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Which of the following reactions is an example of a redox reaction?

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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?

The following reaction is performed at 298 K. $2NO(g)+O_{2}(g)⇔2NO_{2}(g)$ The standard free energy of formation of $NO(g)$ is 86.6 kJ/mol at 298 K. What is the standard free energy of formation of $NO_{2}(g)$ at 298 K ? $(K_{P}=1.6×10_{12})$

When 5V potential difference is applied across a wire of length 0.1 m, the drift speed of electrons is $2.5×10_{−4}ms_{−1}$. If the electron density in the wire is $8×10_{28}m_{−3}$, the resistivity of the material is close to :

$(lim)_{x→0}x_{2}sin(πcos_{2}x) $ is equal to

For gaseous state, if most probable speed is denoated by $C_{∗},$ average speed by C and mean square speed by $C,$ then for a large number of molecules the ratios of these speeds are:

A solid body of constant heat capacity $J/_{∘}C$ is being heated by keeping it in contact with reservoirs in two ways : (i) Sequentially keeping in contact with 2 reservoirs such that each reservoir supplies same amount of heat. (ii) Sequentially keeping in contact 8 reservoirs such that each reservoir supplies same amount of heat. In both the cases body is brought from initial temperature $100_{∘}C$ to final temperature $200_{∘}C$. Entropy change of the body in the two cases respectively is :

All the students of a class performed poorly in Mathematics. The teacher decided to give grace marks of 10 to each of the students. Which of the following statistical measures will not change even after the grace marks were given ?

An unknown alcohol is treated with the ''Lucas reagent'' to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism: