List of top Chemistry Questions

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)$_4$]

Ketones do not reduce Fehling’s solution and Tollen’s reagent, while fructose containing ketonic group does. Why?

Explain with reason: (i) The colloidal solution of Fe(OH)$_3$ obtained from FeCl$_3$ is positively charged.
(ii) Alum is used for the purification of water.
(iii) Rivers form a delta while joining a sea/ocean.

Prove the presence of five –OH groups and a –CHO group in glucose molecule, giving chemical equations. How is silver mirror formed from glucose?

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?}

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.

Amino acids are structural units of:

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

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

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

Write short notes on the following:
(i) Aldol and Crossed Aldol Condensation in Aldehyde and Ketone
(ii) Cannizzaro Reaction

Explain the Resonance effect in nucleophilic substitution reactions of Haloarenes.

Write chemical equations of reactions of haloalkanes with two metals.

Noble gas which forms maximum number of compounds is:

Write chemical equations of five methods of preparation of Carboxylic acid.

Unit of specific conductance is:

Molarity of pure water is:

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

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.

Explain Crystal Field Theory (CFT) in coordination compounds and write its limitations.

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?