List of top Chemistry Questions

Match the Compounds (List- I) with the appropriate Catalyst/Reagents (List- II) for their reduction into corresponding amines.

The most stable carbocation from the following is:

Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is ….. (Nearest integer).

A group 15 element forms $ d\pi - d\pi $ bond with transition metals. It also forms a hydride, which is the strongest base among the hydrides of other group members that form $ d\pi - d\pi $ bonds. The atomic number of the element is …….

Total number of molecules/species from the following which will be paramagnetic is ………. \[ O_2, O_2^+, O_2^-, NO, NO_2, CO, K_2[NiCl_4], [Co(NH_3)_6]Cl_3, K_2[Ni(CN)_4] \]

Consider the following data:
- Heat of formation of $ CO_2(g) $ = -393.5 kJ mol$^{-1}$
- Heat of formation of $ H_2O(l) $ = -286.0 kJ mol$^{-1}$
- Heat of combustion of benzene = -3267.0 kJ mol$^{-1}$
The heat of formation of benzene is ……… kJ mol$^{-1}$ (Nearest integer).

The spin-only magnetic moment ($\mu$) value (B.M.) of the compound with the strongest oxidising power among $Mn_2O_3$, $TiO$, and $VO$ is ……. B.M. (Nearest integer).

Concentrated nitric acid is labelled as 75% by mass. The volume in mL of the solution which contains 30 g of nitric acid is:
Given: Density of nitric acid solution is 1.25 g/mL.

Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom?
(A) $ 1s<2s<2p<3d<4s $
(B) $ 1s<2s = 2p<3s = 3p $
(C) $ 1s<2s<2p<3s<3p $
(D) $ 1s<2s<4s<3d $
Choose the correct answer from the options given below:

Match List - I with List - II.
List - I (Saccharides)     List - II (Glycosidic linkages found)
(A) Sucrose     (I) $ \alpha 1 - 4 $
(B) Maltose     (II) $ \alpha 1 - 4 $ and $ \alpha 1 - 6 $
(C) Lactose     (III) $ \alpha 1 - \beta 2 $
(D) Amylopectin     (IV) $ \beta 1 - 4 $

Choose the correct answer from the options given below:

An ideal gas undergoes a cyclic transformation starting from point A and coming back to the same point by tracing the path A→B→C→D→A as shown in the three cases below.

Choose the correct option regarding $\Delta U$:

Match List - I with List - II.

List - I (Complex)	List - II (Hybridisation)
(A) $[\text{CoF}_6]^{3-}$	(I) $ d^2 sp^3 $
(B) $[\text{NiCl}_4]^{2-}$	(II) $ sp^3 $
(C) $[\text{Co(NH}_3)_6]^{3+}$	(III) $ sp^3 d^2 $
(D) $[\text{Ni(CN}_4]^{2-}$	(IV) $ dsp^2 $

Choose the correct answer from the options given below:

Identify correct conversion during acidic hydrolysis from the following:
(A) Starch gives galactose.
(B) Cane sugar gives equal amount of glucose and fructose.
(C) Milk sugar gives glucose and galactose.
(D) Amylopectin gives glucose and fructose.
(E) Amylose gives only glucose.
Choose the correct answer from the options given below:

Given below are two statements:
Statement (I): According to the Law of Octaves, the elements were arranged in the increasing order of their atomic number.
Statement (II): Meyer observed a periodically repeated pattern upon plotting physical properties of certain elements against their respective atomic numbers.
In the light of the above statements, Choose the correct answer from the options given below:

Consider a complex reaction taking place in three steps with rate constants $k_1$, $k_2$, and $k_3$ respectively. The overall rate constant $k$ is given by the expression $ k = \sqrt{\frac{k_1 k_3}{k_2}} $. If the activation energies of the three steps are 60, 30, and 10 kJ mol$^{-1}$ respectively, then the overall energy of activation in kJ mol$^{-1}$ is $\_\_\_\_$(Nearest integer).

The hydrocarbon (X) with molar mass 80 g mol$^{-1}$ and 90% carbon has $\_\_\_\_$ degree of unsaturation.

The possible number of stereoisomers for 5-phenylpent-4-en-2-ol is:

The observed and normal molar masses of compound MX$_2$ are 65.6 and 164 respectively. The percent degree of ionisation of MX$_2$ is $\_\_\_\_$% (Nearest integer).

In Carius method of estimation of halogen, 0.25 g of an organic compound gave 0.15 g of silver bromide (AgBr). The percentage of Bromine in the organic compound is $\_\_\_\_$times 10^{-1}% (Nearest integer). (Given: Molar mass of Ag is 108 and Br is 80 g mol^{-1}

Match List - I with List - II.

\[ \begin{array}{|c|c|} \hline \text{List - I} & \text{List - II} \\ \hline \text{(A) } \text{Ti}^{3+} & \text{(I) } 3.87 \\ \text{(B) } \text{V}^{2+} & \text{(II) } 0.00 \\ \text{(C) } \text{Ni}^{2+} & \text{(III) } 1.73 \\ \text{(D) } \text{Sc}^{3+} & \text{(IV) } 2.84 \\ \hline \end{array} \]

The structure of the major product formed in the following reaction is:

For the reaction, $H_2(g) + I_2(g) \rightleftharpoons 2HI(g)$

Attainment of equilibrium is predicted correctly by:

The conditions and consequences that favour the $ t_{2g}^3 e_g^1 $ configuration in a metal complex are:

The successive 5 ionisation energies of an element are 800, 2427, 3658, 25024 and 32824 kJ/mol, respectively. By using the above values, predict the group in which the above element is present:

Given below are two statements:

In light of the above statements, choose the correct answer from the options given below:

List - I (Complex)	List - II (Hybridisation)
(A) \([\text{CoF}_6]^{3-}\)	(I) \( d^2 sp^3 \)
(B) \([\text{NiCl}_4]^{2-}\)	(II) \( sp^3 \)
(C) \([\text{Co(NH}_3)_6]^{3+}\)	(III) \( sp^3 d^2 \)
(D) \([\text{Ni(CN}_4]^{2-}\)	(IV) \( dsp^2 \)