HSC Science (General) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions for Chemistry

Write the chemical equations involved in van Arkel method for refining zirconium metal.

Propene on oxidation with diborane in presence of alkaline hydrogen peroxide gives

(a) propane-1- ol

(b) propane-2-ol

(c) allyl alcohol

(d) propane-1, 2-diol

Identify 'A' and 'B' in the following reaction and rewrite the complete reaction :

What is Nessler’s reagent?

Write chemical reaction to prepare the Dextron polymer:
Dextron

Distinguish between crystalline solids and amorsphous solids.

What is Grignard reagent?

The half life period of a first order reaction is 6. 0 h . Calculate the rate constant

Classify the following molecular solids into different types: 

1. HCl
2. CO₂
3. Solid ice
4. SO₂

The molar conductivity of 0.05 M BaCl₂ solution at 25° C is 223Ω^-1 cm² mol^-1. What is its conductivity?

Define Anisotropy.

In a first-order reaction A → product, 80% of the given sample of compound decomposes in 40 min. What is the half-life period of the reaction? 

The S.I. unit of cell constant for conductivity cell is __________.

Write a preparation of phenol from cumene? What happens when phenol is heated with zinc dust? 

Draw the structures of veronal and thymine. 

Identify A and B respectively in the following reaction:
\[\ce{tert-butyl alcohol ->[20‰H2SO4][363K] A + H2O ->[HBr][H2O2] B}\]

How are the crystalline solids classified?

Answer the following in one or two sentences.

A solid is hard, brittle and electrically nonconductor. Its melt conducts electricity. What type of solid is it?

Answer the following in brief.

Distinguish between ionic solids and molecular solids

Choose the most correct answer :

The conjugate base of [Zn(H₂O)₄]^2⊕ is __________.