List of top Questions asked in UP Board XII

Describe the mechanism of bimolecular nucleophilic substitution reactions (\( S_N2 \)) in haloalkanes.
What is osmotic pressure? Explain the difference between osmosis and diffusion with an example.
Explain the acidic nature of phenol.
Discuss the method of preparation of potassium dichromate from chromite ore and write the structural formula of dichromate ion.
2.82 g of glucose (molar mass = 180 g mol\(^{-1}\)) is dissolved in 30 g of water. Calculate the molality of the solution.
In which of the following compounds, oxidation number of Mn is +6?
Which of the following gives isocyanide test?
In nucleic acids, the nucleotides are linked together by
Which of the following ligands can act as an ambidentate ligand?
The colligative property is
Effect of temperature on rate of reaction and calculation of time for 80\% completion.
Explain the mechanism of dehydration of ethanol.
Explain the difference between aldehydes and ketones by Fehling solution and Schiff reagent.
Explain ionisation isomerism and linkage isomerism in coordination compounds with example.
After eliminating salt bridge of any Galvanic cell, voltage of the cell:
Four alternatives are given in each part of this question. Write the correct alternative in your answer-book. Fe is:
Write the chemical equations for the preparation of 1-iodobutane from the following: 1-butanol
Calculate the e.m.f. of the following cell writing the cell reaction: \[ \text{Cu} | \text{Cu}^{2+}(1M) || \text{Ag}^+(1M) | \text{Ag} \] Given: \[ E^0_{\text{Cu}^{2+}/\text{Cu}} = +0.34 \text{ volt}, \quad E^0_{\text{Ag}^+/\text{Ag}} = +0.80 \text{ volt} \]
How does the acidified \( KMnO_4 \) solution react with ferrous sulphate, \( SO_2 \), oxalic acid, and sodium thiosulphate?
The velocity of a gaseous reaction is halved, whereas the volume of the pot is doubled. Calculate the order of reaction.
For a first-order reaction, prove that the time taken in completion of 3/4 part of the reaction is two times that of its half-life period.
Write the units of velocity and velocity constant for zero order reaction.
Write I.U.P.A.C. names of the following compounds: \( CH_3CH(CH_3)CH_2CH_2CH_2CHO \)
Explain the importance of complex compounds in qualitative analysis with a suitable example.
At 298 K conductivity of 0.20 M KCl solution is 0.0248 S cm\(^{-1}\). Calculate its molar conductivity.