1.

Which of the following combinations illustrates laws of reciprocal ?

Answer»

`N_20_3 ,N_2O_4 , N_2O_5`
`PH_3 , P_2O_5 , P_2S_5`
`CS_2, CO_2 , SO_2`
NACL , NABR , NaI

Answer :C


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