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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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AR, BP, CQ
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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)

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

Knowledge Check

  • One type of artifical diamond (commonly called YAG for yttrium aluminium garnet) can be represented by the formula Y_(3)Al_(5)O_(12) [Y = 89, Al = 27] {:("Columnn I", "Column II"), ("(A) Y", "(P) 22.73%"), ("(B) Al", "(Q) 32.32%"), ("(C) O", "(R) 44.95%"):}

    A
    `A rarr R, B rarr P, C rarr Q`
    B
    `A rarr P, B rarr Q, C rarr R`
    C
    `A rarr P, B rarr R, C rarr Q`
    D
    `A rarr R, B rarr Q, C rarr P`

  • 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) ? The type of packing generated by type (I) is:

    A
    hexagonal close packing
    B
    squre close packing
    C
    cubic close packing
    D
    body centered packing

  • On passing 0.1 F of electricity through molten solution of. Al_(2)O_(3) amount of aluminium metal deposited at cathode is (Al = 27)

    A
    0.3 g
    B
    0.6 g
    C
    0.9 g
    D
    1.2 g

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    An intimate mixture of ferric oxide , Fe_(2)O_(3) , and aluminium, Al, is used in solid fuel rockets. Calculate the fuel value per gram and fuel value per cc. of the mixture . Heats of formation and densities are as follows :- DeltaH_(f) (Al_(2)O_(3))= 399kcal//mol , DeltaH_(f)(Fe_(2)O_(3))= 199kcal//mol Density of Fe_(2)O_(3)= 5.2 g//cc ,Density of Al = 2.7 g //cc.

    If 1/2 moles of oxygen combine with aluminium to form Al_(2)O_(3) then weight of Aluminium metal used in the reaction is (Al = 27 )

    One mole of potassium chlorate (KClO_(3)) is thernally decomposed and excess of aluminum is aluminium oxide (Al_(2)O_(3)) are formed?

    Assertion: Conc HNO_(3) can be stored in aluminium container. Reason: Aluminium reacts with conc HNO_(3) forming Al_(2)O_(3) which makes impervious coating on it and does not dissolve any more.

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