The oxide which contains an odd electron at the nitrogen atom is ..... .

When bauxite powder is mixed with coke and heated with nitrogen at $2075 \ K$,carbon monoxide and $x$ are formed. Which gas is produced when $x$ reacts with water?

The most acidic among the following compounds is

Given below are two statements :
Statement $-I :$ The pentavalent oxide of group $-15$ element,$E_2O_5$,is less acidic than trivalent oxide,$E_2O_3$,of the same element.
Statement $-II :$ The acidic character of trivalent oxide of group $15$ elements,$E_2O_3$,decreases down the group.
In light of the above statements,choose the most appropriate answer from the options given below.

Which one of the following combines with $Fe(II)$ ions to form a brown complex?

The number of $H$ atoms attached to the phosphorus atom in hypophosphorous acid is