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

How is 1-nitropropane prepared from suitable oxime?

How are  2 - nitropropane prepared from suitable oxime?

Write the reaction for the preparation of Nylon-6.

Write the reactions involved in dehydration of 1°, 2° and 3° alcohols.

How are 1 - nitropropane, 2-nitropropane and 2-methyl 2- nitropropane are distinguished from each other using nitrous acid?

Phenelzine is used as an

(a)  analgesic                      

(b) antiseptic

(c) antipyretic

(d) antidepressant

The integrated rate equation for first order reaction is A → products

Derive the relation between half life and rate constant for a first order reaction

1.0 x10^-3Kg of urea when dissolved in 0.0985 Kg of a solvent, decreases freezing point of the solvent by 0.211 k. 1.6x10 Kg of another non-electrolyte solute when dissolved in 0.086 Kg of the same solvent depresses the freezing point by 0.34 K. Calculate the molar mass of the another solute. (Given molar mass of urea = 60)

Write one statement of first law of thermodyamics and its mathematical expression.

Write one statement of first law of thermodyamics and its mathematical expression.

Identify the product ‘D’ in the following sequence of reactions:

\[\ce{H3C - CH2 - CH2 - Cl \underset{KOH}{\overset{Alc}{->}} 'B' \overset{HBr}{->} 'C' \underset{Elther}{\overset{Na}{->}}'D'}\]

Primary and secondary nitroalcanes containing α - H atom show property of -

1. chain isomerism
2. tautomerism
3. optical isomerism
4. geometrical isomerism

Write mechanism of Aldol addition reaction.

The hybridisation of phosphorus in phosphorus pentachloride is _______.

(A) dsp³

(B) sp³ d

(C) d² sp³

(D) sp³ d²

The rate constant for a first order reaction is 100 s^–1. The time required for completion of 50% of reaction is _______.

(A) 0.0693 milliseconds

(B) 0.693 milliseconds

(C) 6.93 milliseconds

(D) 69.3 milliseconds

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

Write chemical formula of the following oxoacids of chlorine:

a. Hypochlorous acid

b. Chlorous acid

c. Chloric acid

d. Perchloric acid

Identify ‘A’ and ‘B’ in the following reaction :

\[\ce{CH3 - CH = CH2 ->[HBr]'A' ->[alc.KOH]'B'}\]