Ncert Solutions Chemistry Class 11th

Identify the incorrect statement from the following.

‘x’ g of molecular oxygen(O₂) is mixed with 200g of neon (Ne). The total pressure of the non-reactive mixture of O₂ and Ne in the cylinder is 25 bar. The partial pressure of Ne is 20 bar at the same temperature and volume. The value of ‘x’ is_________.

A gas (Molar mass = 280 g mol^-1) was burnt in excess O₂ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from 298.0 K to 298.45K. If the heat capacity of calorimeter is 2.5 kJ K^-1 and enthalpy of combustion of gas is 9 kJ mol^-1 the amount of gas burnt is _____________g. (Nearest Integer)

For a real at 25°C temperature and high pressure (99 bar) the value of compressibility factor is 2, so the value of Vander Waal’s constant ‘b’ should be__________× 10^-2 L mol^-1. (Nearest Integer)       

(Given R = 0.083 L bar K^-1 mol^-1)

The molar heat capacity for an ideal gas at constant pressure is 20.785JK^-1 mol^-1. The change in internal energy is 5000 J upon heating it from 300 K to 500 K. The number of moles of the gas at constant volume is __________. (Nearest Integer)

Amongst the following, the number of oxide(s) which are paramagnetic in nature is Na₂O, KO₂, NO₂, N₂O, ClO₂, NO, SO₂, Cl₂O (Nearest Integer)

While performing a thermodynamics experiment, a student made the following observation.

HCl + NaOH → NaCl + H₂O $\Delta H$ <!-- [if gte mso 9]><xml> </xml><![endif]--> = -57.3 kJ mol^?1

CH₃COOH + NaOH → CH₃COONa + H₂O $\Delta H$ <!-- [if gte mso 9]><xml> </xml><![endif]--> = -55.3 kJ mol^-1

The enthalpy of ionization of CH₃COOH as calculated by the student is _________kJ mol^-1. (nearest integer)

A sealed flask with a capacity of 2 dm³ contains 11g of propane gas. The flask is so weak that it will burst if the pressure becomes 2 MPa. The minimum temperature at which the flask will burst is _________ $°C$ <!-- [if gte mso 9]><xml> </xml><![endif]-->. [Nearest integer]

(Given: R = 8.3 JK^-1 mol^-1. Atomic masses of C and H are 12u and 1u, respectively)

(Assume that propane behaves as an ideal gas.)

The number of sp³hybridised carbons in an acyclic neutral compound with molecular formula C₄H₅N is __________.

While estimating the nitrogen present in an organic compound by Kjeldahl’s method, the ammonia evolved from 0.25 g of the compound neutralized 2.5 mL of M H₂SO₄. The percentage of nitrogen present in organic compound is _________.