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The number of manganese ions in tetrahedral and octahedral sites, respectively in Mn3O4 are

The number of manganese ions in tetrahedral and octahedral sites, respectively in Mn3O4 are Correct Answer one Mn<sup>2+</sup> and two Mn<sup>3+</sup>

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The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the most logical order of sentences from among the options. P: Young boys and girls seem to have become inordinately addicted to these sites. Q: The parents, teachers and the government must look into the problems being caused by these networking sites and must formulate a strategy either to curb or completely stop its fast growing negative influence on the minds of our youth. R: Smart-phones, computers, social media, internet and networking sites such as Facebook and Twitter have become source of major distractions for students. S: They are thoughtlessly and uselessly wasting their precious time on these sites.
The question below consists of a set of labelled sentences. These sentences, when properly sequenced form a coherent paragraph. Select the mostlogical order of sentences from among the options. P: Young boys and girls seem to have become inordinately addicted to these sites.
Q: The parents, teachers and the government must look into the problems being caused by these networking sites and must formulate a strategy either to curb or completely stop its fast growing negative influence on the minds of our youth.
R: Smart-phones, computers, social media, internet and networking sites such as Facebook and Twitter have become source of major distractions for students.
S: They are thoughtlessly and uselessly wasting their precious time on these sites.
If N is the number of tetrahedral voids in a close-packed structure, then the number of octahedral voids is:
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