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The correct statement about the synthesis of erythritol $(C(CH_{2}OH)_{4})$ used in the preparation if PETN is :

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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:

In the context of the Hall - Heroult process for the extraction of Al, which of the following statements is false ?

If the equations $x_{2}+2x+3=0$and $ax_{2}+bx+c=0,a,b,c∈R$, have a common root, then $a:b:c$is

The I - V characteristic of an LED is

The period of oscillation of a simple pendulum is $T=2πgL .$ Measured value of L is 20.0 cm known to 1 mm accuracy and time for 100 oscillations of the pendulum is found to be 90 s using wrist watch of 1 s resolution. The accuracy in the determination of g is :

Which of the following is the wrong statement?

The number of integers greater than $6,000$ that can be formed, using the digits $3,5,6,7and8,$ without repetition, is :

The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is :