List of top Chemistry Questions

The following data were obtained during the first order thermal decomposition of a gas A at constant volume:\[\text{A(g)} \rightarrow 2\text{B(g)} + \text{C(g)}\]\[\begin{array}{|c|c|c|}\hline\text{S.No} & \text{Time/s} & \text{Total pressure/(atm)} \\\hline1 & 0 & 0.1 \\2 & 115 & 0.28 \\\hline\end{array}\]The rate constant of the reaction is _____ $\times 10^{-2}$ s$^{-1}$ (nearest integer).

Solubility of calcium phosphate (molecular mass, $ M $) in water is $ W_g $ per 100 mL at $ 25^\circ C $. Its solubility product at $ 25^\circ C $ will be approximately:

The strongest reducing agent amont the following is:

$[ \text{Co(NH}_3)_6 ]^{3+}$ and $[ \text{CoF}_6 ]^{3-}$ are respectively known as:

Which among the following has highest boiling point?

Match List - I with List - II

Choose the correct answer from the options given below :

Following Kjeldahl's method, 1g of organic compound released ammonia that neutralized 10 mL of 2M H$_2$SO$_4$. The percentage of nitrogen in the compound is _________.%.

Total number of isomeric compounds (including stereoisomers) formed by monochlorination of 2-methylbutane is________.

The functional group that shows negative resonance effect is:

Mass of ethylene glycol (antifreeze) to be added to 18.6 kg of water to protect the freezing point at $-24^\circ C$ is ____ kg (Molar mass in g mol$^{-1}$ for ethylene glycol = 62, $K_f$ of water = 1.86 K kg mol$^{-1}$).

Select the compound from the following that will show intramolecular hydrogen bonding.

Given below are two statements:
Statement (I): $ \text{SiO}_2 $ and $ \text{GeO}_2 $ are acidic while $ \text{SnO} $ and $ \text{PbO} $ are amphoteric in nature.
Statement (II): Allotropic forms of carbon are due to property of catenation and $ p\pi-d\pi $ bond formation.
In the light of the above statements, choose the most appropriate answer from the options given below:

The number of radial node/s for 3p orbital is:

Number of compounds which give reaction with Hinsberg's reagent is_______.

The amount of electricity in Coulomb required for the oxidation of 1 mol of $ \text{H}_2\text{O} $ to $ \text{O}_2 $ is \[\_ \times 10^5 \, \text{C}.\]

The set of meta directing functional groups from the following sets is:

Identify the amino acid which has:

The correct sequence of reactions involved in the following conversion is:

Match the following:

Given below are two statements:
Statement I: Viscosity of liquid decreases with an increase in temperature.
Statement II: The units of viscosity are kg m^-1 s^-2.

At 300 K, for the reaction A → P, the ∆Ssys is 5 J K^-1 mo^l-1. What is the heat absorbed (in kJ mol^-1) by the system?

At temperature $ T $ (K), the equilibrium constant $ K_c $ for the reaction: \[ A_2(g) \rightleftharpoons B_2(g) \] is 99.0. Two moles of $ A_2(g) $ were heated in a 1L closed flask to reach equilibrium. What are the equilibrium concentrations (in $ mol \ L^{-1} $) of $ A_2(g) $ and $ B_2(g) $?

Lithium forms an alloy with ‘X’. This alloy is used to make armor plates. What is ‘X’?

Match the following bond enthalpies with their respective bonds:

The concentration of 1L of $ CaCO_3 $ solution is 1000 ppm. What is its concentration in mol $ L^{-1} $?
(Ca = 40 u, O = 16 u, C = 12 u)