List of top Chemistry Questions

The mass of particle X is four times the mass of particle Y. The velocity of particle Y is four times the velocity of X. The ratio of de Broglie wavelengths of X and Y is:

Hydrolysis of XeF$_4$ gives HF, O$_2$, Xe and 'X'. The structure of 'X' is

The correct formula used to determine the formal charge ($ Q_f $) on an atom in the given Lewis structure of a molecule or ion is (V = number of valence electrons in free atom, U = number of unshared electrons on the atom, B = number of bonds around the atom)

Identify the correctly matched set from the following:

Which of the following sweeteners use is limited to soft drinks?

The mass % of urea solution is 6. The total weight of the solution is 1000 g. What is its concentration in mol L$^{-1}$? (Density of water = 1.0 g mL$^{-1}$)
(Given: C = 12u, N = 14u, O = 16u, H = 1u)

Benzoic acid undergoes dimerization in benzene. $ x $ g of benzoic acid (molar mass 122 g mol$^{-1}$) is dissolved in 49 g of benzene. The depression in freezing point is 1.12 K. If degree of association of acid is 88%, what is the value of $ x $? (K$_f$ for benzene = 4.9 K kg mol$^{-1}$)

What are X and Z in the following reaction sequence?

The disproportionation products of ortho phosphorous acid are:

Which of the following polymerisation leads to the formation of neoprene?

The correct statements about the adsorption of gas on solid adsorbent are:
Adsorption is always exothermic. Physisorption may transform into chemisorption at high temperature. Physisorption increases with increasing temperature but chemisorption decreases with increasing temperature. In physisorption enthalpy of adsorption is 100 kJ mol$^{-1}$.

Identify the products formed when zinc reacts with sodium hydroxide solution. Options:

Match the following:

Match the following:

Which of the following orders are correct regarding their covalent bond character?
i. KF $<$ KI
ii. SnCl2 $<$ SnCl4
iii. NaCl $<$ CuCl

Two of the products formed by the reaction of $X$ with HCl are gases. What is $X$? HCl with $X$ forms gaseous products, two of which are identified.

Identify B in the given reaction sequence:

Which of the allotropic forms of carbon is aromatic in nature?

What are $ X $ and $ Y $ respectively in the following reaction sequence? \begin{center} \includegraphics[]{139.png} \end{center}

What is the percentage of carbon in the compound X, formed in the given sequence of reactions?

Identify Z in the following reaction sequence.

An alkyl halide C$_4$H$_8$Br(X) undergoes hydrolysis preferably in polar protic solvents. X can be prepared from which of the following reactants?

Match the following bond enthalpies with their respective bonds:

Match List I with List II and select the correct answer.

The structure given below represents: