Which of the following reagent(s) will be most suitable reagent to remove completely NO_(2)^(-) from the mixture of NO_(2)^(-) and NO_(3)^(-)?

Which of the following reagent(s) will be most suitable reagent to rem

1.	Which of the following reagent(s) will be most suitable reagent to remove completely NO_(2)^(-) from the mixture of NO_(2)^(-) and NO_(3)^(-)?
Answer» `NH_(4)CI` Urea Thiourea Sulphamic acid Answer :D