HSC Science (General) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

What is a substitutional impurity defect?

Explain solid solutions of metals and vacancy through aliovalent cations.

Write the equations for the preparation of ethyl chloride using

1. Hydrogen halide
2. ethene
3. Thionyl chloride

Which of these methods is preferred and why?

Which of the following statements is applicable for 0.1 M urea solution and 0.1 M sucrose solution?

What are hypertonic solutions?

When 50 g of a nonvolatile solute is dissolved in a certain quantity of solvent, the elevation of boiling point is 2.0 K. What will be the elevation of a boiling point when 30 g of solute is dissolved in the same amount of the same solvent?

Derive the expression for molar mass of solute in terms of boiling point elevation of solvent.

Explain the osmotic pressure of a solution with the help of a thistle tube.

Explain the phenomenon of osmosis.

A solution containing 3 g of solute A (M = 60 g/mol) in 1 L solution is isotonic with a solution containing 8.55 g of solute B in 500 mL solution. What is the molar mass of B?

In biochemical system, pH of blood in our body is maintained due to the following buffer:

The pK_b of weak base BOH [K_b(BOH) = 1 × 10^-5] will be ______.

Name the buffer which is used to maintained pH of 8 to 10 for precipitation of cations III A group in qualitative analysis.

Write the formula to calculate pH of buffer solution.

Define Osmosis.

Define buffer solution.

Explain the types of buffer solutions.

Write one application of the following buffer:

Citrate buffer

Write one application of the following buffer:

`"HCO"_3^-  + "H"_2"CO"_3`

Write one application of the following buffer:

NH₄OH + NH₄Cl