List of top Chemistry Questions

Match the following substances with their respective equivalent weights: 

Identify the pair of elements in which the number of s-electrons to p-electrons ratio is 2:3:
In which of the following options, the IUPAC name is not correctly matched with the structure of the compound?
The products formed in the reaction of \( BeCl_2 \) with \( LiAlH_4 \) are

What are \( X \) and \( Y \) respectively in the following reactions?

X → CO B2H6 → NaH → (C2H5)2O Y

Options:

  • (1) BH3, 2CO; NaBO2
  • (2) BH3, CO; NaBH4
  • (3) BH3, CO; NaBO2
  • (4) BH3, CO; Na2B4O7

Two statements are given below: Statement I: Molten NaCl is electrolysed using Pt electrodes. \( Cl_2 \) is liberated at the anode. 
Statement II: Aqueous CuSO\(_4\) is electrolysed using Pt electrodes. \( O_2 \) is liberated at the cathode. The correct answer is:

The correct formula of borax is Na\(_2\)[B\(_4\)O\(_5\)(OH)\(_x\)]·yH\(_2\)O. The sum of \(x\) and \(y\) is:
Identify the major product \((P)\) in the following reaction sequence: \[ (\text{CH}_3)_3\text{CBr} \xrightarrow[\Delta]{\text{Alcoholic KOH}} X \xrightarrow{\text{HBr}} P \]
Identify the set which is not correctly matched in the following:
Phosphodiester linkage that joins nucleotides together is present between which carbons of pentose sugar?
Which of the following is correct?
correct order of compound
Find the total volume of a unit cell given the radius of the atom.
Total number of stereo isomers possible for the given structure :
Major product of the following reaction is -
Which of the following ions will be coloured in the aqueous solution?
(A) Ti3+
(B) Nb3+
(C) Cu+
(D) Y3+
Choose the correct answer from the options given below:
A reaction A$_2$ + B$_2$ → 2AB occurs by the following mechanism:
A$_2$ → A + A (slow)
A + B$_2$ → AB + B (fast)
A + B → AB (fast)
Its order would be:
Which one of the following compounds is having maximum 'lone pair-lone pair' electron repulsions?
The bond dissociation energy of X\(_2\), Y\(_2\) and XY are in the ratio of 1 : 0.5 : 1. \(\Delta H\) for the formation of XY is -200 kJ/mol. The bond dissociation energy of X\(_2\) will be
Volume of M/8 KMnO$_4$ solution required to react completely with 25.0 cm$^3$ of M/4 FeSO$_4$ in acidic medium is:

Correct order of stability of carbanion is: 
 

Which of the following is only a redox reaction but not a disproportionation reaction?
20 mL of 0.1 M acetic acid is mixed with 50 mL of potassium acetate. \( K_a \) of acetic acid \( = 1.8 \times 10^{-5} \) at 27°C. Calculate the concentration of potassium acetate if the pH of the mixture is 4.8.
The ionic radii in (\({Å}\)) of \({N}^{3-}\), \({O}^{2-}\) and \({F}^-\) are respectively.
The pH of 1 N aqueous solutions of HCl, CH$_3$COOH and HCOOH follows the order: