List of top Questions asked in Maharashtra Board Class XII Exam

What is osmotic pressure? How will you determine the molar mass of a solute from osmotic pressure?
Derive the relationship between molar mass, density of the substance, and unit cell edge length.
Define Lanthanide contraction. Write the balanced chemical equation when acidified \( K_2Cr_2O_7 \) reacts with \( H_2S \).

Write the structure and name of the monomer of Natural rubber

Write the structure and name of the monomer of Nylon-6.

Henry’s constant for CH\(_3\)Br(g) is 0.159 mol dm\(^{-3}\) bar\(^{-1}\) at 25\(^{\circ}\)C. Calculate its solubility in water at 25\(^{\circ}\)C if its partial pressure is 0.164 bar.
Write the preparation of (a) diethyl ether and (b) ethyl cyanide from ethyl bromide.
Explain the buffer action of the sodium acetate-acetic acid buffer.
Why are amines basic in nature? Among dimethylamine (pK$_b$ = 3.27) and diethylamine (pK$_b$ = 3.0), which one is more basic?

Calculate the time required to deposit 2.4 g of Cu, when 2.03 A of current is passed through \( \text{CuSO}_4 \) solution. 
(At. mass of Cu = 63.5 g mol\(^{-1}\))

Write the classification of proteins with an example.
What is a nanomaterial? Write the reaction involved in the sol-gel process during hydrolysis.
What are interhalogen compounds? Write the chemical reaction when chlorine reacts with dry slaked lime.
Derive an expression for maximum work obtainable during isothermal reversible expansion of an ideal gas from initial volume \( V_1 \) to final volume \( V_2 \).
Write the condition of reverse osmosis.
Write the SI unit of molar conductivity.

The compounds of \( \text{Ti}^{4+} \) ions are colourless due to ___________.

Calculate the effective atomic number (EAN) of \( [Co(NH_3)_6]^{3+} \) ion.
Complete the reaction: \[ CH_3CH_2Cl \quad \xrightarrow{\text{AgCN, alc., } \Delta} \quad ? \]
Write the name of the reduction product formed when ethyl cyanide is treated with sodium and alcohol.

Write the name of the metal nanoparticle used to remove E. coli bacteria from water.

If the unit of the rate constant is \( \text{mol} \, (\text{dm}^{-3} \text{s}^{-1}) \), the order of the reaction would be ____________.

The product of hydrolysis of propyne in the presence of 1% \( HgSO_4 \) and 40% \( H_2SO_4 \) is ___________.

Among the following, the vinylic halide is ____________.

The monomer used in the preparation of Teflon is ____________.