List of top Chemistry Questions

The correct sequence of increasing covalent character is represented by

The monomer of the polymer

The mass of carbon anode consumed (giving only carbondioxide) in the production of $270\, kg$ of aluminium metal from bauxite by the Hall process is (Atomic mass $Al =27$ )

Which one of the following compounds is most acidic?

In a set of reactions, acetic acid yielded a product $D$. $CH _{3} COOH {->[{ SOCl _{2}}]}A {->[{\text { Benzene }}][{\text { anhyd. } AlCl _{3}} ]} B {->[{ HCN }]} C {->[{ HOH }]} D$ The structure of $D$ would be

The amino acid which is not optically active is

Ellingham diagram represents a graph of

Decomposition of benzene diozonium chloride by using $Cu_2Cl_2/HCl$ to form chlorobenzene is

Benzene reacts with chlorine in sunlight to give a final product

If for a sucrose solution, elevation in boiling point is $0.1^{\circ} C, $ then what will be the boiling point of $NaCl$ solution for same molal concentration?

A sample of rock from moon contains equal number of atoms of uranium and lead. $t_{1 / 2}$ for $U =4.5 \times 10^{9}$ years. The age of the rock would be :

The number of waves in an orbit are :

In which of the following molecules are all the bonds not equal?

The electronegativity difference between N and F is greater than that between N and H yet the dipole moment of NH₃ (1.5 D) is larger than that of NF₃ (0.2 D). This is because:

The enthalpy of combustion of H₂, cyclohexene (C₆H₁₀) and cyclohexene (C₆H₁₂) are -241, -3800 and -3920 kJ per mol respectively. Heat of hydrogenation of cyclohexene is:

Assume each reaction is carried out in an open container. For which reaction will ∆H = ∆E?

The enthalpy and entropy change for the reaction : Br₂(l) + Cl₂(g) → 2BrCl(g) are 30 kJ mol^-1 and 105 JK^-1 mol^-1 respectively. The temperature at which the reaction will be in equilibrium is :

More number of oxidation states are exhibited by the actinides than by the lanthanides. The main reason for this is:

In which of the following pairs are both the ions coloured in aqueous solution? (Atomic number: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

The general molecular formula, which represents the homologous series of alkanols is :

[Cr(H₂O)₆]Cl₃ (at. no. of Cr = 24) has a magnetic moment of 3.83 BM, the correct distribution of 3d electrons in the chromium of the complex is:

Photochemical smog pollution does not contain:

A hypothetical electrochemical cell is shown below 
\(A|A+ (xM)|| B+ (yM)| B \)
The emf measured is +0.20 V. The cell reaction is:

If E°_Fe²⁺/Fe = -0.441 V and E°_{Fe³⁺/Fe²⁺} = 0.771 V, the standard emf of the reaction: Fe + 2Fe³⁺ \(→\) 3Fe²⁺ will be:

During osmosis, flow of water through a semi-permeable membrane is :