List of top Chemistry Questions

The group number of the element in the periodic table with the electronic configuration $(n - 1)d^2 ns^2$. For $n = 4$ is:

Match the items in Column I with their description in Column II:

Choose the incorrect statement.

Which one of the following will give a positive result when it is warmed with Chloroform and alcoholic solution of KOH?

Identify the final product formed during the course of the given reactions.
% Reaction given Pentan-2-one $\xrightarrow{\text{NaCN/HCl}} [X] \xrightarrow{\Delta, 95% H_2SO_4} [Y]$

A proton having mass equal to $1.66 \times 10^{-27}$ kg is accelerated to one tenth of the velocity of light. If its velocity can be measured to an accuracy of $\pm 2%$, what would be the uncertainty in its position?

The conversion of Propyne to Benzene can be brought out in 4 steps.
Choose the reagents to be used, in the proper sequential order, to bring out the conversion.

Identify the reagents X, Y and Z used to bring out the following reactions.

Para and ortho hydrogen differ in:

For a reaction of the type, $ 2X + Y \rightarrow A + B $, the following is the data collected:

If electrolysis of water is carried out for a time duration of 2 hours, how much electric current in amperes would be required to liberate 100 ml of O$_2$ gas measured under standard conditions of temperature and pressure?

From among the following, identify the compound which forms two moles of a ketone on ozonolysis.

Select the strongest base from the given compounds:

In neutral medium KMnO$_4$ oxidises MnSO$_4$ to __________

Match the following characteristics of transition metals given in Column I with the examples listed in Column II:

Gaseous Nitrous oxide decomposes at 298 K to form Nitrogen gas and Oxygen gas. The $\Delta H \text{ for the reaction at 1.0 atm pressure and 298 K is } $-163.15 $\text{ kJ}$. Calculate Internal energy change for the decomposition of 100 g of Nitrous oxide gas under the same conditions of temperature and pressure.

Which one of the following compounds would not undergo Aldol condensation?

5.8 g of a gas maintained at 95$^\circ C$ occupies the same volume as 0.368 g of hydrogen gas maintained at a temperature of 17$^\circ C$ and pressure being the same atmospheric pressure for both the gases. What is the molecular mass of the unknown gas?

A first order reaction proceeds to 90% completion. What will be the approximate time taken for 90% completion in relation to $t_{1/2}$ of the reaction?

Identify the starting compound from the following data: \[ C_6H_{14}O(X) \text{ on reaction with HI yields a haloalkane (A) and an alcohol (B).} \] Compound (A) on reaction with aqueous NaOH gives an alcohol (C). Compounds (B) and (C) on reaction with CrO$_3$ in anhydrous medium yields Butanone and Ethanal respectively.

The total number of sp2 hybridised carbon atoms in the major product P (a non-heterocyclic compound) of the following reaction is ___.

Match the reactions (in the given stoichiometry of the reactants) in List-I with one of their products given in List-II and choose the correct option.

	List-I		List-II
(P)	P₂O₃ + 3H₂O →	(1)	P(O)(OCH₃)Cl₂
(Q)	P₄ + 3NaOH + 3H₂O →	(2)	H₃PO₃
(R)	PCl₅ + CH₃COOH →	(3)	PH₃
(S)	H₃PO₂ + 2H₂O + 4AgNO₃ →	(4)	POCl₃
		(5)	H₃PO₄

The major products obtained from the reactions in List-II are the reactants for the named reactions mentioned in List-I. Match List-I with List-II and choose the correct option.

In the following reactions, P, Q, R, and S are the major products.

The correct statement(s) about P, Q, R, and S is(are)

One mole of an ideal monoatomic gas undergoes two reversible processes ($A → B$ and $B → C$) as shown in the given figure:

$A → B$ is an adiabatic process. If the total heat absorbed in the entire process ($A → B$ and $B → C$) is $R𝑇_2\ ln\ 10$, the value of $2 log\ 𝑉_3$ is ___ . [Use, molar heat capacity of the gas at constant pressure, $𝐶_{p,m} = \frac 52R$]