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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 $(h=6.62×10_{?34}Jsandc=3.0×10_{8}ms_{?1})$

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Which of the following complex species is not expected to exhibit optical isomerism?

A long cylindrical shell carries positive surface charge $σ$ in the upper half and negative surface charge $−σ$ in the lower half. The electric field lines around the cylinder will look like figure given in : (figure are schematic and not drawn to scale)

The set of all values of $λ$for which the system of linear equations : $2x_{1}−2x_{2}+x_{3}=λx_{1}$$2x_{1}−3x_{2}+2x_{3}=λx_{2}$$−x_{1}+2x_{2}=λx_{3}$has a non-trivial solution,

The equation of the circle passing through the foci of the ellipse $16x_{2} +9y_{2} =1$, and having centre at (0, 3) is

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

Let a, b, c and d be non-zero numbers. If the point of intersection of the lines $4ax+2ay+c=0$and $5bx+2by+d=0$ lies in the fourth quadrant and is equidistant from the two axes then

Let $AandB$ be two sets containing four and two elements respectively. Then the number of subsets of the set $A×B,$ each having at least three elements is :

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