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The number of S =O and S-OH bonds present in peroxodisulphuric acid and pyrosulphuric acid respectively are :

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Match List-I (Electromagnetic wave type) with List-II (Its association/application) and select the correct option from the choice given below the lists :

If a piece of metal is heated to temperature $θ$ and then allowed to cool in a room which is at temperature $θ_{0}$ the graph between the temperature T of the metal and time t will be closest to :

Given : A circle, $2x_{2}+2y_{2}=5$and a parabola, $y_{2}=45 x$.Statement - I : An equation of a common tangent to these curves is $y=x+5 $Statement - II : If the line, $y=mx+m5 (m=0)$is their common tangent, then m satisfies $m_{4}−3m_{2}+2=0.$

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:

A pendulum made of a uniform wire of cross sectional are A has time period T. When an additional mass M is added to its bob, the time period changes to $T_{M}$. If the Young's modulus of the material of the wire is Y then $Y1 $ is equal to : (g = gravitational acceleration)

In a hydrogen like atom electron makes transition from an energy level with quantum number n to another with quantum number (n - 1). If $n>>1,$ the frequency of radiation emitted is proportional to

Let A and B be two events such that $p(A∪B)=61 ,p(A∩B)=41 $ and $p(A)=41 $, where $A$stands for thecomplement of the event A. Then the events A and B are

A solution of (-) –1 - chloro - 1 - phenylethane is toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of :