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

Explain Sidgwick’s electronic theory with suitable example

Write ‘four’ characteristics of co-ordinate complex ion.

Write ‘four’ physical methods of preserving food materials

Draw structure of Chlorine pentafluoride

a. Explain the trends in the following properties with reference to group 16:

1 Atomic radii and ionic radii

2 Density

3 ionisation enthalpy

4 Electronegativity

b. In the electolysis of AgNO₃ solution 0.7g of Ag is deposited after a certain period of time. Calulate the quantity of electricity required in coulomb. (Molar mass of Ag is 107.9g mol^-1)

Derive a relation between ΔH and ΔU for a chemical reaction. Draw neat labelled diagram of calomel electrode. Resistance and conductivity of a cell containing 0.001 M KCI solution at 298K are 1500Ω and 1.46x10^-4 S.cm^-1 respectively.

The rate of reaction for certain reaction is expressed as:

`1/3(d[A])/dt=-1/2(d[B])/dt=-(d[C])/dt`

 The reaction is ______.

What happens if external potential applied becomes greater than E°cell of electrochemical cell?

Write two differences between an ideal solution and a non-ideal solution.

test q 1234

Answer the following.

List the uses of Neon and argon gases.

Explain magnetic separation process of ores with the help of a neat, labelled diagram.

How is diethyl ether prepared by continuous etherification process?

Write the molecular and structural formula of BHA and BHT.

Define carbolic acid.

How carbolic acid is prepared from benzene sulphonic acid ?

Calcium carbonate used in the extraction of iron acts as _______.

(A) oxidising agent

(B) reducing agent

(C) gangue

(D) flux

Construct a labelled diagram for the following cell:

`Zn|Zn^(2+)(1M)||H^+(1M)|H_(2(g,1atm))|Pt`

In the following 

The compound ‘B’ is _______.
(A) Propan–1–amine

(B) Propan–2–amine

(C) Isopropylamine

(D) Dimethylamine

How ligands are classified? Explain with suitable examples.