List of top Chemistry Questions

One mole of an alkene on ozonolysis gives one mole of propanal and one mole of pent-3-one. The alkene is

The number of possible structural isomers of $C_3H_6Cl_2$ are

Match the following:} Compound \hspace{2cm} Use} (a) Methylene chloride \hspace{0.8cm} (i) Solvent for iodine} (b) Chloroform \hspace{1.8cm} (ii) Manufacture of propellents} (c) Iodoform \hspace{2cm} (iii) Metal cleaning} (d) Carbon tetrachloride \hspace{0.6cm} (iv) Antiseptic

The technique used to purify liquids having very high boiling points and decompose at or below their boiling point is

Which of the following metal is incorporated into the electrodes of fuel cell to increase the rate of reaction?

IUPAC name of $[CoCl_2(en)_2]Cl$ is

$3$ g of benzoic acid dissolved in $25$ g of benzene shows a depression in freezing point equal to $2.5$ K. What is the experimental molar mass of benzoic acid in benzene? \ (Molal depression constant for benzene is $5$ K kg mol$^{-1}$)

A reaction is third order with respect to a reactant. If the concentration of the reactant is doubled, the rate of reaction increased by

The rate constant of a reaction at $400$ K and $500$ K are $0.04$ min$^{-1}$ and $0.08$ min$^{-1}$ respectively. The activation energy of the reaction is about \ ($2.303R=19$ J K$^{-1}$ mol$^{-1}$, $\log 2 = 0.3010$)

The correct order of standard electrode potentials of the following transition elements is

The $\Delta G^\circ$ for the reaction $3X(g)+2Y(g)\rightarrow3Z(g)$ at $298K$ is ($\Delta H^\circ=-13$ kJ mol$^{-1}$ and $\Delta S^\circ=-45$ J K$^{-1}$ mol$^{-1}$)

For the equilibrium, $2A(g)\rightleftharpoons 2B(g)+C(g)$, the value of the equilibrium constant $K_p$ is $0.1662$ atm at $1000$ K. The value of $K_c$ for the equilibrium at the same temperature is $(R=0.0831$ L atm mol$^{-1}$ K$^{-1})$

$CO_2$ is taken in a closed container at $1500$ K and at a pressure of $0.6$ bar. When a certain amount of carbon is added to the system at equilibrium some of $CO_2$ is converted into $CO$ and the equilibrium pressure is $0.9$ bar. What is the $K_p$ value at $1500$ K for the equilibrium $CO_2(g)+C(s)\rightleftharpoons2CO(g)$?

In the reaction $O_2(g)+4H^+(aq)+4e^- \rightarrow 2H_2O(l)$, the quantity of electricity needed to reduce one mole of gaseous oxygen is $(E^\circ_{cell}=1.23V)$

Which of the following molecule has double bond with two $\pi$ bonds?

The quantity of heat necessary to raise the temperature of $60$ g of metal X from $30^\circ C$ to $54^\circ C$ is (Molar heat capacity of metal X = $25$ J mol$^{-1}$ K$^{-1}$ and molar mass = $30$ g mol$^{-1}$)

Which of the following statements are incorrect about boundary surface diagram of orbital?} (i) A boundary surface is drawn in space for an orbital on which the value of probability density $|\Psi|^2$ is constant.} (ii) The boundary surface for $|\Psi|^2$ and $|\Psi|$ are not identical.} (iii) The density of the dots represents the probability density of finding the electron in the region.} (iv) In $1s$ and $2s$ orbitals, the probability of finding electron at a given distance is not equal in all the directions.} (v) The $2p$ orbitals in the boundary surface diagram are not spherical.

The correct increasing order of number of electrons around the central atom in the following molecules is

The correct order of metallic radius of the elements is

The mass of sodium acetate required to prepare $250$ mL of $0.4$ M aqueous solution is \ (Molar mass of sodium acetate = $82$ g mol$^{-1}$)

Which of the following ions are isoelectronic?

Which of the following statements are incorrect about boundary surface diagram of orbital?} (i) A boundary surface is drawn in space for an orbital on which the value of probability density $|\Psi|^2$ is constant.} (ii) The boundary surface for $|\Psi|^2$ and $|\Psi|$ are not identical.} (iii) The density of the dots represents the probability density of finding the electron in the region.} (iv) In $1s$ and $2s$ orbitals, the probability of finding electron at a given distance is not equal in all the directions.} (v) The $2p$ orbitals in the boundary surface diagram are not spherical.

The mass of sodium acetate required to prepare $250$ mL of $0.4$ M aqueous solution is \ (Molar mass of sodium acetate = $82$ g mol$^{-1}$)

What is the oxidation state of Chlorine in \(Cl_2O_7\)?

Pyridinium chlorochromate is a complex of