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

Write the formulae of the raw materials used for preparation of Dextran.

Write a note on Sandmeyer's reaction.

What is the action of benzene diazonium chloride on phenol in alkaline medium?

What is the action of benzene diazonium chloride on Aniline

Write the structure and IUPAC name of 'methyl-n-propyl ether'.

What is the action of hot HI on it?

Classify the following drugs into Analgesics and Antibiotics 

(1) Ofloxacin

(2) Morphine

(3) Ampicillin

(4) Chloramphenicol

Identify 'A' and 'B' and rewrite the reactions

Identify 'A' and 'B' and rewrite the reactions

Which mixture is used for respiration by deep sea divers?

(A) He + O₂

(B) Ne + O₂

(C) Ar + O₂

(D) Kr + O₂

Describe ‘froth floatation process’ for concentration of sulphide ore.

How does solubility of a gas in water varies with the temperature?

3-Methylbutane-2-ol on heating with HI gives ______

The Zieglar-Natta catalyst is used in the preparation of _______.

(A) LDPE

(B) PHBV

(C) PAN

(D) HDPE

How is phenol converted into the following?

Benzene

How is phenol converted into the following?

benzoquinone

How is phenol converted into the following?

picric acid

Explain the mechanism of action of hydroiodic acid on 3-methylbutan-2-ol.

Mention 'two' uses of propan-2-one.

Write the structure of melamine.