List of top Chemistry Questions

The structure given below represents:

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

Which of the following is insoluble in water?

At $ T $ (K), the following data was obtained for the reaction: $ S_2O_8^{2-} + 3 I^- \rightarrow 2 SO_4^{2-} + I_3^- $.

From the data, the rate constant of the reaction (in $ M^{-1} s^{-1} $) is:

The number of extensive properties in the following list is: Enthalpy, density, volume, internal energy, temperature.

Which of the following is/are estimated by titrating polluted water with potassium dichromate solution in acidic medium?

A → P is a zero-order reaction. At 298 K, the rate constant of the reaction is $ 1 \times 10^{-3} $ mol L$^{-1}$ s$^{-1}$. Initial concentration of 'A' is 0.1 mol L$^{-1}$. What is the concentration of 'A' after 10 sec?

K_cfor the reaction \[ A(g) \rightleftharpoons T(K) + B(g) \] is 39.0. In a closed one-litre flask, one mole of $ A(g) $ was heated to $ T(K) $. What are the concentrations of $ A(g) $ and $ B(g) $ (in mol L$^{-1}$) respectively at equilibrium?

Hydrated sodium aluminum silicate is called:

Which of the following reactions is not a metal displacement reaction?

Two statements are given below
Statement I: Adsorption of a gas on the surface of charcoal is primarily an exothermic reaction
Statement II: A closed vessel contains O$_2$, H$_2$, Cl$_2$, NH$_3$ gases. Its pressure is P (atm). About 1 g of charcoal is added to this vessel and after some time its pressure was found to be less than P (atm)
The correct answer is

The atomic radius in pm of Mg, P, Si, Al respectively is:

At $T(K)$, the rms velocity of methane is $x \, {ms}^{-1}$. What is the kinetic energy (in J) of 8 g of methane at the same temperature
(Assume methane as an ideal gas)

The first ionization enthalpy (IE$_1$) and second ionization enthalpy (IE$_2$) of Mg(g) are 178 and 348 kcal mol$^{-1}$ respectively. The energy required for the reaction Mg(g) $\rightarrow$ Mg$^{2+}$(g) + 2e$^{-}$ (in kcal mol$^{-1}$) is:

At 27 °C, $x \, g$ of $ \text{CaCl}_2 $ was dissolved in 2.5 L of water. The osmotic pressure of the resultant solution is 0.82 atm. What is $x$ in grams? (Given $i = 2.5$, $R = 0.082 \, \text{L atm mol}^{-1} \text{K}^{-1}$)

In the reaction sequence, Y is: \[ CH_3CO_2H \xrightarrow{\text{(1) NH}_3, \text{(2)} \Delta} P \xrightarrow{\text{Br}_2/\text{NaOH}} Y \]

In which of the following cases, there is no change in hybridization of the central atom?

In the given structure of Diborane, $ \theta_1, \theta_2 $ are respectively:

The number of nucleophiles in the following list is: \[ CH_3NH_2, \quad CH_3CHO, \quad C_2H_4, \quad CH_3SH \]

Adsorption of a gas on a solid obeys the Freundlich adsorption isotherm. In the graph drawn between $\log (x/m)$ (on the y-axis) and $\log p$ (on the x-axis), the slope and intercept are found to be 1 and 0.3, respectively. If the initial pressure of the gas is 0.02 atm, the mass of the gas adsorbed per gram of solid is (${antilog } 0.3 = 2$).

At 293 K, the density of an aqueous solution containing 120 g of urea (NH$_2$CONH$_2$) per dm$^3$ is 1.02 kg dm$^{-3}$. The mole fraction of urea is approximately:

Which of the following sets are not correctly matched?
i. XeF₄ - sp³
ii. SF₄ - sp³d
iii. SO₃ - sp²
iv. SnCl₂ - sp

Which of the following amino acids possess two chiral centres?

Which sol is used as an intramuscular injection?

Identify the incorrect statement: