Two elements gallium and oxygen combine to form a compound Ga₂O₃. Which among the following is the valency of gallium?

Match List I with List II and select the correct answer using the code given below the lists

Which one of the following contains maximum percentge of nitrogen by mass?

Which one of the following is used as moderator in nuclear reactors?

Consider the following equation for the formation of ammonia from nitrogen and hydrogen :

N₂+ 3H₂ = 2NH₃

How many hydrogen molecules are required to react with 100 molecules of nitrogen?

Which among the following is an element