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

Write equation to convert Methyl cyanide to ethanoic acid.

Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.

Draw structure of SO₂.

What is the action of the following regent on propanal?

Sodium Bisulphite

How will you determine molar mass of solute from osmotic pressure?

Explain buffer action of sodium acetate-acetic acid buffer.

Write the condition of reverse osmosis.

Explain  Optical activity

Which of the following amines yields foul smelling product with holoform and alcoholic KOH?

(a)    Ethyl amine                   

(b)   Diethyl amine

(c)    Triethyi amine               

(d)  Ethyl methyl amine

Derive van’t Hoff general solution equation.

Explain the structure of sulphur dioxide.

The substance ‘X’, when dissolved in solvent water gave molar mass corresponding to the molecular formula ‘X3’. The van’t Hoff factor (i) is _______.

(A) 3

(B) 0.33

(C) 1.3

(D) 1

What is natural rubber?

(A) Cis-1,4-polyisoprene

(B) Neoprene

(C) Trans-1,4-polyisoprene

(D) Butyl rubber

What is the value of for the following reaction at 298 K -

6CO₂+ 6H₂0_(l) → C6H₁₂0_6(s) ⁺ 60_2(g),

Given that: ΔG° = 2879 kj mol^-1, AS = -210 JK^-1 mol^-1.

State and explain Hess’s law of constant heat summation.

With the help of the equation ΔG° = - nFE^o_cell. Explain that cell potential is an intensive property.

Define van’t Hoff factor.

A unit cell of iron crystal has edge length 288 pm and density 7.86 g.cm^-3. Find the number of atoms per unit cell and type of the crystal lattice.

Given : Molar mass of iron = 56 g.mol^-1; Avogadro's number N_A = 6.022 x 10²³.

Mohr’s Salt is -

(a) Ferrous ammonium sulphate

(b) Ferrous sulphate

(c) Ammonium sulphate

(d) Ferric sulphate

How many atoms constitute one unit cell of a face-centered cubic crystal?