Mixtures and Alligation

A mixture of $HCOOH$ and $H_{2}C_{2}O_{4}$ is heated with conc. $H_{2}SO_{4}$. The gas produced is collected and on treating with $KOH$ solution, the volume of gas decreases by $\dfrac{1}{6}th$. Calculate the molar ratio of the two acids in original mixture.

A closed vessel contains 8 gm of oxgen 7 gm of nitrogen and 1 gm of hydrogen. The total pressure is 8 atmospheres at a given temperature. If now oxygen is removed without change in temperature the pressure of the remaining gas is

3 grams of $H_{2}$ and 24 grams of $O_{2}$ are present in a gaseous mixture at constant temperature and pressure. The partial pressure of $H_{2}$ is:

In a litre flask at a certain temperature, there are 2 gm of $H_{2}$ and 8 gm of $O_{2}$. The mole fraction of $O_{2}$ in the given mixture is:

The rate of diffusion of $2$ gases '$A$' and '$B$' are in the ratio $16:3$. If the ratio of their masses present in the mixture is $2:3$. Then:

A tin of paint of a particular shade of colour is a mixture of red, blue and yellow. $\displaystyle \frac{1}{4}$ of the total volume of paint is made up of red paint and the ratio of the volume of red paint to that of blue paint is 3 : 2. Find the total volume of paint that will contain 84 mL of yellow paint.

Two solutions of glucose, ${1}^{st}$ and ${2}^{nd}$ have osmotic pressure $1.5$ atm and $2.5$ atm, respectively. $1$ litre of ${1}^{st}$ solution is mixed with $2$ litres of ${2}^{nd}$ solution. The osmotic pressure for the resultant solution will be :

Equal volumes of two gases which do not react together are enclosed in separate vessels. Their pressures are 100 mm and 400 mm respectively. If the two vessels are joined together, then what will be the pressure of the resulting mixture (temperature remaining constant)?

$20 g$ water at$\ 20^o C$ is contained in a calorimeter. 10 g of water at $50^o C$ is mixed into it. Temperature of mixture would be :

How much water must be added to $300$ mL of $0.2$ M solution of ${ CH }{ 3 }COOH{ (K) }{ a }={ 1.8\times 10 }^{ -5 }$ for the degree of dissociation of the acid to double?

Boiling water at $100^{0}C$ and cold water at $t^{0}C$ are mixed in the ratio $1:3$ and the resultant maximum temperature was $27^0$C. Assuming no heat losses, the value of t is :

In a 20 litre flask, 60 litres of $N_{2}$ at 760 mm, 32 litres of $H_{2}$ at 740 mm are mixed. The total pressure of the mixture at the same temperature is :