Elements X and Y form compounds $XY_2$ and $X_3Y_2$. If 20 g of $XY_2$ contains 0.2 moles and 18 g of $X_3Y_2$ contains 0.1 moles. What are the atomic weights of elements X and Y?

A 0.50 $M$ solution of $KI$ reacts with excess of ${{\rm{H}}_2}{\rm{S}}{{\rm{O}}_4}$ and ${\rm{KI}}{{\rm{O}}_3}$ solutions according to the equation, $6{{\rm{H}}^ + } + 5{{\rm{I}}^ - } + {\rm{IO}}_3^ - o 3{{\rm{I}}_2} + 3{{\rm{H}}_2}{\rm{O}}$. Which of the following statements is true?

Suppose the elements X and Y combine to form two compounds $X{Y_2}$ and ${X_3}{Y_2}$. When 0.1 mole of $X{Y_2}$ weights 10 g and 0.05 mole of ${X_3}{Y_2}$ weights 9 g, the atomic weights of X and Y are

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

Two elements P and Q react to form compounds with formulas $PQ_2$ and $P_2Q$. If 0.1 mole of $PQ_2$ weighs 5 g and 0.2 mole of $P_2Q$ weighs 14 g, what are the atomic masses of P and Q?

If you have 8g of He, 4g of $H_2$, and 32g of $O_2$, which sample has the highest number of molecules?

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

What mass of AgCl is precipitated when 25 mL of a 8.45% $\AgNO_3$ solution is mixed with 50 mL of a 5.8% NaCl solution?

Arrange the following in increasing order of the number of atoms present:

(i) 2 g of He

(ii) 4 g of $H_2$

(iii) 8 g of $O_2$

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.