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

Draw labelled diagram of H\(_2\) – O\(_2\) fuel cell. Write two applications of fuel cell.
Explain Aldol condensation of ethanal.
What are interstitial compounds? Give the classification of alloys with examples.
What is Pseudo first order reaction? Derive integrated rate law equation for zero order reaction.
Show that, time required for 99.9 percent completion of a first order reaction is three times the time required for 90 percent completion. Give electronic configuration of Gd (Z = 64). Write the name of nano structured material used in car tyres to increase the life of tyres.
Write chemical reactions for the following conversions:
i. Acetic acid into acetic anhydride
ii. Acetic acid into ethyl alcohol
Write IUPAC name and structure of methylphenylamine.
Explain anomalous behaviour of oxygen in group 16 with respect to:
i. Atomicity
ii. Magnetic property
iii. Oxidation state
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.
A weak monobasic acid is 10 percent dissociated in 0.05 M solution. What is percent dissociation in 0.15 M solution?
Define Osmosis. How will you determine molar mass of non-volatile solute by elevation of boiling point?
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 (\( R = 8.314 \, \text{J K}^{-1} \text{mol}^{-1} \)).
Write the reactions for the formation of nylon 6,6 polymer.
Explain dehydrohalogenation reaction of 2-chlorobutane. Write use and environmental effect of CFC.
Draw structures of the following compounds:
i. Chloric acid
ii. Peroxydisulphuric acid
Define: Acidic buffer solution. Write the relationship between solubility and solubility product for PbI\(_2\).
Define: Green chemistry. Write two advantages of nanoparticle and nanotechnology.
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
Write chemical reaction for the preparation of glucose from sucrose. Write structure of D-ribose.
Explain the following terms:
i. Substitutional impurity defect
ii. Interstitial impurity defect
What is the action of the following reagents on ethyl amine:
i. Chloroform and caustic potash
ii. Nitrous acid
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.
Write the chemical composition of cryolite.
Calculate 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 name of the technique used to know geometry of nanoparticles.