Select all that apply.

when a double displacement reaction takes place, one of the products must be

a precipitate
a gas
water
a salt

The main products must be obtained during double displacement reaction are a precipitate and a gas

Option: A and B

Explanation:

"Double displacement reaction" is one of the types of chemical reactions. It is a process in which one component each of both the reacting molecules get exchanged to form the products which is precipitate obtained from mother liquor while rest is filtrate. Following is the reaction:

A Chemical bond responsible for holding the product as such may be covalent or ionic. Also called as "salt metathesis reaction" or double decomposition reaction. One of the examples are as follows where "aqueous solution" of silver nitrate is combined with sodium chloride and result in a curdy "white precipitate" of silver chloride:

explanation:

two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.