Class 12th

In the presence of sunlight, benzene reacts with Cl₂ to give product, X. The number of hydrogens in X is_______________.

The difference between spin only magnetic moment value of $\left[Co{\left(H_{2}O\right)}_{6}C{l}_{2}andCr{\left(H_{2}O\right)}_6\right]C{l}_3$  is _______________.

A block of metal weighing 2kg is resting on a frictionless plane (as shown in figure). It is struck by a jet relasing water at a rate of 1 kgs^-1 and at a speed of 10 ms^-1. Then, the initial acceleration of the block, in ms^-2, will be:

The difference between spin only magnetic moment value of $\left[Co{\left(H_{2}O\right)}_{6}C{l}_{2}andCr{\left(H_{2}O\right)}_6\right]C{l}_3$  is _______________.

Let A = $\left|\begin{array}{ccc}\hfill 1\hfill & \hfill 1\hfill & \hfill 1\hfill \end{array}\right|$ and B = $\begin{array}{ccc}\hfill 9^2\hfill & \hfill -10^2\hfill & \hfill 11^2\hfill \\ \hfill 12^2\hfill & \hfill 13^2\hfill & \hfill -14^2\hfill \\ \hfill -15^2\hfill & \hfill 16^2\hfill & \hfill 17^2\hfill \end{array}$ , then the value of A'BA is:

For a reaction A--> 2B + C the half lives are 100s and 50s when the concentration of reactant A is 0.5 and 1.0 mol L^-1 respectively. The order of the reaction is _____________. (Nearest (Integer)

The amount of charge in F (Faraday) required to obtain one mole of iron from Fe₃O₄ is __________. (Nearest Integer)

If z = x + iy satisfies $\left|z\right|-2=0and\left|z-i\right|-\left|z+5i\right|=0,then$

At 298 K, the equilibrium constant is 2 * 10¹⁵ for the reaction:

Cu(s) + 2Ag⁺(aq)   $\rightleftharpoons$ Cu²⁺(aq) + 2Ag(s)

The equilibrium constant for the reaction

$\frac{1}{2}C{u}^{2+}\left(ag\right)$ + Ag(s)    + Ag⁺ (aq)

is x * 10^-8. The value of x is _____________. (Nearest Integer)

When 800mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5g of nitric acid is evaporated. The molarity of the remaining nitric acid solution is x * 10^-2M. (Nearest Integer)

(Molar mas of nitric acid is 63g mol^-1)