HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Chemistry

Draw the structures of veronal and thymine. 

The ligand triethylenetetramine is _______.

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Calculate the number of atoms in fcc unit cell.

Obtain the relationship between the density of a substance and the edge length of the unit cell.

An element with molar mass 27 g/mol forms a cubic unit cell with edge length of 405 p.m. If the density of the element is 2.7 g/cm³, what is the nature of the cubic unit cell?

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The vapour pressure of a solution containing 2 moles of a solute in 2 moles of water (vapour pressure of pure water = 24 mm Hg) is ______.

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Vapour pressure of a solution is _______.

State Raoult’s law for the solutions of non-volatile solutes in volatile solvents.

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Using Raoult’s law, how will you show that ΔP = `"P"_1^0 "x"_2`? Where, x₂ is the mole fraction of solute in the solution and `"P"_1^0` vapour pressure of pure solvent.

Fish generally needs O₂ concentration in water at least 3.8 mg/L for survival. What partial pressure of O₂ above the water is needed for the survival of fish? Given the solubility of O₂ in water at 0 °C and 1 atm^-1 partial pressure is 2.2 × 10^-3 atm mol/L.

The vapour pressure of water at 20°C is 17 mm Hg. What is the vapour pressure of solution containing 2.8 g urea in 50 g of water?

A mixture of benzene and toluene contains 30% by mass of toluene. At 30 °C, vapour pressure of pure toluene is 36.7 mm Hg and that of pure benzene is 118.2 mm Hg. Assuming that the two liquids form ideal solutions, calculate the total pressure and partial pressure of each constituent above the solution at 30 °C.

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Derive the expression for the maximum work.

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Calculate the maximum work when 24 g of O₂ are expanded isothermally and reversibly from the pressure of 1.6 bar to 1 bar at 298 K.

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Write the electrode reactions during electrolysis of molten KCl.

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How many electrons would have a total charge of 1 coulomb?

Write electrode reactions for the electrolysis of aqueous NaCl.

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How many moles of electrons are passed when 0.8-ampere current is passed for 1 hour through molten CaCl₂?

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Explain electrolysis of molten NaCl.

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What current strength in amperes will be required to produce 2.4 g of Cu from CuSO₄ solution in 1 hour? Molar mass of Cu = 63.5 g mol^–1.