List of top Chemistry Questions asked in Maharashtra Board Class XII Exam

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.

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\(^{-1}\))

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.

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 ____________.

The number of particles present in a Face-Centered Cubic (FCC) unit cell is/are ____________.

The correct structure of the complex having IUPAC name sodium hexanitrocobaltate(III) is:
The product of the following reaction is: \[ C_2H_5 - \overset{O}{\overset{||}{C}} - CH_3 \quad \xrightarrow{H_2/Ni, \ \Delta} \quad ? \]

The linkage present in Lactose is ___________.

Write the sign convention of work done during the expansion of gas.
Write the chemical reactions for the following:
i. Chlorobenzene is heated with fuming H\(_2\)SO\(_4\)
ii. Ethyl bromide is heated with silver acetate
Explain dehydrohalogenation reaction of 2-chlorobutane. Write use and environmental effect of CFC.
What are interstitial compounds? Give the classification of alloys with examples.
Calculate standard Gibbs energy change at 25°C for the cell reaction \( \text{Cd(s)} + \text{Sn}^{2+}(\text{aq}) \to \text{Cd}^{2+}(\text{aq}) + \text{Sn(s)} \), \( E^\circ_{\text{Cd}} = -0.403 \, \text{V} \), \( E^\circ_{\text{Sn}} = -0.136 \, \text{V} \).

Convert the following: 
i. Ethyl alcohol into ethyl acetate 
ii. Phenol into benzene 
iii. Diethyl ether into ethyl chloride

Write Dow process for preparation of Phenol. 
What is the action of bromine water on phenol? 
Give reason: Group 16th elements have lower ionisation enthalpy compared to group 15th elements. 
Write two uses of dioxygen. 
 

Silver crystallizes in fcc structure. If edge length of unit cell is 400 pm, calculate density of silver (Atomic mass of Ag = 108). Write a note on Haloform reaction.