HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Chemistry

Calculate Δ_subH of the H₂O from the given data:
\[\ce{H2O_{(s)}->H2O_{(l)},}\] Δ_fusH = 6.01kJ mol⁻¹

\[\ce{H2O_{(l)}-> H2O_{(g)},}\] Δ_VapH = 45.07 kJ mol⁻¹.

Prove that: M₂ = `(W_2RT)/(πV)`.

Calculate heat evolved for combustion of 13 gm of acetylene (C₂H₂).

Given: \[\ce{C2H2_{(g)} + 5/2O_{2(g)}-> 2CO_{2(g)} + H2O_{(l)} \Delta_{(c)}H^{0} = - 1300 kJ}\]

Arrange the following solutions in the order of increasing osmotic pressure (π) assuming complete ionization.

1. 0.5M Li₂ SO₄
2. 0.5M KCl
3. 0.5M Al₂ (SO₄)₃ 
4. 0.1 M BaCl₂

Heat of combustion of CH_4(g) is -890 kJ/mole. What is the value of Δ_c H of 8gm of methane?

Define reverse osmosis.

Name the four colligative properties that are oftently used for determination of molecular mass.

Write a note on the aldol condensation reaction of acetaldehyde.

What is aldol condensation? Explain it with suitable examples.

Draw a neat labelled diagram of a lead accumulator.

Discuss the trends in electronegativity and atomic radii for elements of group 16 17, 18. 

How will you determine molar mass of solute from osmotic pressure?

Write the condition of reverse osmosis.

Write two uses of neon.

Write the net cell reaction during discharging of lead accumulator.

Calculate the standard enthalpy of combustion of methane if the standard enthalpy of formation of methane, carbon dioxide and water are −74.8, −393.5 and −285.8 kJmol⁻¹ respectively.

What is ferromagnetism?

Iron (z=26) is highly ferromagnetic. Explain.

The molecular formula H₂S₂O₂ represents which oxoacid?

• Hydrosulphurous acid
• Thiosulphurous acid
• Sulphuric acid
• Pyrosulphurous acid

Write the molecular formula and structure of dithionic acid.