Question

When x grams of carbon are heated with y grams of oxygen in a closed vessel, no solid residue is left behind. Which of the following statements is correct?

• A. y/x must lie between 1.33 and 2.67
• B. y/x must be greater than or equal 2.67
• C. y/x must be less than or equal 1.33
• D. y/x must be greater than or equal 1.33

Answer 1

The correct option is A y/x must lie between 1.33 and 2.67

(i) Where $C{O}_2$ formed

$C+O_2\to C{O}_2$

$x$ $y$

$=12$ $=32$

$\therefore \frac{y}{x}=\frac{32}{12}=2.667\simeq 2.67$

(ii) When $CO$ is formed

$C+\frac{1}{2}{O}_2\to C{O}_2$

$x$ $y$

$=12$ $=16$

$\therefore \frac{y}{x}=\frac{16}{12}=1.33$

$\therefore \frac{y}{x}$ between $1.33$ and $2.67$

$\left(A\right)$ Option