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

Derive the relation between half life and rate constant for a first order reaction

How is ethyl amine prepared from methyl iodide?

Write the IUPAC name of [ Co(NO₂)₃(NH₃)₃ ].

How is carbolic acid prepared from the given compounds :

Aniline

The rate constant for a first order reaction is 100 s^–1. The time required for completion of 50% of reaction is _______.

(A) 0.0693 milliseconds

(B) 0.693 milliseconds

(C) 6.93 milliseconds

(D) 69.3 milliseconds

The relation a ≠ b ≠ c and α ≠  β ≠  γ represents which crystal system?

(A) Orthorhombic

(B) Tetragonal

(C) Triclinic

(D) Monoclinic

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?

Write the structure and IUPAC names of isomeric aldehydes having molecular formula C₅H₁₀O.

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