Two gases `A` and `B` which react according to the equation
`aA_((g)) +bB_((g)) rarr cC_((g)) +dD_((g))`
to give two gases `C` and `D` are taken (amount not known) in an Eudiometer tube (operating at a constant Pressur and temperature) to cause the above.
If one causing the reaction there is no volume change observed then which of the following statement is/are correct.

Options

A. (a + b) = (c + d)
B. average molecular mass may increase or decrease if either of A or B is present in limited amount.
C. Vapour Density of the mixture will remain same throughout the course of reaction.
D. Total moles of all the component of mixture will change.

Answer

A, C