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

Explain anomalous behaviour of oxygen in group 16 with respect to: i. Atomicity ii. Magnetic property iii. Oxidation state
Draw labelled diagram of H$_2$ - O$_2$ fuel cell. Write two applications of fuel cell.
What is Pseudo first order reaction? Derive integrated rate law equation for zero order reaction.
What are interstitial compounds? Give the classification of alloys with examples.
Explain the dehydrohalogenation reaction of 2-chlorobutane. Write use and environmental effect of CFC.
2000 mmol of an ideal gas expanded isothermally and reversibly from 20 L to 30 L at 300 K, calculate the work done in the process (R = 8.314 J K$^{-1}$ mol$^{-1}$).
A weak monobasic acid is 10\% dissociated in 0.05 M solution. What is the percent dissociation in 0.15 M solution?
Convert the following: i. Ethyl alcohol into ethyl acetate
ii. Phenol into benzene
iii. Diethyl ether into ethyl chloride
Define Osmosis. How will you determine the molar mass of a non-volatile solute by elevation of boiling point?
Write the reactions for the formation of nylon 6,6 polymer.
Write the chemical reaction for the preparation of glucose from sucrose. Write structure of D-ribose.
Define Extensive property. Calculate the work done during the expansion of 2 moles of an ideal gas from 10 dm^3 to 20 dm^3 at 298 K in vacuum.
Calculate standard Gibbs energy change at 25°C for the cell reaction \[ \text{Cd(s)} + \text{Sn}^{2+}_{(aq)} \rightleftharpoons \text{Cd}^{2+}_{(aq)} + \text{Sn(s)} \] Given: \[ E^\circ_{\text{cd}} = -0.403V, \quad E^\circ_{\text{sn}} = -0.136V \]
Define: Acidic buffer solution. Write the relationship between solubility and solubility product for PbI\(_2\).
Define Green chemistry. Write two advantages of nanoparticles and nanotechnology.
Calculate the mole fraction of solute, if the vapour pressure of pure benzene at certain temperature is 640 mmHg and vapour pressure of solution of a solute in benzene is 600 mmHg.
Distinguish between lanthanides and actinides.
Calculate the molar conductivity for 0.5 M BaCl_2 if its conductivity at 298K is 0.01 \( \Omega^{-1} \text{cm}^{-1} \).
Write the correct condition for spontaneity in terms of Gibbs energy.
Write the SI unit of cryoscopic constant.
Write the name of the platinum complex used in the treatment of cancer.
Write the chemical composition of cryolite.
Write the structure of the product formed when chlorobenzene is treated with sodium metal in the presence of dry ether.
The monomer of natural rubber is:
Write the name of the product formed by the action of \( \text{LiAlH}_4 \) ether on acetamide.