class 12

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Let $I=∫_{0}x sin dxandJ=∫_{0}x cosx dx$Then which one of the following is true?

Three sound waves of equal amplitudes have frequencies $(v−1),v,(v+1)$. They superpose to give beats. The number of beats produced per second will be

If A, B and C are three sets such that $A∩B=A∩C$and $A∪B=A∪C$, then

Gold numbers of protective colloids A, B, C and D are 0.50, 0.01, 0.10 and 0.005, respectively. The correct order of their protective powers is

Knowing that the Chemsitry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements in incorrect ?

Consider a family of circles which are passing through the point $(−1,1)$and are tangent to x-axis. If (h, k) are the co-ordinates of the centre of the circles, then the set of values of k is given by the interval

Which one of the following constitutes a group of the isoelectronic species ?

Which one of the following reactions of Xenon compounds is not feasible ?