List of top Chemistry Questions

The resistance of a conductivity cell, filled with 0.1 mol L\(^{-1}\) KCl solution is 100 \(\Omega\). If the resistance of this cell is 500 \(\Omega\) on filling 0.02 mol L\(^{-1}\) KCl solution, then calculate the conductivity and molar conductivity of 0.02 mol L\(^{-1}\) KCl solution. The conductivity of 0.1 mol L\(^{-1}\) KCl solution is 1.29 S m\(^{-1}\).
Differentiate between the following: (i) True solution and suspension
(ii) Lyophilic and Lyophobic colloid
(iii) Multimolecular and Macromolecular colloid
Differentiate between the structures of D-glucose and D-fructose.
Write short notes on the following: (i) Secondary structure of proteins
(ii) Peptide bond
(iii) Monosaccharides
Give reasons of the following: (i) Aniline does not exhibit Friedel–Crafts reaction.
(ii) Ethyl amine is soluble in water while aniline is not.
What do you understand by osmosis and osmotic pressure? 1.26 g protein is present in 200 cm\(^3\) aqueous solution of protein. Molar mass of protein is 61,022 g mol\(^{-1}\). What will be osmotic pressure of this solution at 300 K?
Justify with reasons: (i) Why does physical adsorption decrease on increasing temperature?
(ii) Why are powdered materials better effective adsorbents in comparison to their crystalline forms?
Calculate the packing capacity (efficiency) of a simple cubic lattice.
Give answers: (i) Why does the conductivity of any solution decrease with dilution?
(ii) Conductivity of 0.20 M KCl solution at 298 K is 0.248 S cm\(^{-1}\). What will be its molar conductivity?
The structure of a cell of an element is body-centred cubic (bcc). The length of the core of the cell is 200 pm. Density of the element is 7 g/cm\(^3\). Determine the number of atoms in 20 g element.
Carbylamine reaction gives:
Cannizzaro’s reaction is exhibited by:
The base not present in RNA is:
Velocity constant (k) for a reaction is \(2.3 \times 10^{-5} \, L \, mol^{-1} s^{-1}\). Order of the reaction will be:
Initial concentration of N\(_2\)O\(_5\) in a first-order reaction was \(1.24 \times 10^{-2}\) mol L\(^{-1}\) at 310 K, which remained \(0.20 \times 10^{-2}\) mol L\(^{-1}\) after 30 minutes. Calculate velocity constant at 310 K. \((\log_{10} 6.2 = 0.7924)\)
Write short notes on the following: (i) Kolbe Electrolysis:
What happens when (Give chemical equations only): (i) Acetaldehyde reacts with dilute NaOH:
In a 200 g solution of glucose with 10% mass per cent, amount of glucose will be:
How can the following changes be done? (Give chemical equations only) (i) Propan-1-ol from ethyl magnesium chloride:
Give chemical equation for the following reactions: (i) Oxidation of propan-1-ol with alkaline KMnO\(_4\):
Write IUPAC names of the following: (i) CH\(_3\)CH = CH-CH\(_3\) Br
(ii) (CH\(_3\))\(_3\)-C-CH\(_2\)(Br)
(iii) CH\(_3\)CH\(_2\)-C-CH(Cl)CH\(_2\)CH\(_3\)
(iv) (CH\(_3\))\(_2\)CBrCH\(_2\)CH\(_3\)
(v) (CH\(_3\))\(_3\)Cl
What happens when (give chemical equations only): (i) Concentrated H\(_2\)SO\(_4\) is added in calcium fluoride?
(ii) SO\(_3\) is passed in water?
(iii) Calcium hydroxide reacts with ammonium chloride?
(iv) Concentrated sulphuric acid and copper metal is heated?
(v) Chlorine gas is passed in cold caustic soda solution?
Describe the method of preparation of dinitrogen in the laboratory and also write the chemical equations of the reactions. Write the reactions of dinitrogen with (i) oxygen and (ii) magnesium at high temperature. What is its reaction with hydrogen in presence of catalyst at 773 K temperature?
What are transition elements? Write the names and electronic configuration of the elements of the first transition series. Transition metals and their maximum compounds are paramagnetic. Explain.
Write short notes on the following: (i) Tyndall Effect
(ii) Brownian Movement
(iii) Coagulation