Subject :NSO Class : Class 9
P and Q are two non-metals. If the ratio of number
of P atoms to the total number of atoms in its oxide
is 0.33 and that for Q is 0.25 then, the valencies of
P and Q are respectively
A 2 and 3
B 3 and 6
C 1 and 2
D 4 and 6.