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

What is the hybridisation of carbon atom in diamond and graphite?

What is the action of dioxygen on Calcium

Resistance of conductivity cell filled with 0.1 M KCl solution is 100 ohms. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 ohms, calculate the conductivity and molar conductivity of 0.02 M KCl solution. [Given: Conductivity of 0.1 M KCl solution is 1.29 S m^-1 .]

What is the effect of temperature on solubility of a gas in a liquid?

State Kohlrausch’s law of independent migration of ions.

Which among the following reducing agents is NOT used to reduce acetaldehyde to ethyl alcohol?

(A) Na-Hg and water

(B) Zn-Hg and conc. HCl

(C) H2-Raney Ni

(D) LiAlH4/H+

Which among the following vitamins is also known as riboflavin?

(A) B1

(B) B2

(C) B6

(D) B12

How are the following compounds prepared?

Benzyl alcohol from benzyl chloride.

What are monosaccharides?

Draw ring structure of α - D - (+) - glucopyranose.

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.