Equal masses of oxygen and ozone are present in a container at 298 K. The ratio of their partial pressures ($P_{O_2} : P_{O_3}$) is:

Which of the following contains the greatest number of atoms?

Elements M and N form two compounds, $MN$ and $M_2N_3$. 0.5 moles of $MN$ weighs 25 g, and 0.1 moles of $M_2N_3$ weighs 13 g. Determine the atomic weights of M and N.

13.5 g aluminium changes to ${\rm{A}}{{\rm{l}}^{3 + }}ion$ in solution by losing :

What is the mass percent of carbon in $C{O_2}$

Volume occupied by $3.01 imes {10^{23}}\;\;$ molecules of acetylene at NTP is:

$26\,{\rm{mL}}$ of ${\rm{C}}{{\rm{O}}_2}$ are passed over hot coke. The maximum volume of CO formed is :

50 mL of a $\AgNO_3$ solution reacts completely with 50 mL of a 2.9% NaCl solution to form 3.587 g of AgCl precipitate. What is the percentage concentration of the $\AgNO_3$ solution?

0.3 g of an oxalate salt was dissolved in 100 mL solution. The solution required 90 mL of $N/20$ ${\rm{KMn}}{{\rm{O}}_4}$ for complete oxidation. The % of oxalate ion in salt is:

Elements A and B form two compounds $A_2B$ and $A_3B_2$. 0.2 moles of $A_2B$ weighs 20 g, and 0.1 moles of $A_3B_2$ weighs 18 g. Find the atomic weights of A and B.

In which of the following is the number of water molecules maximum?