Question

please tell me chemistry ​

Answer 1

$\sf 1.~ \: Ca_3N_2 + 6H_2O \rightarrow \: 3Ca(HCO_3)_2 + 2NH_3$

2. Combination reaction

( as three compounds are combined to form a single compound )

3. Even being a combination reaction energy is absorbed as bonds of nitrogen and oxygen requires a lot of energy to break down , which makes it endothermic.

$\sf 4.~ \: 2AgBr \rightarrow 2Ag + Br_2$

5. The colour of the precipitate ( ferrous hydroxide) thus formed will be green.