On strong heating, `AgNO_(3)` produces the gases

Options

A. `NO_(2)` and NO
B. NO and `O_(2)`
C. `N_(2)O` and NO
D. `NO_(2)` and `O_(2)`

Answer

D

Explanation

Silver nitrate (Lunar caustic) is teachnically the mopst important of Ag compounds. It is prepared by dissolving metallic silver in dilute nitric acid:
`3Ag + 4HNO_(3)` `overset (Delta) rarr` `3AgNO_(3) + NO + 2H_(2)O`
(Dilute)
From solution it crystallizes as larger rhombic plates, mp. 482K. It is not hygroscopic and is very soluble is water. The solubility are susceptible to decomposition by light. Thus Ag `NO_(3)` is usually kept in amber-colored battles. When heated it decomposes in two stages: On heating above its melting points, it decomposes to silver nitrite and oxygen:
`2 AgNO_(3)` `overset (723K) rarr` `2AgNO_(2) + O_(2)`
when heated at red heat, it further decomposes to metallic silver.
`2AgNO_(3)` `overset (980K) rarr` `2 Ag + 2NO_(2) + O_(2)`
Sliver nitratre is also decomposed by organic matter, such as glucose, paper, skin, and crok. It has also a caustic and destructive effect on organic tissues. In contact with oranic substances it blackens due to decomposition into metallic silver. Thus, it leaves black stains when comes in contant with skin and clothes. It produces burning sensation like the moon luna on skin and thus, clled Lunar caustic. Largequantites of `AgNO_(3)` are used in the production of light sensitive plates, films and papers. in the laboratories it is extensively used as a group reagent as a medicine in nervous diseases. A solution of `AgNO_(3)` is used in marking lines. It is also used in silvering of mirror.