Prof. Anil Thomas and Prof. Santosh Yadav Solutions for Chapter: Some Basic Concepts of Chemistry, Exercise 4: Evaluation Test

The number of gram-atom of oxygen in $6.02\times {10}^{24}$ of $\mathrm{CO}$ molecule is

A hydrocarbon contains $80\%$ carbon. What is the empirical formula of the compound?

Which of the following drug-ailment pairs is correct?

The magnitude of 'femto' is

The number of moles in $\text{'}\mathrm{y}\text{'} \mathrm{gram}$ of helium gas is equal to -

Which of the following is not a fundamental $\mathrm{SI}$ unit?

For a reaction $\mathrm{A}+3\mathrm{B}\to \mathrm{C}+\mathrm{D}$, the amount of $\mathrm{C}$ formed by starting the reaction with $5$ moles of $\mathrm{A}$ and $9$ moles of $\mathrm{B}$ is

In an experiment, $2.16 \mathrm{g}$ of copper was dissolved in nitric acid followed by ignition of the nitrate, which gave $2.70 \mathrm{g}$ of copper oxide. In another experiment, $1.46 \mathrm{g}$ of copper on heating in a current of air gave $1.83 \mathrm{g}$ of copper oxide. The percentage of copper in copper oxide is ____ and the above data illustrate the law of ____.