List of top Chemistry Questions asked in UP Board XII

Calculate the standard e.m.f. of the following cell:
Zn $\mid$ Zn$^{2+}$ $\parallel$ Cu$^{2+}$ $\mid$ Cu
Given: $E^\circ_{(Zn^{2+}/Zn)} = -0.76 \, V$ and $E^\circ_{(Cu^{2+}/Cu)} = +0.34 \, V$
What is Kohlrausch’s law? Write its one application with example.
Calculate the mass of a non-volatile solute (molar mass $40 \, \text{gm mol}^{-1}$) which should be dissolved in $114 \, \text{gm$ octane to reduce its vapour pressure to 80%.}
Differentiate between lyophilic and lyophobic colloids.
Molarity of pure water is:
Formation of coloured ions is possible due to the presence of:
Write chemical equations of reactions of haloalkanes with two metals.
Explain the Resonance effect in nucleophilic substitution reactions of Haloarenes.
Noble gas which forms maximum number of compounds is:
Write short notes on the following:
(i) Aldol and Crossed Aldol Condensation in Aldehyde and Ketone
(ii) Cannizzaro Reaction
Write chemical equations of five methods of preparation of Carboxylic acid.
Unit of specific conductance is:
Explain Crystal Field Theory (CFT) in coordination compounds and write its limitations.
Describe the industrial method of preparation of Ammonia giving flow diagram and chemical equation and write chemical equation of the reaction of Ammonia with (i) Copper ion, and (ii) Silver ion.
In spite of being an electron withdrawing group, why does chlorine act as ortho-para directing group in aromatic electrophilic substitution reactions?
Write chemical equation for identifying primary and secondary alcohol.
Write chemical equation and mechanism of acid catalysed hydration of Alkene.
Write notes on the following:
(I) Wurtz–Fittig reaction
(II) Sandmeyer reaction
Explain Adsorption theory of heterogeneous catalysis.
Write electronic configuration of Cr (Z = 24) and Cu (Z = 29) and also explain two main characteristics of transition elements.
Explain osmotic pressure of solution. Establish a relationship between osmotic pressure of solution and molar mass of solute.
Differentiate between primary, secondary and tertiary amines. (Write chemical equations)
Explain average and instantaneous rate of reaction and describe two factors which affect them.
Write Nernst equation and its one application in chemical cells.
Explain the difference between DNA and RNA.