List of top Chemistry Questions

An aromatic compound 'A' C7H6Cl2  gives white precipitate on boiling with AgNO3 solution and yields C7H7OCl on treatment with NaOH.  'A' on oxidation gives a monochloro benzoic acid which affords only one mononitroderivative.  The compound A is:
The shapes of the compounds XeF2, XeF4, XeO3 and XeO4 respectively are:

Directions: The answer to the following question is a single digit integer ranging from 0 to 9. Enter the correct digit in the box given below.

How many open chain structures are possible for N-Methly butanamine (including it) that are referred to as metamers.

Which of the following are amongst the few carbon-containing compounds NOT classified as organic?
The correct order of atomic radii is:
The enthalpy of vaporisation of a substance is 8400 J mol−1 and its boiling point is −173.15∘C. The entropy change for vaporisation is:
If the ionisation potential of the hydrogen atom is 13.6eV, then what will be the longest wavelength needed to remove an electron from the 1st  Bohr's orbit of He+ ion?
The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used. Calculate the work function for silver metal.
Given:
(i) Cu2++2e−→Cu,E0=0.337 V
(ii) Cu2++e−→Cu+,E0=0.153
Standard electrode potential, E∘ for the reaction, Cu+e−→Cu, will be (in volts):

Chemical A is used for water softening to remove temporary hardness, A reacts with Na2Co3 to generate caustic soda. When CO2 is bubbled through A, it turns cloudy. If  the chemical formula of A is \(Ca (OH)_{2} + CO_{2}  \rightarrow  CaCo_{?}  \downarrow + H_{2}O   \)  then what is the value of ?

Hydrogen ion concentration of an aqueous solution is 1 × 10-4 M.  The solution is diluted with equal volume of water.  Hydroxyl ion concentration of the resultant solution in terms of p×10-10 mol dm-3 . What is the value of p?
Benzoic acid contains

Consider the following statements related to colloids. 
(I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium. 
(II) For emulsions, both the dispersed phase and the dispersion medium are liquid. 
(III) Micelles are produced by dissolving a surfactant in any solvent at any temperature. 
(IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium.
The option with the correct set of statements is

Among the following species, identify the pair having same bond order $ C{{N}^{-}},O_{2}^{-},N{{O}^{+}},C{{N}^{+}} $
What weight of $CaCO_3$ must be decomposed to produce the sufficient quantity of carbon dioxide to convert $21.2\, kg$ of $Na_2CO_3$ completely in to $NaHCO_3$. [Atomic mass $Na = 23$, $Ca = 40$] $CaCO_3 \to CaO + CO_2$ $Na_2CO_3 + CO_2 + H_2O \to 2NaHCO_3$
The periodic table of today owes its development to two chemists namely
Number of water molecules in one drop of water, if $1$ ml of water has $20$ drops and $A$ is Avogadro number, is
Product B is:
ethoxy benzene reacts with HNO3/H2SO4
Match the column.
Column-I
(Compounds)		Column-II
(Configurations)
A.TiCl4(1)e3t23
B.FeO42-(2)e2t20
C.FeCl42-(3)e2t23
D.MnCl42-(4)e0t20
Consider the following reaction: The product is
hydrocarbons
Find out value of $C_p/C_y$ for an ideal gas undergoing reversible adiabatic process for which $P ∝ T^3$ is given
Which of the following is true regarding coagulation of egg:
From the given information, calculate enthalpy of formation of 2 moles of $C_6H_6$(l) at 25°C. Given: $CH(C_6H_6$(l)) = –3264.6 kJ/mol $CH(C(s))$ = –393.5 kJ/mol $fH(H_2O(l))$ = –285.83 kJ/mol
Find out E cell of the given cell M | M2+ | | x2-|x.|
EºM2+I M = 0.34 V
E°x|x2- = 0.46 V
The molarity of NaCl solution is 3 M. Calculate the morality of the solution. (Given density of the solution = 1.25 g/mL)