List of top Questions asked in UP Board XII

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.
What is electrode potential? Give the factors which affect the electrode potential of a metal.
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 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 chemical equations of two methods of preparation of glucose. How will you obtain saccharic acid and gluconic acid from glucose?
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
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 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 application of Grignard reagent.
Find the osmotic pressure of $\dfrac{M{10}$ urea solution at $27^\circ\mathrm{C}$ \ (Given: $R=0.0821$ L\,atm\,K$^{-1}$\,mol$^{-1}$).}
Write the structures of all possible isomers of alcohol having molecular formula C$_4$H$_{10$O.}
Explain Clemmensen reduction giving example.
What is Tollen's reagent? Write the chemical equation of its reaction with glucose.
A solution of urea is 6% by mass. Calculate the mole fractions of urea and water in the solution. (Molecular mass of urea = 60).
Find the emf of the cell reaction: \(\mathrm{Zn(s)+2Ag^+(aq)\rightarrow Zn^{2+}(aq)+2Ag(s)}\).
\(\,E^\circ_{\mathrm{Zn^{2+}/Zn}}=-0.76\,\text{V}, E^\circ_{\mathrm{Ag^+/Ag}}=+0.80\,\text{V}\).
Explain order and molecularity of a reaction giving example.
In solution Cu$^+$ ions are colourless while Cu$^{2+$ ions are coloured. Why?}
Explain unidentate and bidentate ligands giving examples.
Which of the following ions does not form coordination compound?
Acetic acid reacts with hydrazoic acid in the presence of conc. H$_2$SO$_4$ at 0$^\circ$C to form –
Bromination of Aniline gives –
Product obtained by hydrolysis of inulin is –
Define Raoult's Law and explain it.
The concentration of 0.2 M H$_2$SO$_4$ solution will be in g/L –
In the following ions which one is a paramagnetic ion?