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Law of Conservation of Mass

If the masses...

Question

If the masses of Cr and O are in ratio 13:12 in Cr03,then the ratio of O that combines with the same mass of Cr in Cr2O3 and Cr2O7 is 1)1:2 2)1:4 3)3:7 4)2:5

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(X) a n d (Y)

(A) a n d (B)

(X)

(Y)

3 : 7

(A)

4 g

(X)

12 g

(Y)

(B)

8 g

(X)

g

(Y)

\begin{matrix} i) \frac{2}{3} \times 2 \frac{2}{3} = . . . . . . . . . . . . . . . . i i) \frac{4}{6} \times \frac{13}{7} = . . . . . . . . . . . . . . . . i i i) \frac{11}{3} \times \frac{4}{10} = . . . . . . . . . . . . . i v) \frac{2}{5} \times 5 \frac{1}{4} = . . . . . . . . . . . . . v) 3 \frac{4}{7} \times \frac{3}{5} = . . . . . . . . . . . . . . \end{matrix}

3 : 7

4 g

12 g

8 g

g

\begin{matrix} i) 12 \div \frac{4}{3} = i i) 34 \div \frac{17}{3} = i i i) 9 \div \frac{3}{8} = i v) 88 \div 1 \frac{5}{6} = v) 42 \div 1 \frac{1}{5} = v i) 15 \div \frac{5}{6} = v i i) 35 \div \frac{7}{11} = v i i i) 28 \div 1 \frac{1}{4} = i x) 39 \div \frac{13}{12} = x) 63 \div 1 \frac{1}{8} = \end{matrix}

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