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One type of artifical diamond (commonly ...

One type of artifical diamond (commonly called YAG for yttrium aluminium garnet) can be represeted by the formula `Y_(3)Al_(5)O_(12).[Y=89, Al=27]`

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One type of artificial diamond (commonly called YAG for yttrium aluminium garnet) can be represented by the formula Y_(3)Al_(5)O_(12) (a) Calculate the weight percentage composition of this compound. (b) What is the weight of yttrium present in a 200 - carat YAG if 1 carat -200mg ? (Y=89),Al=27)

A spinal is an important class of oxides consisting of two types of metal ions with oxides ions arranged in CCP layer. The normal spinal has one-eighth of the tetrahedral holes occupied by one type of metal ion and one-half of the octahedral holes occupied by another type of metal ion. such a spinal is formed by Zn^(2+), Al^(3+) and O^(2-) in the tetrahedral holes. if formula of the compound is Zn_(x)Al_(y) O_(z) , then find the value of (x + y + z) ?

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  • A compound X, of boron reacts with NH_(3) on heating to give another compound Y which is called inorganic benzene. The compound X can be prepared by treating and Y are represented by the formula.

    A
    `B_(2)H_(6), B_(3)N_(3)H_(6)`
    B
    `B_(2)O_(3),B_(3)N_(3)H_(6)`
    C
    `BF_(3),B_(3)N_(3)H_(6)`
    D
    `B_(3)N_(3)H_(6), B_(2)H_(6)`

  • A compound X with molecular formula C_(3)H_(8)O can be oxidized to a compound Y with the molecular formula C_(3)H_(6)O_(2).X is most likely to be a :

    A
    primary alcohol
    B
    secondary alcohol
    C
    aldehyde
    D
    ketone

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    What is the percentage of aluminium in Al_(2)O_(3) ? (Al = 27, O = 16)

    A chemical commonly called "dioxin" has been very much in the news in the past few years. (It is the by product of herbicide manufacture and is thought to be quite toxic.) Its formula is C_(12)H_(4)Cl_(4)O_(2) . If you have a sample of dirt (28.3 g) that contains 1.0xx10^(-4)% dioxin, how many moles of dioxin are in the dirt sample?

    A compound X with moleuclar formula C_(3)H_(8)O can be oxidized to a compoud Y with the molecular formula C_(3)H_(6)O_(2) . X is most likely to be a:

    A spinel is an important class of oxide consisting two types of metal ions withs the oxide ions arranged in ccp layers . The normal spinel has one -eight of the tetrahendral holes occupied by one type of metal ions and one- half of the octaherdral holes occupied by another type of metal ion. Such a spine is formed by Mg^(2+), Al^(3+) and O^(2-) . The netutrality of the crystal is benig maintained. If oxide ion is replaced by X^(-8//3) , the number of anionic vacancy per unit cells is :

    Compounds having same molecular formula but different connectivity of atoms or groups are called structure isomers. Structrue isomers are futher classify according to their dissimilarities. In the following skelton Z can be, if the molecular formula is C_(5)H_(10)O_(2) : CH_(3)-CH_(2)-undersetunderset(Z)(|)(CH)-CH_(3) (i)A carboxylic acid , (ii)An ester (iii)Hydroxyaldehyde , (iv)Alkanediol

    Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Anodising can be done by elecrolysing dil H_(2)SO_(4) with Al as anode. This results in :

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