List of top Chemistry Questions asked in UP Board XII

Write the IUPAC name of Acetaldehyde. Write its chemical equations with (i) NaHSO$_3$
(ii) NaOH
(iii) NH$_2$OH
(iv) CH$_3$OH in the presence of HCl gas.
Write short notes on the following:
i) Carbylamine reaction
ii) Hofmann's bromamide reaction
iii) Acetylation
Describe the laboratory method to prepare aniline and write the related chemical equation. Write also the equations of its two chemical properties and uses.
Write the structural formula of benzaldehyde. Write chemical equations of the reactions of benzaldehyde with (i) NH$_2$NH$_2$
(ii) Tollen's reagent
(iii) HNO$_3$ and H$_2$SO$_4$
(iv) NaOH.
Prove that the time taken to complete 99.9% reaction is ten times the half-life period $(t_{1/2})$ for a first-order reaction.
Write down the method of preparation of phenol. Write chemical equations of the reaction of phenol with the following: (i) Conc. HNO$_3$ (ii) Bromine water (iii) Zinc
Write chemical equation for the formation of chlorobenzene by Sandmeyer reaction. How can the following compounds be obtained from chlorobenzene? Clarify giving chemical equations.
(i) Phenol
(ii) Toluene
(iii) Diphenyl
Which elements are called transition elements? Explain: (i) Transition metals generally form coloured compounds, (ii) Transition metals or ions and many of their compounds show paramagnetic behaviour.
Write chemical equations of two methods of preparation of glucose. How will you obtain saccharic acid and gluconic acid from glucose?
What is electrode potential? Give the factors which affect the electrode potential of a metal.
Write the chemical equation for the preparation of anisole. Write the chemical equations of its reactions with:
i) Acetyl chloride
ii) Hydrogen iodide
iii) Mixture of conc.\ H$_2$SO$_4$ and conc.\ HNO$_3$
Write the IUPAC names of the following coordinate compounds:
(i) [CrCl$_2$(en)]Cl
(ii) Cs[FeCl$_4$]
(iii) K$_3$[Co(C$_2$O$_4$)$_3$]
(iv) [CoCl$_3$(NH$_3$)$_3$]
Write the structures of all possible isomers of alcohol having molecular formula C$_4$H$_{10$O.}
Explain order and molecularity of a reaction giving example.
Write the application of Grignard reagent.
Find the emf of the cell reaction: \(\mathrm{Zn(s)+2Ag^+(aq)\rightarrow Zn^{2+}(aq)+2Ag(s)}\).
\(\,E^\circ_{\mathrm{Zn^{2+}/Zn}}=-0.76\,\text{V}, E^\circ_{\mathrm{Ag^+/Ag}}=+0.80\,\text{V}\).
A solution of urea is 6% by mass. Calculate the mole fractions of urea and water in the solution. (Molecular mass of urea = 60).
Explain Clemmensen reduction giving example.
Find the osmotic pressure of $\dfrac{M{10}$ urea solution at $27^\circ\mathrm{C}$ \ (Given: $R=0.0821$ L\,atm\,K$^{-1}$\,mol$^{-1}$).}
What is Tollen's reagent? Write the chemical equation of its reaction with glucose.
Explain unidentate and bidentate ligands giving examples.
In solution Cu$^+$ ions are colourless while Cu$^{2+$ ions are coloured. Why?}
Define Raoult's Law and explain it.
Product obtained by hydrolysis of inulin is –
Acetic acid reacts with hydrazoic acid in the presence of conc. H$_2$SO$_4$ at 0$^\circ$C to form –