class 12

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JEE Main

Higher order $(>3)$ reactions are rare due to :

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If $A=⎣⎡ 12a 212 2−2b ⎦⎤ $ is a matrix satisfying the equation $AA_{T}=9I$, where $I$ is $3×3$ identity matrix, then the ordered pair $(a,b)$ is equal to :(A) $(2,−1)$ (B) $(−2,1)$ (C) $(2,1)$ (D) $(−2,−1)$

Consider an ideal gas confined in an isolated closed chamber. As the gas undergoes an adiabatic expansion the average time of collision between molecules increases as $V_{q}$, where V is the volume of the gas. The value of q is : $(γ=C_{v}C_{p} )$

The anode voltage of a photocell is kept fixed. The wavelength $λ$ of the light falling on the cathode is gradually changed. The plate current I of the photocell varies as follows:

Let $[ϵ_{0}]$ denote the dimensional formula of the permittivity of vacuum. If M = mass, L = length, T = time and A = electric current, then:

In which of the following pairs of molecules/ions, both the species are not likely to exist?

The graph between angle of deviation $(δ)$ and angle of incidence (i) for a triangular prism is represented by:

In the reaction : the product E is

If $(10)_{9}+2(11)_{1}(10)_{8}+3(11)_{2}(10)_{7}+¨+10(11)_{9}=k(10)_{9}$, then k is equal to