List of top Chemistry Questions

The following reaction:
\[ {CH}_3{Br} + {AgF} \rightarrow {CH}_3{F} + {AgBr} \] is known as:
Which of the following cannot be prepared by the reduction of either a ketone or an aldehyde with NaBH\(_4\) in methanol?
The alkene that exhibits optical isomerism is:
In which of the following reaction Lindlar's catalyst is used?
The IUPAC name of the co-ordination compound \([Co(NH_3)_4(H_2O)Cl]Cl_2\) is:
Which lanthanide element has half-filled 4f orbitals in its +3 state?
Which of the following explains why dimethyl ether has lower boiling point than its isomeric compound, ethanol?
Which of the following 3d block element exhibits +2, +3, +4, +5, +6 and +7 oxidation states?
For which of the following molecules, resonance structures are necessary to describe the bonding satisfactorily?
For which one of the following equilibria, \( K_P = K_C \)?
In which of the following equilibrium, increase in pressure shifts the equilibrium in the forward direction?
The sum of the oxidation numbers of all the carbon and oxygen atoms in carbonate ion is:
Some enzyme catalysed reactions which occur at metal surfaces are:
Which of the following aqueous mixture is a buffer solution?
Which of the following molecule has the highest dipole moment?
Which of the following isoelectronic species has the smallest radius?
The number of angular and radial nodes present in '4d' orbitals are respectively:
What is the mass of water formed when 1.6 g of methane gas is completely burnt in excess oxygen?
The correct electronic configuration of Tc (Z = 43) is:
Among the hydrides \( NH_3, PH_3, \) and \( BiH_3 \), the hydride with highest boiling point is \( X \) and the hydride with lowest boiling point is \( Y \). What are \( X \) and \( Y \) respectively?
In the reaction: \[ NH_2CONH_2 + 2H_2O \rightarrow [X] \rightleftharpoons 2NH_3 + H_2O + [Y] \] The hybridization of carbon in \( X \) and \( Y \) respectively are:
10 mL of 0.5 M NaCl is required to coagulate 1L of \( Sb_2S_3 \) sol in 2 hours time. The flocculating value of NaCl (in millimoles) is:
Kaolinite is a silicate mineral of metal 'X' and calamine is a carbonate mineral of metal 'Y'. X and Y respectively are:
In which of the following ions the spin-only magnetic moment is lowest?

The number of -OH groups present in the structures of bithionol, terpineol, and chloroxylenol is respectively: