class 12

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The color of $KMnO_{4}$ is due to :

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Arrange the following compounds in order of decreasing acidity:

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

What is the minimum energy required to launch a satellite of mass m from the surface of a planet of mass M and radius R in a circular orbit at an altitude of 2R?

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 ?

Which one of the following molecules is expected to exhibit diamagnetic behaviour?

The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:

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:

The image of the line $3x−1 =1y−3 =−5z−4 $in the plane $2x−y+z+3=0$is the line