SATHEE: Some Basic Concepts Of Chemistry Question 67

Some Basic Concepts Of Chemistry Question 67

Question: 2.0 g of a sample contains mixture of $S i O_{2}$ and $F e_{2} O_{3}$ . On very strong heating, it leaves a residue weighing 1.96 g. The reaction responsible for loss of mass is given below.

$F e_{2} O_{3} (s) \to F e_{3} O_{4} (s) + O (g),$ (unbalance equation) What is the percentage by mass of $S i O_{2}$ in original sample?

Options:

A) 100%

B) 20%

C) 40%

D) 60%

Show Answer

Answer:

Correct Answer: C

Solution:

[c] $3 F e_{2} O_{3} (s) t o 2 F e_{3} O_{4} + \frac{1}{2} O_{2}$ 480 g $F e_{2} O_{3}$ provide $16 g, O_{2}$ . For loss of $0.04 g O_{2} t o 0.04 \times \frac{480}{16} = 1.2 g, F e_{2} O_{3}$ % by mass of $S i O_{2} = \frac{0.8}{2.0} \times 100 = 40$ %

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Some Basic Concepts Of Chemistry Question 67

Question: 2.0 g of a sample contains mixture of SiO2 and Fe2O3 . On very strong heating, it leaves a residue weighing 1.96 g. The reaction responsible for loss of mass is given below.

Options:

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Solution:

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Question: 2.0 g of a sample contains mixture of $S i O_{2}$ and $F e_{2} O_{3}$ . On very strong heating, it leaves a residue weighing 1.96 g. The reaction responsible for loss of mass is given below.