List of top Questions asked in UP Board XII

Differentiate between molar and molal elevation constants. Give two different formulae involving these two constants for the determination of molecular mass of solute.

Describe Ostwald’s process for the manufacture of nitric acid. How will you detect NO$_3^-$ radical in this acid? Give equations for reactions involved.

Using IUPAC norms, write the systematic names of the following: (i) [Co(NH$_3$)$_6$]Cl$_3$
(ii) K$_3$[Cr(C$_2$O$_4$)$_3$]
(iii) [Pt(NH$_3$)$_2$Cl$_2$]
(iv) [Ni(CO)$_4$]

Amino acids are structural units of:

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%.}

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 $E^\circ_{(Cu^{2+}/Cu)} = +0.34 \, V$

Differentiate between lyophilic and lyophobic colloids.

What is Kohlrausch’s law? Write its one application with example.

Give any two dehydrating properties of H$_2$SO$_4$.

1 : 1 Molar mixture of FeSO$_4$ and (NH$_4$)$_2$SO$_4$ gives test of Fe$^{2+$ ions, but 1 : 4 molar mixture of CuSO$_4$ and NH$_3$ (aq) does not give test of Cu$^{2+}$ ions. Why?}

Explain the Resonance effect in nucleophilic substitution reactions of Haloarenes.

Write chemical equations of reactions of haloalkanes with two metals.

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.

Molarity of pure water is:

Unit of specific conductance is:

Noble gas which forms maximum number of compounds is:

Formation of coloured ions is possible due to the presence of:

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.

Write chemical equation and mechanism of acid catalysed hydration of Alkene.

Write chemical equation for identifying primary and secondary alcohol.

In spite of being an electron withdrawing group, why does chlorine act as ortho-para directing group in aromatic electrophilic substitution reactions?

Write notes on the following:
(I) Wurtz–Fittig reaction
(II) Sandmeyer reaction

Write Nernst equation and its one application in chemical cells.