The catalyst used in the contact process is

Explain the nature of oxides of group-$16$ elements. Write a note on halide compounds of group-$16$ elements. Write a note on hydride compounds of group-$16$ elements.

The compound$(s)$ having peroxide linkage is(are):
$(A)$ $H_2S_2O_7$
$(B)$ $H_2S_2O_8$
$(C)$ $H_2S_2O_5$
$(D)$ $H_2SO_5$

Discuss the chemical properties of Group $16$ elements.

Discuss the anomalous behaviour of oxygen.

When conc. $H_{2}SO_{4}$ is heated with $P_{2}O_{5}$,the acid is converted into