List of top Chemistry Questions

Acidified potassium permanganate solution oxidises oxalic acid. The spin-only magnetic moment of the manganese product formed from the above reaction is ______ B.M. (Nearest Integer)

Outermost electronic configurations of four elements A,B,C,D are given below:
(A) 3s2 (B) s23p1 (C) 3s23p3 (D) 3s23p4
The correct order of fist ionization enthalpy for them is:

Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?
When 200 mL of 0.2 M acetic acid is shaken with 0.6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0.1 M. The mass of acetic acid adsorbed per gram of carbon is _____ g.
In the structure of SF4, the lone pair of electrons on S is in.
The correct decreasing order of priority of functional groups in naming an organic compound as per IUPAC system of nomenclature is
Which amongst the following is not a pesticide?
(a) Baryte,
(b) Galena, 
(c) Zinc blende and 
(d) Copper pyrites. 
How many of these minerals are sulphide based?
A box contains 0.90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0 Torr. When the volume of the box is increased, some of the liquid water evaporates to maintain the equilibrium pressure. 
If all the liquid water evaporates, then the volume of the box must be ______ litre. [nearest integer]
(Given : R = 0.082 L atm K–1 mol–1] (Ignore the volume of the liquid water and assume water vapours behave as an ideal gas.)

The major product (P) in the reaction
 





is

In the titration of KMnO4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is _____.
Kjeldahl’s method was used for the estimation of nitrogen in an organic compound. The ammonia evolved from 0.55 g of the compound neutralised 12.5 mL of 1 M H2SO4 solution. The percentage of nitrogen in the compound is _____. (Nearest integer)
Which amongst the given plots is the correct plot for pressure \((p)\) vs density \((d)\) for an ideal gas?

Match List-I with List-II
 

List-IList-II
(A) Glucose + HI(I) Gluconic acid
(B) Glucose + Br2 water(II) Glucose pentacetate
(C) Glucose + acetic anhydride(III) Saccharic acid
(D) Glucose + HNO3(IV) Hexane
The structure of protein that is unaffected by heating is
Which will have the highest enol content?

Given below are two statements:

Statement I: [Ni(CN)4]2– is square planar and diamagnetic complex, with dsp2 hybridization for Ni but [Ni(CO)4] is tetrahedral, paramagnetic and with sp3-hybridization for Ni.
Statement II: [NiCl4]2– and [Ni(CO)4] both have same d-electron configuration, have same geometry and are paramagnetic.

In light of the above statements, choose the correct answer from the options given below :

The plot of pH-metric titration of weak base NH4OH vs strong acid HCl looks lie:
At \(298\ K\), the equilibrium constant is \(2 × 10^{15}\) for the reaction:
\(Cu(s)+2Ag+(Aq)⇌Cu^{2+}(aq)+2Ag(s)\)
The equilibrium constant for the reaction:
\(\frac 12Cu^{2+}(aq)+Ag(s)+(Aq)⇌\frac 12Cu(s)+Ag^+(aq)\) is \(x \times10^{-8}\).
The value of \(x\) is ______ . (Nearest integer)
In the flame test of a mixture of salts, a green flame with blue centre was observed. Which one of the following cations may be present?
The major product of the following reaction is
The major product of the following reaction
White phosphorus reacts with thionyl chloride to give
Which statement is NOT correct for p-toluenesulphonyl chloride?
The solubility product of a sparingly soluble salt \(A_2X_3\) is \(1.1 × 10^{–23}\). If the specific conductance of the solution is \(3×10^{–5}\) S m–1, the limiting molar conductivity of the solution is \(x×10^{–3}\) S m2 mol–1. The value of x is _______.
The correct order of melting point is