List of top Chemistry Questions asked in UP Board XII

Is oxidation of bromide ion into bromine by ferric ion possible?
Why does the +3 and +4 oxidation state of Cerium (Ce) remain stable?
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.
Define specific resistance and conductance of a cell.
State important applications of phenol.
State the role of hormones in our body.
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.
What are amines? Write one differentiating test for primary, secondary, and tertiary amines.
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 \( HgSO_4 \).
Write ions produced in an aqueous solution of \( K_4[Fe(CN)_6] \). What is the oxidation number of \( Fe \) in this compound?
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
Explain the effect of temperature and concentration on the velocity of a reaction.
Write the difference between Galvanic cell and Electrolytic cell.
The true statement for the formula \( K = Ae^{-E_a / RT} \) is:
The configuration showing maximum oxidation state is:
Electrode potential of standard hydrogen electrode is:
The column of a solution of 0.05 mol L$^{-1}$ NaOH has diameter 2.0 cm and length 100 cm. The resistance of the column of solution is 5.55 $\times$ 10$^3$ ohm. Calculate its resistivity, conductivity and molar conductivity.

Explain with reasons: 
(i) Sulphuric acid is not used in the reaction of alcohol and KI. 
(ii) Haloalkanes form alkyl cyanide as chief product on reaction with KCN, while isocyanide as chief product on reaction with AgCN. 
(iii) Although chlorine is an electron withdrawing group, even then it is ortho- and para-directing in aromatic electrophilic substitution reactions.

Explain the following: 
(i) NCl\(_3\) occurs but NCl\(_5\) does not. Why? 
(ii) Why are halogens strong oxidising agents? 
 

Find the osmotic pressure of $\dfrac{M}{10}$ urea solution at 27$^\circ$C. (R = 0.0821 litre atm K$^{-1}$ mol$^{-1}$)
Write short notes on the following:
(i) Aldol condensation
(ii) Decarboxylation
(iii) Cannizzaro reaction

How will you obtain Benzoic Acid from the following?
 (i) Toluene 
(ii) Benzamide 
(iii) Ethyl benzoate