class 12

Chemistry

Atomic Structure

The ionic radii (in Å) of $N_{3−},O_{2−}$ and $F_{−}$ are respectively :

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A ray of light along $x+3 y=3 $gets reflected upon reaching x-axis, the equation of the reflected rays is

A complex number z is said to be unimodular if . Suppose $z_{1}$and $z_{2}$are complex numbers such that $2−z_{1}z_{2}z_{1}−2z_{2} $is unimodular and $z_{2}$is not unimodular. Then the point $z_{1}$lies on a :

The order of stability of the following carbocations:

The standard Gibbs energy change at 300 K for the reaction $2A⇔B+C$ is $2494.2J.$ At a given time, the composition of the reaction mixture is $[A]=21 ,[B]=2and[C]=21 .$ The reaction proceeds in the : $[R=8.314J/K/mol,e=2.718]$

For a simle pendulum, a graph is plotted between its kinetic energy (KE) and potential energy (PE) against its displacement d. Which one of the following represents these correctly ? (Graphs are schematic and not drawn to scale)

If $[a×bb×cc×a]=λ[abc]_{2}$, then l is equal to

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

Four successive members of the first row transition elements are listed below with atomic numbers. Which one of them is expected to have the highest $E_{M_{3+}/M_{2+}}$ value ?