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

Write the reactions involved in extraction of silver from its ore by leaching process.

What is the action of the following reagents on phenol - Bromine in CS₂ at low temperature.

Write balanced chemical equations for action of ammonia on - formaldehyde

Derive the relationship between relative lowering of vapour pressure and molar mass of nonvolatile solute.

How are the following compounds prepared?

benzaldehyde from benzene

Discuss the optical activity of lactic acid.

For a chemical reaction, A→ products, the rate of reaction doubles when the concentration of
‘A’ is increased by a factor of 4, the order of reaction is

(A) 2

(B) 0.5

(C) 4

(D) 1

Which of the following is the first oxidation product of secondary alcohol?

(A) Alkene

(B) Aldehyde

(C) Ketone

(D) Carboxylic acid

Explain the mechanism of alkaline hydrolysis of tert-butyl bromide with energy profile diagram.

Mention the names of various steps involved in the extraction of pure metals from their ores.

The stability order for carbocation is _______.

(A) 2° > 3° > 1° 

(B) 3° > 2° > 1°

(C) 3° > 1° > 2°

(D) 1° > 3° > 2°

How are the following polymers prepared?

Orlon

The temperature at which vapour pressure of a liquid becomes equal to the atmospheric
pressure is _______.

(A) melting point

(B) boiling point

(C) 273 K

(D) 373 K

How is nitromethane prepared from the following?

α-halogen carboxylic acid

Write a note on aldol condensation.

What are thermoplastic polymers?

How are the following compounds prepared?

acetophenone from benzene

How are the following compounds prepared?

benzaldehyde from benzoyl chloride

What is the action of the following reagents on phenol - H₂SO₄ at room temperature.

Write balanced chemical equations for action of ammonia on - acetaldehyde