HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

At same temperature, which pair of the following solutions are isotonic?

The empirical formula of a nonelectrolyte(X) is CH2 O. A solution containing six gram of X exerts the same osmotic pressure as that of 0.025M glucose solution at the same temperature. The molecular formula of X is

For a solution, the plot of osmotic pressure (π) versus the concentration (c in mol L^-1) gives a straight line with slope 310 R where ‘R’ is the gas constant. The temperature at which osmotic pressure measured is ______.

200 ml of an aqueous solution of a protein contains 1.26 g of protein. At 300 K, the osmotic pressure of this solution is found to be 2.52 × 10^-3 bar. The molar mass of protein will be (R = 0.083 L bar mol^-1 K^-1)

Write down the Born-Haber cycle for the formation of CaCl₂

What is osmosis?

A 0.25 M glucose solution, at 370.28 K has approximately the pressure as blood does what is the osmotic pressure of blood?

Calculate the molality of a solution containing 7.5 g glycine(NH₂-CH₂-COOH) dissolved in 500g of water.

Suggest and explain an indirect method to calculate lattice enthalpy of sodium chloride crystal.

Calculate the lattice energy of CaCl₂ from the given data

\[\ce{Ca_{(s)} + Cl2_{(g)} -> CaCl2_{(s)}}\] ∆`"H"_"f"^0` = − 795 kJ mol⁻¹

Sublimation: \[\ce{Ca_{(s)} -> Ca-{(g)}}\] ∆`"H"_1^0` = + 121 kJ mol⁻¹

Ionisation: \[\ce{Ca_{(g)} -> Ca^2+_{(g)} + 2e^-}\] ∆`"H"_2^0` = + 2422 kJ mol⁻¹

Dissociation: \[\ce{Cl2_{(g)} -> 2Cl_{(g)}}\] ∆`"H"_3^0` = + 242.8 kJ mol⁻¹

Electron affinity: \[\ce{Cl_{(g)} + e^- -> Cl^-_{(g)}}\] ∆`"H"_4^0` = −355 kJ mol⁻¹

Which of the following is natural and human disturbance in ecology?

What is green chemistry?

What are the various methods you suggest to protect our environment from pollution?

Give Kelvin a statement of the second law of thermodynamics.

Assertion: Oxygen molecule is paramagnetic.

Reason: It has two unpaired electron in its bonding molecular orbital.

Pick out the incorrect statement from the following:

Of the following molecules, which have shape similar to carbon dioxide?

CaO and NaCl have the same crystal structure and approximately the same radii. If U is the lattice energy of NaCl, the approximate lattice energy of CaO is ______.

Draw the M.O diagram for oxygen molecule calculate its bond order and show that O₂ is paramagnetic.

Draw MO diagram of CO and calculate its bond order.