\mathrm{M}_{0.96} \mathrm{O}\) or \(=\mathrm{M}_{96} \mathrm{O}_{100}\). Let the number of \(\mathrm{O}^{2-}\) ion \(=100\) Let the number of \(\mathrm{M}^{2+}\) ions be \(\mathrm{x}\) then number of \(\mathrm{M}^{3+}\) ions will be \((96-\mathrm{x})\) For electrical neutrality. Positive charge on the compound \(=\) Negative charge on the compound \[ \begin{gathered} \therefore 2 x+(96-x) 3=2 \times 100 \\ 2 x+288-3 x=200 \\ x=88 \end{gathered} \] Number of \(\mathrm{M}^{3+}\) ions \(=96-88=8\) \[ \% \text { of } \mathrm{M}^{3+} \text { ions }=\dfrac{8}{96} \times 100=8.3 \% \]
KCET - 2020
CHXII01:THE SOLID STATE
318827
Which is the Incorrect statement?
1 Density decreases in case of crystals with Schottky's defect.
2 \(\mathrm{NaCl}(\mathrm{s})\) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
3 Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
4 \(\mathrm{FeO}_{0.98}\) has non stoichiometric metal deficiency defect.
Explanation:
In Frenkel defect the radius of cation must be very less than anion. Incorrect statement is (3)
318824
Experimentally it was found that a metal oxide has formula \(M_{0.98} O_{1}\). Metal \(\mathrm{M}\), is present as \(M^{2+}\) and \(M^{3+}\), fraction of the metal which exists as \(M^{3+}\) would be:
1 \(6.05 \%\)
2 \(4.08 \%\)
3 \(5.08 \%\)
4 \(7.01 \%\)
Explanation:
Let number of \(M^{3+}\) ions is ' \(x\) ', then the number of \(M^{2+}\) ions will be \((0.98-x)\). Net charge of oxide will be zero. \(\therefore+2(0.98-x)+3(x)+(-2) 1=0\) \(1.96+x-2=0\) \(x=0.04\) Percentage of \(M^{3+}=\dfrac{0.04}{0.98} \times 100=4.08 \%\)
CHXII01:THE SOLID STATE
318825
Non-stoichiometry defect due to the presence of extra cations in interstitial sites is exhibited by the crystals which are likely to exhibit
1 Schottky defect
2 Frenkel defect
3 Stoichiometric defect
4 F-centres
Explanation:
In Frenkel defect, constituent particles occupy interstitial position.
CHXII01:THE SOLID STATE
318826
A metal exists as an oxide with formula \(\mathrm{M}_{0.96} \mathrm{O}\). Metal \(\mathrm{M}\) can exist as \(\mathrm{M}^{+2}\) and \(\mathrm{M}^{+3}\) in its oxide \(M_{0.96} O\). The percentage of \(M^{+3}\) in the oxide is, nearly
1 \(4.6 \%\)
2 \(5 \%\)
3 \(9.6 \%\)
4 \(8.3 \%\)
Explanation:
The formula of metal oxide is \(\mathrm{M}_{0.96} \mathrm{O}\) or \(=\mathrm{M}_{96} \mathrm{O}_{100}\). Let the number of \(\mathrm{O}^{2-}\) ion \(=100\) Let the number of \(\mathrm{M}^{2+}\) ions be \(\mathrm{x}\) then number of \(\mathrm{M}^{3+}\) ions will be \((96-\mathrm{x})\) For electrical neutrality. Positive charge on the compound \(=\) Negative charge on the compound \[ \begin{gathered} \therefore 2 x+(96-x) 3=2 \times 100 \\ 2 x+288-3 x=200 \\ x=88 \end{gathered} \] Number of \(\mathrm{M}^{3+}\) ions \(=96-88=8\) \[ \% \text { of } \mathrm{M}^{3+} \text { ions }=\dfrac{8}{96} \times 100=8.3 \% \]
KCET - 2020
CHXII01:THE SOLID STATE
318827
Which is the Incorrect statement?
1 Density decreases in case of crystals with Schottky's defect.
2 \(\mathrm{NaCl}(\mathrm{s})\) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
3 Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
4 \(\mathrm{FeO}_{0.98}\) has non stoichiometric metal deficiency defect.
Explanation:
In Frenkel defect the radius of cation must be very less than anion. Incorrect statement is (3)
318824
Experimentally it was found that a metal oxide has formula \(M_{0.98} O_{1}\). Metal \(\mathrm{M}\), is present as \(M^{2+}\) and \(M^{3+}\), fraction of the metal which exists as \(M^{3+}\) would be:
1 \(6.05 \%\)
2 \(4.08 \%\)
3 \(5.08 \%\)
4 \(7.01 \%\)
Explanation:
Let number of \(M^{3+}\) ions is ' \(x\) ', then the number of \(M^{2+}\) ions will be \((0.98-x)\). Net charge of oxide will be zero. \(\therefore+2(0.98-x)+3(x)+(-2) 1=0\) \(1.96+x-2=0\) \(x=0.04\) Percentage of \(M^{3+}=\dfrac{0.04}{0.98} \times 100=4.08 \%\)
CHXII01:THE SOLID STATE
318825
Non-stoichiometry defect due to the presence of extra cations in interstitial sites is exhibited by the crystals which are likely to exhibit
1 Schottky defect
2 Frenkel defect
3 Stoichiometric defect
4 F-centres
Explanation:
In Frenkel defect, constituent particles occupy interstitial position.
CHXII01:THE SOLID STATE
318826
A metal exists as an oxide with formula \(\mathrm{M}_{0.96} \mathrm{O}\). Metal \(\mathrm{M}\) can exist as \(\mathrm{M}^{+2}\) and \(\mathrm{M}^{+3}\) in its oxide \(M_{0.96} O\). The percentage of \(M^{+3}\) in the oxide is, nearly
1 \(4.6 \%\)
2 \(5 \%\)
3 \(9.6 \%\)
4 \(8.3 \%\)
Explanation:
The formula of metal oxide is \(\mathrm{M}_{0.96} \mathrm{O}\) or \(=\mathrm{M}_{96} \mathrm{O}_{100}\). Let the number of \(\mathrm{O}^{2-}\) ion \(=100\) Let the number of \(\mathrm{M}^{2+}\) ions be \(\mathrm{x}\) then number of \(\mathrm{M}^{3+}\) ions will be \((96-\mathrm{x})\) For electrical neutrality. Positive charge on the compound \(=\) Negative charge on the compound \[ \begin{gathered} \therefore 2 x+(96-x) 3=2 \times 100 \\ 2 x+288-3 x=200 \\ x=88 \end{gathered} \] Number of \(\mathrm{M}^{3+}\) ions \(=96-88=8\) \[ \% \text { of } \mathrm{M}^{3+} \text { ions }=\dfrac{8}{96} \times 100=8.3 \% \]
KCET - 2020
CHXII01:THE SOLID STATE
318827
Which is the Incorrect statement?
1 Density decreases in case of crystals with Schottky's defect.
2 \(\mathrm{NaCl}(\mathrm{s})\) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
3 Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
4 \(\mathrm{FeO}_{0.98}\) has non stoichiometric metal deficiency defect.
Explanation:
In Frenkel defect the radius of cation must be very less than anion. Incorrect statement is (3)
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CHXII01:THE SOLID STATE
318824
Experimentally it was found that a metal oxide has formula \(M_{0.98} O_{1}\). Metal \(\mathrm{M}\), is present as \(M^{2+}\) and \(M^{3+}\), fraction of the metal which exists as \(M^{3+}\) would be:
1 \(6.05 \%\)
2 \(4.08 \%\)
3 \(5.08 \%\)
4 \(7.01 \%\)
Explanation:
Let number of \(M^{3+}\) ions is ' \(x\) ', then the number of \(M^{2+}\) ions will be \((0.98-x)\). Net charge of oxide will be zero. \(\therefore+2(0.98-x)+3(x)+(-2) 1=0\) \(1.96+x-2=0\) \(x=0.04\) Percentage of \(M^{3+}=\dfrac{0.04}{0.98} \times 100=4.08 \%\)
CHXII01:THE SOLID STATE
318825
Non-stoichiometry defect due to the presence of extra cations in interstitial sites is exhibited by the crystals which are likely to exhibit
1 Schottky defect
2 Frenkel defect
3 Stoichiometric defect
4 F-centres
Explanation:
In Frenkel defect, constituent particles occupy interstitial position.
CHXII01:THE SOLID STATE
318826
A metal exists as an oxide with formula \(\mathrm{M}_{0.96} \mathrm{O}\). Metal \(\mathrm{M}\) can exist as \(\mathrm{M}^{+2}\) and \(\mathrm{M}^{+3}\) in its oxide \(M_{0.96} O\). The percentage of \(M^{+3}\) in the oxide is, nearly
1 \(4.6 \%\)
2 \(5 \%\)
3 \(9.6 \%\)
4 \(8.3 \%\)
Explanation:
The formula of metal oxide is \(\mathrm{M}_{0.96} \mathrm{O}\) or \(=\mathrm{M}_{96} \mathrm{O}_{100}\). Let the number of \(\mathrm{O}^{2-}\) ion \(=100\) Let the number of \(\mathrm{M}^{2+}\) ions be \(\mathrm{x}\) then number of \(\mathrm{M}^{3+}\) ions will be \((96-\mathrm{x})\) For electrical neutrality. Positive charge on the compound \(=\) Negative charge on the compound \[ \begin{gathered} \therefore 2 x+(96-x) 3=2 \times 100 \\ 2 x+288-3 x=200 \\ x=88 \end{gathered} \] Number of \(\mathrm{M}^{3+}\) ions \(=96-88=8\) \[ \% \text { of } \mathrm{M}^{3+} \text { ions }=\dfrac{8}{96} \times 100=8.3 \% \]
KCET - 2020
CHXII01:THE SOLID STATE
318827
Which is the Incorrect statement?
1 Density decreases in case of crystals with Schottky's defect.
2 \(\mathrm{NaCl}(\mathrm{s})\) is insulator, silicon is semiconductor, silver is conductor, quartz is piezo electric crystal.
3 Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.
4 \(\mathrm{FeO}_{0.98}\) has non stoichiometric metal deficiency defect.
Explanation:
In Frenkel defect the radius of cation must be very less than anion. Incorrect statement is (3)
