KVPY SA Exam 19-Nov-2017 Question Paper

Question : 45 of 80

Marks: +1, -0

1.25 g of a metal (M) reacts with oxygen completely to produce 1.68 g of metal oxide. The empirical formula of the metal oxide is
[molar mass of M and O are 69.7 g mol

^{–1}

and 16.0 g mol

^{–1}

, respectively]

$M_2O$
$M_2O_3$
$MO_2$
$M_3O_4$

Validate

Solution:

M↙{1.25 } + O_2\ { ––––▸} {MO}↙{1.68}

⇒

1.25/E=1.68/{E+8}

⇒ E = 23.25
n - factor =

69.7/23.25≈3

∴ Emprical formula =

M_2O_3

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