Which of the following organo - silicon compound on hydrolysis will give a three dimensional silicone ?
R3SiCl
RSiCl3
SiCl4
R2SiCl2
Oxidation number of sulphur in H2S2O8 is :
+6
+8
+21
+7
A.
+6
In H2S2O8 (morshall's acid) , two O - atom have - 1 oxidation state each (peroxide linkage) and rest six O - atom have - 2 oxidation state .Hence ,
2(+1) + 2x + 2(-1) + 6(-2) = 0
2 + 2x - 2 - 12 = 0
2x = 12
x = + 6
Half-life of radioactive substance is 4 days . Amount of the substance decayed in two days is :
1 -
20 %