List of top Questions asked in UP Board XII

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: $k=2.5\times10^{-4}\ \mathrm{mol\,L^{-1}\,s^{-1}}$)
Which compound of the following does \(\underline{not}\) reduce Fehling's solution?
How many primary amines are possible for the formula C$_4$H$_{11$N?}
Deficiency of which vitamin causes scurvy?
What is the relation between elevation in boiling point and molality?
Aqueous solutions of HgCl$_2$ and SnCl$_2$ cannot co-exist, why?
Prove with example that [Co(NH$_3$)$_5$Cl]SO$_4$ and [Co(NH$_3$)$_5$SO$_4$]Cl are ionisation isomers.
100 ml of 10 M HCl is mixed with 75 ml of 10 M Na$_2$CO$_3$. The resulting solution would be –
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 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).}
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)
Explain primary, secondary, tertiary and quaternary structures of protein in detail.
Explain the mechanism of substitution reactions of Haloalkane.
Explain optical activity, chirality, retention, inversion and racemisation in Haloalkane.
Write chemical equations of dehydration reactions of primary, secondary and tertiary alcohols and also write mechanism of dehydration reaction of primary alcohol.
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.
Write chemical equation for two methods of preparation and three chemical properties of carboxylic acid.
Write chemical equation and the method of preparation of ethanol from molasses.
Explain the nature of carbonyl group and carboxylic group.
Write chemical equation of two chemical properties of glucose.
The vapour pressure of pure benzene at any temperature is 0.850 bar. 0.5 g non-volatile non-electrolytic solid is dissolved in 39.0 g benzene (molar mass 78 g mol$^{-1}$). The vapour pressure of the solution is 0.845 bar. Calculate the molar mass of the solid.