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

Write chemical equations indicating the action of following on bromobenzene.

fuming H₂SO₄

Write chemical equations indicating the action of following on bromobenzene.

conc. HNO₃/conc. H₂SO₄

An organic compound A with molecular formula C₄H₁₀O on treatment with phosphorus pentachloride gives alkyl chloride. Alkyl chloride on treatment with Mg in presence of dry ether gives a highly reactive compound B.
Compound B reacts with water to give hydrocarbon C. Alkyl chloride on treatment with Na in dry ether as a solvent gives alkane, 2,2,3,3-tetramethylbutane. Identify ‘A’, ‘B’, ‘C’

Give the classification of stoichiometric point defects.

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.