NEET (UG) Solved Papers Portal
Practice authentic previous years' questions for Physics, Chemistry, Botany, and Zoology with step-by-step NCERT-aligned solutions and full-width diagram references.
All NEET UG Papers / All Subjects / All Chapters
Marking pattern: +4.00 positive, -1.00 negative (Official NTA NEET Scheme).
The correct statement with regard to the secondary structure of DNA/RNA is
The pair of molecules that are metamers among the following is:
Match List I with List II:
| List-I (Complex) | List-II (Type of isomerism) |
|---|---|
| A. [Pt(NH₃)₂Cl₂] | I. Geometrical |
| B. [Co(en)₃]³⁺ | II. Solvate |
| C. [Co(NH₃)₅NO₂]Cl₂ | III. Optical |
| D. [Cr(H₂O)₆]Cl₃ | IV. Linkage |
Choose the correct answer from the options given below:
Match List I with List II:
| List-I (Order of reaction) | List-II (Unit of rate constant) |
|---|---|
| A. Zero order | I. mol⁻¹ L s⁻¹ |
| B. First order | II. mol⁻² L² s⁻¹ |
| C. Second order | III. s⁻¹ |
| D. Third order | IV. mol L⁻¹ s⁻¹ |
Choose the correct answer from the options given below :
The correct IUPAC name of the following compound is:
$$\text{CH}_3-\text{CH}_2-\text{CH}(\text{CH}_2\text{CH}_3)-\text{CH}_2-\text{CH}(\text{CH}_3)-\text{CH}_2-\text{CH}_3$$
A bulb is rated at 150 watt, converting 8% energy into light. If energy of one photon is 4.42 × 10⁻¹⁹ J, how many photons are emitted by the bulb per second?
Methane reacts with steam at 1273 K in the presence of nickel catalyst to form
Compound P (C₈H₈O) gives a red orange precipitate with 2,4-DNP reagent and it does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic product Q that produces effervescence on treating with aq. NaHCO₃. Compounds P and Q, respectively, are:
Match List I with List II:
| List I | List II |
|---|---|
| A. C₂H₄ | I. 3 σ bonds, 2 π bonds |
| B. C₂H₂ | II. 3 σ bonds, one lone pair |
| C. CH₄ | III. 4 σ bonds |
| D. NH₃ | IV. 5 σ bonds, 1 π bond |
Choose the correct answer from the options given below :
The following two reactions give the same foul smelling product Z.
$$\text{C}_2\text{H}_5\text{Cl} \xrightarrow{\text{X}} \text{Z}$$
$$\text{C}_2\text{H}_5\text{CONH}_2 \xrightarrow{\text{Br}_2, \text{ NaOH}} \text{Y} \xrightarrow{\text{CHCl}_3 / \text{ethanolic KOH}, \Delta} \text{Z}$$
X and Z, respectively, are:
The number of hydrogen atoms present in 5.4 g of urea is:
(Given: Molar mass of urea: 60 g mol⁻¹, Nₐ: 6.022 × 10²³ particles mol⁻¹)
Identify the incorrect statement from the following:
Which one of the following is an ambidentate ligand?
The correct order of increasing metallic character of Na, Be, P, Mg and Si is
Match List I with List II:
| List I | List II |
|---|---|
| A. H₃C-CH(CH₃)-C₆H₅ → C₆H₅OH | I. (i) Oleum; (ii) NaOH, Δ; (iii) H⁺ |
| B. CH₃COOH → CH₃CH₂OH | II. (i) O₂; (ii) H₂O / H⁺ |
| C. CH₃CH₂CH₂OH → CH₃-CH(OH)-CH₃ | III. (i) CH₃OH, H⁺; (ii) H₂, catalyst |
| D. C₆H₆ → C₆H₅OH | IV. (i) conc. H₂SO₄, Δ; (ii) H⁺ / H₂O |
Choose the correct answer from the options given below:
Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:
In the following reaction sequence, X and Z respectively are:
$$\text{CH}_3\text{CH}_2\text{CH}_2-\text{OH} + \text{PCl}_5 \longrightarrow \text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} + \text{X} + \text{HCl}$$
$$\text{CH}_3\text{CH}_2\text{CH}_2\text{Cl} \xrightarrow[\Delta]{\text{alc. KOH}} \text{Y} \xrightarrow[(\text{C}_6\text{H}_5\text{CO})_2\text{O}_2]{\text{HBr}} \text{Z}$$
Match List I with List II:
| List I (Complex/ion) | List II (Shape/geometry) |
|---|---|
| A. [Pt(Cl)₂(NH₃)₂] | I. Octahedral |
| B. [Co(NH₃)₆]Cl₃ | II. Trigonal bipyramidal |
| C. [NiCl₄]²⁻ | III. Square planar |
| D. [Fe(CO)₅] | IV. Tetrahedral |
Choose the correct answer from the options given below:
The functional group that can be identified through phthalein dye test is:
Two products X and Y are formed in the following reaction sequence:
$$\text{C}_6\text{H}_6 + \text{CH}_3\text{Cl} \xrightarrow{\text{Anhyd. AlCl}_3} \text{W} \xrightarrow{\text{dil. HNO}_3 + \text{dil. H}_2\text{SO}_4, \text{ warm}} \text{X} + \text{Y}$$
The suitable method that can be used for the separation of products X and Y is:
Identify the correct statements:
(A) The molality of 2.5 g of ethanoic acid (Molar mass: 60 g mol⁻¹) in 75 g of benzene solution is 0.556 m.
(B) The molarity of a solution containing 5 g of NaOH (molar mass: 40 g mol⁻¹) in 450 mL of solution is 0.278 M at 298 K.
(C) Aquatic species are more comfortable in cold water.
(D) The solubility of gas increases with decrease in pressure.
(E) For a binary mixture of A and B, the number of moles of A and B are n_A and n_B respectively. The mole fraction of B will be x_B = n_A / (n_A + n_B).
Choose the correct answer from the options given below:
During Lassaigne's test, the elements present in an organic compound are converted from:
A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is :
(Given: Molar mass of Cu = 63 g mol⁻¹, 1 F = 96487 C mol⁻¹)
At a certain temperature, T (K), during a process, 500 J is absorbed by the system and work of 200 J is done by the system. Then change in internal energy of the system is:
For a certain reaction R → Product, the plot of concentration [R] vs time has a negative slope as shown.
The order of reaction is: