List of top Chemistry Questions

How many enolizable hydrogens are there in the compound 2-methylcyclohex-2- en -1 -one?

Following reaction can produce three products. The order of their amount is

A weak acid with pKa 5.9 and weak base with pKb 5.8 are mixed in equal proportions. pH of the resulting solution is

The conductivity of centimolar solution of KCI at 25°C is 0.0210 ohm^-1cm^-1 and the resistance of the cell containing the solution at 25°C is 60 ohm. The value of the cell constant is :

The density of $3 M$ solution of $NaCl$ is $10 \,g \,mL -1$. Molality of the solution is _______ $\times 10^{-2} m$ (Nearest integer). Given: Molar mass of Na and $Cl$ is $23$ and $355 \,g \,mol ^{-1}$ respectively.

A sample of water is found to contain 5.85% $(\frac{w}{w})$ of AB (molecular mass 58.5) and 9.50% $(\frac{w}{w})$ XY₂ (molecular mass 95). Assuming 80% ionisation of AB and 60% ionisation of XY₂ , the freezing point of water sample is
[Given : K_f for water 1.86 K kg mol^-1 , Freezing point of pure water is 273 K and A, B and Y are monovalent ions]

Consider the following two statements:
Statement I: Among Mg, Al, Mg$^2$, Al$^3$, the one having smallest size is Al$^3$
Statement II: Eu is having exceptionally high atomic radii among lanthanide elements The correct answer is:

Identify the pair of elements with the highest and lowest electronegativity respectively

Which one is an example of heterogenous catalysis?

Identify incorrectly matched set from the following

An ideal gas (X) present in a vessel of volume $ V $ exerted a pressure of 16.4 atm at 200 K. What is its concentration in mol $ L^{-1} $? Given Data Given $ R = 0.082 \, \text{L atm mol}^{-1} \text{K}^{-1} $

A 100 L cylinder containing H2 exerted a pressure of 4 atm at 300 K. It was accidentally opened and some H2 was escaped. When it was closed, it exerted a pressure of 3 atm at 300 K. The number of moles of H2 remaining in the cylinder is equal to

An ideal gas (X) present in a vessel of volume $ V $ exerted a pressure of 16.4 atm at 200 K. What is its concentration in mol $ L^{-1} $? % Given Data Given $ R = 0.082 \, \text{L atm mol}^{-1} \text{K}^{-1} $

If the standard enthalpy change ($\Delta H^o$) for a certain reaction at 298 K and constant pressure is -1860 kJ mol$^{-1}$, the standard entropy change ($\Delta S^o$) of the same reaction is -550 J K$^{-1}$ mol$^{-1}$, which of the following statements is correct?

The O-H bond length in $ H_2O $ in gas phase is

Which of the following alloys are correctly matched with their uses? \[ \text{i) Li/Mg} \quad \text{armour plates} \] \[ \text{ii) Cu/Be} \quad \text{high strength springs} \] \[ \text{iii) Mg/Al} \quad \text{aircraft construction} \]

Choose the acidic oxide from the following:

In the Kolbe electrolysis of sodium propanoate, the products X and Y are formed at the respective electrodes. What are X and Y?

20 mL of 0.1 M HCl is added to 30 mL of 0.1 M NaOH. To this solution, extra 50 mL of water was added. What is the molarity of the final solution formed?

For the reaction A + B → C, the following data were obtained:

The order of reaction with respect to A and B are respectively

The correct statements about Zeolites are:
1. They are good shape selective catalysts
2. They contain Al-O-Si framework
3. They are not found in nature
4. They are used as catalysts for cracking hydrocarbons in the petrochemical industry.

How many of the following metals can be purified by using zone refining method? Ni, B, Ti, In, Ge, Mn, Ag, Si, Ga

For ozone molecule consider the following:
1. It is a linear molecule with bond angle $180^\circ$
2. It is an angular molecule with bond angle $117^\circ$
3. The bond lengths of both O-O bonds are same
4. With respect to oxygen it is thermodynamically more stable
The correct options are

From the list given below, the number of lanthanides which exhibit +4 state in their compounds is: Given lanthanides: Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy

Monomers of nylon 2-nylon 6 are: