HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Important Questions for Chemistry

Write the mathematical equation of the first law of thermodynamics for an isochoric process.

Define buffer solution.

Write the mathematical equation of the first law of thermodynamics for an isochoric process.

Define the Standard enthalpy of combustion.

Three moles of an ideal gas are expanded isothermally from 15 dm³ to 20 dm³ at a constant external pressure of 1.2 bar. Calculate the amount of work in Joules.

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

How is the rate of reaction affected if the concentration of B is doubled?

For a reaction A + B ⟶ P, the rate is given by

Rate = k [A] [B]²

What is the overall order of reaction if A is present in large excess?

Explain pseudo-first-order reaction with an example.

Describe the manufacturing of H₂SO₄ by the contact process.

Elements of group 16 have lower ionization enthalpy values compared to those of group 15 elements. Explain why?

[NiCl₄]²⁻ is paramagnetic, while [Ni(CO)₄] is diamagnetic, though both are tetrahedral. Why? (Atomic number of Ni = 28)

Define racemic mixture.

How is phenol converted into the following?

Benzene

How is phenol converted into the following?

Benzene

How is phenol converted into the following?

Benzene

How is phenol converted into the following?

Benzene

Write the reactions involved in the preparation of Teflon.

Write the reactions involved in the preparation of Teflon.

What is ferromagnetism?

An element crystallizes in a f.c.c. lattice with a cell edge of 250 pm. Calculate the density if 300 g of this element contains 2 × 10²⁴ atoms.