Some Basic Concepts of Chemistry

Which of the following has the largestnumber of moles?

1 L closed flask contains a mixture of 4 g of methane and 4.4 g of carbon dioxide. The pressure inside the flask at $27^{\circ} \mathrm{C}$ is [Assume ideal behaviour of gases]

In which mode of expression, the concentration of a solution remains independent of temperature?

A certain metal sulphide, $M S_2$, is used extensively as a high temperature lubricant. If $\mathrm{MS}_2$ is $40.06 \%$ by mass sulphur, metal $M$ has atomic mass?

The amount of $\mathrm{H}_{2} \mathrm{O}_{2}$ present in 1 litre of $1.5 \mathrm{~N} \mathrm{H}_{2} \mathrm{O}_{2}$ solution, is:

An ideal gaseous mixture of ethane $\left(\mathrm{C}_{2} \mathrm{H}_{6}\right)$ and ethene $\left(\mathrm{C}_{2} \mathrm{H}_{4}\right)$ occupies 28 litre at 1 atm and $273 \mathrm{~K}$. The mixture reacts completely…

If 0.2 gram of an organic compound containing carbon, hydrogen and oxygen on combustion, yielded 0.147 gram carbon dioxide and 0.12 gram water. What will be the content of oxygen in the substance?

In a compound $C, H$ and $N$ are present in $9:1:3\cdot 5$ by weight. If molecular weight of compound is $108$, the molecular formula of compound is

The empirical formula and molecular mass of a compound are ${\text{CH} }_{2}O$ and $180 g$ respectively. The molecular formula of the compound will be

Which of the following has the largest number of moles?

$0\cdot 765 g$ of an acid gives $0\cdot 535 g$ of ${\text{CO} }_{2}$ and $0\cdot 138 g$ of ${H}_{2}O$. Then, the ratio of percentage of carbon and hydrogen is

On electrolysis of water, a total of $1 \text{mole}$ of gases is evolved. The amount of water decomposed is