Le-blanc process is employed in the manufacture of
baking soda
washing soda
potash
plaster of Paris
In the first order reaction, 75% of the reactant gets disappeared in 1.386 h. The rate constant of the reaction is
3.0 10-3 s-1
2.8 10 -4 s-1
17.2 10-3 s-1
1.8 10-3 s-1
Which of the following is most basic in nature?
NH3
CH3NH2
(CH3)2NH
C6H5N(CH3)2
C.
(CH3)2NH
Basicity of amines depends upon the availability of lone pair of nitrogen for donation. Electron mreleasing group like -CH3 increases the basicity of amines by increasing electron density over nitrogen, which facilitate the donation of lone pair of electrons.
Electron withdrawing groups like -Ph group withdraws electrons and thus, make amines less basic by decreasing electron density over nitrogen. Hence, the order of basic nature of the given amines is
(CH3)2NH > C6H5N(CH3)2 > CH3NH2 > NH3
Thus, (CH3)2NH is most basic.
Which of the following is known as invert soap?
Pentaerythritol monostearate
Sodium stearyl sulphate
Trimethyl stearyl ammonium bromide
Ethoxylated nonyphenol
Which one of these is not true for benzene?
It forms only one type of mono-substituted product
There are three carbon-carbon single bonds and three carbon-carbon double bonds
Heat of hydrogenation of benzene is less than its theoretical value
The bond angle between carbon-carbon bonds is 120°