List of top Questions asked in UP Board XII

Calculate the osmotic pressure of 5% aqueous urea solution (w/v) at 27$^\circ$C. Molecular weight of urea = 60. (R = 0.0821 L atm K$^{-1}$ mol$^{-1}$)
State any four properties of d-block elements.
Phenol shows acidic character but ethanol remains approximately neutral. Why?
Unit of specific conductance is:
Non-electrolyte is:
Write the names of two lyophilic and two lyophobic colloids.
State Hardy–Schulze law.
State anti-osmosis with example.
State the name and formula of electrophile used in the nitration of benzaldehyde.
Name one disaccharide and write its molecular formula.
Differentiate between coordination compound and double salt.
Structure of the crystal of sodium chloride is:
The charge on colloidal particles of Fe\(_2\)O\(_3 \cdot xH_2O\) is:
Molecular formula of sulphur at ordinary temperature is:
Gas present in food packet of substances is:
Explain Werner’s postulates related to the bonding in coordination compounds.
Describe Ostwald’s process for the industrial manufacture of nitric acid. Write the balanced chemical equations of the following reactions: (i) Zinc metal reacts with conc. HNO$_3$
(ii) Iodine reacts with conc. HNO$_3$
Give reason that bleaching action of chlorine is permanent while that of SO$_2$ is temporary.
Explain why NH$_3$ is basic in nature.
What happens when Sulphur dioxide reacts with acidic potassium permanganate? Write balanced chemical equation for this reaction.
Write the mechanism of dehydration of ethanol.
Write short notes on the following: (A) Reimer–Tiemann Reaction
(B) Kolbe’s Reaction
(C) Williamson Ether Synthesis
Discuss the mechanism of unimolecular and bimolecular nucleophilic substitution reactions in haloalkanes.
Write a short note on Coagulation.
‘Action of soap is based on the emulsification and micelle formation.’ Comment on it.