Answer:
There is only one proton because it has a molecular mass of one
I would go with C because that seems like the best answer choice
Answer:
Products are AgBr and KNO3
Answer:
The correct answer is: X is nitrogen dioxide, and Y is a metal oxide
Explanation:
Combustion of compound of containing nitrogen and metal will give nitrogen dioxide and metal oxide as product. During combustion reaction a compound reacts with oxygen in order to yield oxides of elements present in the compound.
The general equation is given as:

Hence, the correct answer is :X is nitrogen dioxide, and Y is a metal oxide.
The name of the positively charged nonmetal ion is changed to end in –ide, is not true of binary compounds.
Hope this help!