List of top Chemistry Questions

Describe Ostwald’s process for the industrial manufacture of nitric acid. Write the balanced chemical equations of the following reactions: (i) Zinc metal reacts with conc. HNO$_3$
(ii) Iodine reacts with conc. HNO$_3$
Discuss the mechanism of unimolecular and bimolecular nucleophilic substitution reactions in haloalkanes.
What happens when Sulphur dioxide reacts with acidic potassium permanganate? Write balanced chemical equation for this reaction.
Give reason that bleaching action of chlorine is permanent while that of SO$_2$ is temporary.
Write a short note on Coagulation.
Zn$^{2+}$ salts are colourless while Ni$^{2+}$ salts are coloured. Why?
Write a short note on Gabriel’s phthalimide synthesis. Why is Gabriel’s phthalimide synthesis preferred for synthesizing the primary amines?
What do you mean by D and L configurations of carbohydrates? Draw the structural formula of D-Glucose and D-Fructose.
‘Action of soap is based on the emulsification and micelle formation.’ Comment on it.
What is half-life for a chemical reaction? Show that the half-life for a first order reaction is independent of the initial concentration of the reactants.
Write a short note on primary and secondary structures of proteins.
$H_2O$ is a liquid while $H_2S$ is a gas. Why?
Define Lyophilic and Lyophobic colloids with examples. Why is Lyophobic colloids easily coagulated?
Explain Kohlrausch’s law of independent migration of ions. Mention one application of this law.
Calculate the packing efficiency of body centred cubic (b.c.c.) unit cell.
Define Osmotic pressure. How will you show that Osmotic pressure is a colligative property?
Which of the following base is not present in DNA?
The crystal system having dimensions $a \neq b \neq c$ and $\alpha = \beta = \gamma = 90^\circ$ is:
What is Schottky defect? What is the effect of the presence of Schottky defect on the density of lattice?
Hinsberg’s reagent is –
Benzyl alcohol is obtained from benzaldehyde by –
The unit of velocity constant for first order reactions is:
The concentration unit independent of temperature is:
Write chemical equations of two methods of preparation of monohydric alcohol and also write chemical equation of the reactions of ethyl alcohol with conc. sulphuric acid (H$_2$SO$_4$) at different temperatures.
What is Aqua Regia? What happens when aqua regia reacts with (i) Gold, and (ii) Platinum.