List of top Chemistry Questions asked in JEE Main

Given below are two statements:
Statement (I): NaCl is added to the ice at \( 0^\circ C \), present in the ice cream box to prevent the melting of ice cream.
Statement (II): On addition of NaCl to ice at \( 0^\circ C \), there is a depression in freezing point.
In the light of the above statements, choose the correct answer from the options given below:

Match List - I with List - II. List - I (Partial Derivatives) \(and\) List - II (Thermodynamic Quantity)

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

Arrange the following compounds in increasing order of their dipole moment:
HBr, H\(_2\)S, NF\(_3\), and CCl\(_3\)

The compound with molecular formula C\(_6\)H\(_6\), which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has \(\_\_\_\_\_\)\( \pi \) electrons. 

Given below are two statements: 
Statement (I): A spectral line will be observed for a 2p\(_x\) \(\rightarrow\) 2p\(_y\) transition.
Statement (II): 2p\(_x\) and 2p\(_y\) are degenerate orbitals.
In the light of the above statements, choose the correct answer from the options given below:

20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is \(\_\_\_\_\_\) x \(10^{-2}\)M. (Nearest integer) 

Structure of residue (A) and compound (B) formed respectively is:

Consider the following cases of standard enthalpy of reaction (\( \Delta H_f^\circ \) in kJ mol\(^{-1}\)): \[ \text{C}_2\text{H}_6(g) + 7 \text{O}_2(g) \rightarrow 2 \text{CO}_2(g) + 3 \text{H}_2\text{O}(l) \quad \Delta H_1^\circ = -1550 \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}_2(g) \quad \Delta H_2^\circ = -393.5 \] \[ \text{H}_2(g) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{H}_2\text{O}(g) \quad \Delta H_3^\circ = -286 \] The magnitude of \( \Delta H_f^\circ \) of \( \text{C}_2\text{H}_6(g) \) is \(\_\_\_\_\_\) kJ mol\(^{-1}\) (Nearest integer). 

The complex of \( Ni^{2+}\) ion and dimethyl glyoxime contains \(\_\_\_\_\_\) number of Hydrogen (H) atoms. 

Identify the homoleptic complex(es) that is/are low spin.
[(A)] \([\text{Fe(CN)}_5\text{NO}]^{2-}\)
[(B)] \([\text{CoF}_6]^{3-}\)
[(C)] \([\text{Fe(CN)}_6]^{4-}\)
[(D)] \([\text{Co(NH}_3)_6]^{3+}\)
[(E)] \([\text{Cr(H}_2\text{O)}_6]^{2+}\)
Choose the correct answer from the options given below:

Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde. 

Given below are two statements: 
Statement (I): Nitrogen, sulphur, halogen, and phosphorus present in an organic compound are detected by Lassaigne's Test.
Statement (II): The elements present in the compound are converted from covalent form into ionic form by fusing the compound with Magnesium in Lassaigne's test. 
In the light of the above statements, choose the correct answer from the options given below: