JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry / रसायन की कुछ मूलभूत अवधारणाएँ Question Bank Self Evaluation Test - Some Basic Concepts of Chemistry

2g of a mixture of CO and \[C{{O}_{2}}\] on reaction with excess \[{{I}_{2}}{{O}_{5}}\] produced 2.54 g of \[{{I}_{2}}\]. What will be the mass % of \[C{{O}_{2}}\] in the original mixture?

A) 35

B) 70

C) 30

D) 60

Correct Answer: C

Solution :

[c] \[5CO+{{I}_{2}}{{O}_{5}}\to 5C{{O}_{2}}+{{I}_{2}}\]

Moles of\[{{I}_{2}}{{O}_{5}}=\frac{25.4}{254}\]\[=0.01=0.05\text{ }moles\text{ }of\text{ }CO\]

Weight of \[CO=0.05\times 28=1.4\text{ }g;\]

Weight of \[C{{O}_{2}}=2-1.4=0.6g\]

Hence % of \[C{{O}_{2}}=\frac{0.6}{2}\times 100=30%\]%