Give reason for the following in one or two sentences :
“Solid carbon dioxide is known as dry ice.”

Explanation

a. `Snl_4` absorbs bleu light and reflects high proportion of orange or red . The ergy avbsorbed in this way causes he transfer of an electron from `I` to `Sn` which correspond to the temporary oxidation of `Sn (IV)` to `Sn(III)`. Sice transferring an electron to another atom is same as transferring a charge charge transfer complex is formed and due to whcih `Snl_4` is roange in colou.
b. Solid ice at `1` atm pressure sublimes i.e., changes form slid state to gaseou sate without liquefying . As a result , solid ice does not wet the surface and is known as dry ice .
c. In diamojnd each `C` atom si `sp^3` hybrdised and a C-atom si terahedrally bonded to foru other c-atoms whcih emans there is no unpaired electron left in the struture of diamond . Hence it is incer , whereas in graphite `C` is `sp^2` hyvbrised and ther si one upared eelctron on each `C` atom which is free and hence due to availabiluty of unpaired electrons grahite is reactive .
d. Nitrolim is `CaNCN` , i.e., calcium, into calcium carbonate and cyanamide .
`CaNCn + H_2 O +CO_2 rarr CaCO_2 darr + underset (Cyanamide) (H_2 N.CN)`
the ctyanamide then ghydrolyses into two steps :
i. `H_2 N.Cn +H_2O rarr H_2 underset (Urea) (NCONH_2)`
ii. ` H-2 CONH_2 +H_2O rarr 2NH_2 +CO_2 uarr`
Ammonia `(NH_3)` is converted into intrates by nitrifying vacterica . On account of its show conversion into intrates and `NH_3`, nitrolim or `CaNCN` acts as a goode nitrogenous fertiliser.