Which of the following statements is not correct?

Options

A. The number of mols of lead nitrate needed to coagulate 2 mol of `[AgI]I^(-)` is `1//2`
B. Dalda is prepared from oils by reduction
C. The color of sky is due to wavelength of sacttered light
D. The basic principle of cottrell precipitator is neutralization of charge on colloidal particles.

Answer

A

Explanation

`2[AgI]I^(-)+Pb^(2+)rarrPbI_(2)+2AgI`
Thus, `2` moles of `[AgI]I^(-)` are coagulated by `1` mole of `Pb^(2+)` , i.e., `1` mole of `Pb(NO_(3))_(2)` Oils are esters of unsaturated fatty acids whereas dalda is ester of saturated fatty acids. The former are converted into the latter by catalytic hydrogenation. (i.e., reduction)
According to Rayleigh scattering law, scattering of light
`prop(1)/(lambda^(4))` . Thus, shorter wavelength radiation is scattered more intensely. Sky boks blue because blue component of white sunlight is scattered more intensely by the molecules and dust particles of the atmosphere.
In Cottrell's precipitator, the charged plates neutralise the change on the smoke particles which get precipitated.