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

For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.

 A first order reaction takes 40 minutes for 30% decomposition. Calculate t_1/2 for this reaction. (Given log 1.428 = 0.1548)

State Kohlrausch Law.

What is the action of Excess of air on ammonia ?

which of the following carbocations is least stable?

(A) 

(B)

(C)

(D)

Inflammation of the tongue is due to the deficiency of:

Identify the compound 'B' in the following series of reaction:

(A) n-propyl chloride

(B) Propanamine

(C) n-propyl alcohol

(D) Isoproply alcohol

Which of the following reagents is best for the following conversion?

(A) LiAlH₄

(B) 

(C) H₂/Ni, 453 K

(D) Zn-Hg+HCl_(con)

How is ethanol prepared from methanal by using Grignard reagent?

Write the chemical reaction to prepare novolac polymer.

Explain the following term: Homopolymers

Write a short note on Hoffmann bromamide degradation.

What is the action of the following reagents on ammonia : 
Nessler's reagent

Explain, why do aquatic animals prefer to stay at lower level of water during summer?

Write the molecular formula and structural formula of BHA and BHT.

Identify the compounds 'A' and 'B' in the following equation:

How is Methoxyethane prepared from : Methyl iodide

IUPAC name of K₄[Fe(CN)₆] is

Carbon atom in methyl carbocation contains how many pairs of electrons?

(a) 8

(b) 4

(c) 3

(d) 5

Bakelite is the polymer of:

(a) Benzaldchyde and phenol

(b) Acetaldehyde and phenol

(c) Formaldehyde and phenol

(d) Formaldehyde and benzyl alcohol