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Thiol group is present in :

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Arrange the following compounds in order of decreasing acidity:

A beam of unpolarised light of intensity $I_{0}$ is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of $45_{∘}$ relative to that of A. The intensity of the emergent light is:

The distance of the point (1, 0, 2) from the point of intersection of the line $3x−2 =4y+1 =12z−2 $and the plane x y + z = 16, is :

If the equations $x_{2}+2x+3=0$and $ax_{2}+bx+c=0,a,b,c∈R$, have a common root, then $a:b:c$is

If x, y, z are in A.P. and $tan_{−1}x,tan_{−1}yandtan_{−1}z$are also in A.P., then

Energy of an electron is given by $E=−2.178_{′}10_{−18}J$ Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be $(h=6.62×10_{?34}Jsandc=3.0×10_{8}ms_{?1})$

The following reaction is performed at 298 K. $2NO(g)+O_{2}(g)⇔2NO_{2}(g)$ The standard free energy of formation of $NO(g)$ is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of $NO_{2}(g)$ at 298 K ? $(K_{P}=1.6×10_{12})$

The area of the region described by $A={(x,y):x_{2}+y_{2}≤1$and $y_{2}≤1−x}$is