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

What is the action of bromine water on carbolic acid?

The major binding force in diamond is_______________ .

(a) Covalent bond                                                  

(b)  Ionic bond

(c) Metallic bond                                                   

(d)  Co-ordinate covalent bond

The molar conductivity of cation and anion of salt BA are 180 and 220 mhos respectively. The molar conductivity of salt BA at infinite dilution is_____________ .

(a) 90 mhos.cm²                                                                             

(b) 110 mhos.cm².mol^-1

(c) 200 mhos.cm².mol^-1                                                                 

(d) 400 mhos.cm².mol^-1

Sucrose decomposes in acid solution to give glucose and fructose according to the first order rate law. The half life of the reaction is 3 hours. Calculate fraction of sucrose which will remain after 8 hours.

Describe the laboratory method of preparation of ammonia

How are propan-1-amine and propan-2-amine prepared from oxime?

Write any ‘two’ uses of terylene.

Write the reactions involved in the preparation of  PVC

What is the covalency of nitrogen in N₂O₅?

The conductivity of 0.20 M solution of KCl at 298 K is 0.025 S cm⁻¹. Calculate its molar conductivity.

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.