List of top Questions asked in UP Board XII

Write resonating structures of arylamines. Explain why arylamines exhibit basic properties. Write chemical equations of the reaction of preparation of amine from nitro and nitrile compounds.
Differentiate between elimination and substitution reactions in haloalkanes by an example.
Explain first-order reaction. The value of velocity (rate) constant \( k \) for a first-order reaction is \( 5 \times 10^{-14} \, \text{s}^{-1} \). Calculate the half-life period of the reaction.
Write chemical equations of the following reactions:
Write a short note on RNA.
Explain the mechanism of electrophilic substitution in haloarenes with the help of an example.
Explain Valence Bond Theory (VBT) in coordination compounds.
Write structural formula of primary, secondary, and tertiary benzylic alcohol.
Explain velocity (rate) constant of a reaction.
The boiling point of alcohols increases with the increase in the number of carbon atoms but decreases on branching. Why?
Explain co-ordination number by giving an example.
Why does the +3 and +4 oxidation state of Cerium (Ce) remain stable?
Is oxidation of bromide ion into bromine by ferric ion possible?
Four alternatives are given in each part of this question. Choose the correct alternative and write it in your answer-book. Number of moles in 180 g of water is:
Write chemical equations for the reaction of (x) ethanamine with HCl and (y) aniline with \( NaNO_2 \) and dilute HCl at \( 0^\circ C \).
Write general electronic configuration of d-block and f-block elements.
State the difference between molecularity of a reaction and order of a reaction. Write the velocity equation for the reaction \( H_2(g) + Cl_2(g) \rightarrow 2HCl(g) \), which is a zero-order reaction.
State the role of hormones in our body.
Write a short note on Rosenmund reduction. Write only the chemical equation of the reaction of ethyne with water in presence of \( H_2SO_4 \) and \( HgSO_4 \).
State important applications of phenol.
What are amines? Write one differentiating test for primary, secondary, and tertiary amines.
Define specific resistance and conductance of a cell.
46 g ethanol is dissolved in 54 g water. Calculate mole fraction of ethanol and water.
Calculate the normality of a solution prepared by dissolving 325 g of anhydrous sodium carbonate (\( Na_2CO_3 \)) in 250 mL of water. Equivalent weight of \( Na_2CO_3 \) is 5
Write the difference between Galvanic cell and Electrolytic cell.