Chemistry NCERT Exemplar Solutions Class 12th Chapter One

A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is

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 _______________.

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 _______________.

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)

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)

2.4g coal is burnt in a bomb calorimeter in excess of oxygen at 298 K and 1 atm pressure. The temperature of the calorimeter rises from 298 K to 300 K. The enthalpy change during the combustion of coal is -x kJ mol^-1. The value of x is ____________.

(Given : Heat capacity of bomb calorimeter 20.0 kJ K^-1. Assume coal to be pure carbon)

The wavelength of an electron and a neutron will become equal when the velocity of the electron is x times the velocity of neutron. The value of x is ___________. (Nearest Integer)

(Mass of electron is 9.1 * 10^-31kg and mass of neutron is 1.6 * 10^-27kg)