List of top Chemistry Questions asked in UP Board XII

Explain Faraday's laws of electrolysis.
How will you convert ethanol into the following compounds? Write chemical equation only.
(i) 3-Hydroxybutanol (ii) But-2-enal
6 g urea is dissolved in 200 g water. Calculate the elevation in boiling point. Molal elevation constant for water is 0.52 K kg mol$^{-1$.}
Decomposition of NH$_3$ on the surface of platinum is a zero–order reaction. What will be the rate of formation of N$_2$ and H$_2$? \; (Given: $k=2.5\times10^{-4}\ \mathrm{mol\,L^{-1}\,s^{-1}}$)
Write the definition of osmotic pressure. Calculate the osmotic pressure of 2% aqueous solution of urea at 27$^\circ$C. Solution constant $R = 0.082\ \text{L atm K^{-1}\ \text{mol}^{-1}$.}
Ketones do not reduce Fehling's solution and Tollen's reagent while fructose containing ketonic group does. Why?
Write the names of the reagents used in the following reactions:
i) Conversion of benzyl alcohol into benzoic acid
ii) Formation of butan-2-ol from butan-2-one
Complete the following chemical equation: \(\; \mathrm{C_2H_5Br} \xrightarrow[\text{}]{\mathrm{KOH(aq)} (A) \xrightarrow[\Delta]{\mathrm{K_2Cr_2O_7,\;H_2SO_4}} (B)\).}
Deficiency of which vitamin causes scurvy?
Aqueous solutions of HgCl$_2$ and SnCl$_2$ cannot co-exist, why?
How many primary amines are possible for the formula C$_4$H$_{11$N?}
Which compound of the following does \(\underline{not}\) reduce Fehling's solution?
What is the relation between elevation in boiling point and molality?
Prove with example that [Co(NH$_3$)$_5$Cl]SO$_4$ and [Co(NH$_3$)$_5$SO$_4$]Cl are ionisation isomers.
Number of unpaired electrons in Cu$^{2+$ (Z = 29) is –}
Total how many ions are there in [Co(NH$_3$)$_5$Cl]Cl$_2$ solution?
Write chemical equation of five chemical properties of amines.
Write chemical equations of three methods of preparation of amine and also write the mechanism of ammonolysis of alkyl halides.
Write chemical equations of dehydration reactions of primary, secondary and tertiary alcohols and also write mechanism of dehydration reaction of primary alcohol.
Write the formula of the following coordination compounds:
(i) Hexa aqua chromium (III) chloride
(ii) Dichlorido diammin e platinum (II)
(iii) Hexa ammine platinum (IV) chloride
(iv) Sodium penta cyano nitrosyl ferrate (II)
Write chemical equation for two methods of preparation and three chemical properties of carboxylic acid.
Write chemical equations for obtaining the following from phenol:
(i) 4-Nitrophenol
(ii) Picric acid
(iii) 4-Bromophenol
(iv) Salicylaldehyde
(v) Benzoquinone
Write chemical equation for five methods of preparation of Ketones.
Explain the mechanism of substitution reactions of Haloalkane.
Write unit of first order reaction. The initial concentration of N$_2$O$_5$ at 318 K was $0.60\times 10^{-2$ mol L$^{-1}$ in the first order reaction, which became $0.20\times 10^{-2}$ mol L$^{-1}$ after 60 min. Calculate the velocity constant at 318 K. (log 3 = 0.4771).}