NEET 2025 | NEET Year Wise Previous Years Questions

Biology

Chemistry

1. Identify the suitable reagent for the following conversion. 2. The correct order of decreasing acidity of the following aliphatic acids is 3. Which one of the following reactions does NOT belong to "Lassaigne's test"? 4. If the rate constant of a reaction is $0.03 \mathrm{~s}^{-1}$, how much time does it take for $7.2 \mathrm{~mol} \mathrm 5. Given below are two statements : Statement I: A hypothetical diatomic molecule with bond order zero is quite stable. S 6. Out of the following complex compounds, which of the compound will be having the minimum conductance solution? 7. Which of the following aqueous solution will exhibit highest boiling point? 8. Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) 9. Consider the following compounds : ${\mathrm{K\underline{O}}}_2, \mathrm{H}_2 \underline{\mathrm{O}}_2$ and $\mathrm{H}_ 10. Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style 11. Given below are two statements : Statement I: Like nitrogen that can form ammonia, arsenic can form arsine. Statement II 12. Given below are two statements : Statement I: Ferromagnetism is considered as an extreme form of paramagnetism. Statemen 13. Which one of the following reactions does NOT give benzene as the product? 14. Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli 15. How many products (including stereoisomers) are expected from monochlorination of the following compound? 16. Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting p 17. The standard heat of formation, in $\mathrm{kcal} / \mathrm{mol}$ of $\mathrm{Ba}^{2+}$ is : [Given : standard heat of f 18. Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli 19. $\mathrm{C}(\mathrm{s})+2 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{CH}_4(\mathrm{~g}) ; \Delta \mathrm{H}=-74.8 \ma 20. Sugar ' $X$ ' A. is found in honey B. is a keto sugar C. exists in $\alpha$ and $\beta$-anomeric forms. D. Is laevorotat 21. Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula $\math 22. For the reaction $\mathrm{A}(\mathrm{g}) \rightleftharpoons 2 \mathrm{~B}(\mathrm{~g})$, the backward reaction rate cons 23. The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes $n=2 \rightarrow n=3$ and $n=4 \ 24. If the molar conductivity $\left(\Lambda_{\mathrm{m}}\right)$ of a $0.050 \mathrm{~mol} \mathrm{~L}^{-1}$ solution of a 25. 5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures o 26. Among the following, choose the ones with equal number of atoms. A. 212 g of $\mathrm{Na}_2 \mathrm{CO}_3(\mathrm{~s})$ 27. Which of the following are paramagnetic? A. $\left[\mathrm{NiCl}_4\right]^{2-}$ B. $\mathrm{Ni}(\mathrm{CO})_4$ C. $\lef 28. If the half-life ( $t_{1 / 2}$ ) for a first order reaction is 1 minute, then the time required for $99.9 \%$ completion 29. Energy and radius of first Bohr orbit of $\mathrm{He}^{+}$and $\mathrm{Li}^{2+}$ are [Given $\mathrm{R}_{\mathrm{H}}=2.1 30. Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is : 31. Dalton's Atomic theory could not explain which of the following? 32. Identify the correct orders against the property mentioned A. $\mathrm{H}_2 \mathrm{O}>\mathrm{NH}_3>\mathrm{CHCl}_3$-di 33. Match List-I with List-II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:sol 34. The correct order of decreasing basic strength of the given amines is: Answer (1) Sol. Lower is the value of $\mathrm{p 35. The correct order of the wavelength of light absorbed by the following complexes is, A. $\left[\mathrm{Co}\left(\mathrm{ 36. Which one of the following compounds does not decolourize bromine water? 37. Predict the major product ' $P$ ' in the following sequence of reactions- 38. Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli 39. Which among the following electronic configurations belong to main group elements? A. $[\mathrm{Ne}] 3 \mathrm{~s}^1$ B. 40. Which one of the following compounds can exist as cis-trans isomers? 41. Phosphoric acid ionizes in three steps with their ionization constant values $K_{a_1}, K_{a_2}$ and $K_{a_3}$, respectiv 42. Match List-I with List-II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:soli 43. Higher yield of NO in $\mathrm{N}_2(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}(\mathrm{g})$ 44. Given below are two statements : Statement-I : Benzenediazonium salt is prepared by the reaction of aniline with nitrous 45. The major product of the following reaction is

Physics

1. A parallel plate capacitor made of circular plates is being charged such that the surface charge density on its plates i 2. An electric dipole with dipole moment $5 \times 10^{-6} \mathrm{Cm}$ is aligned with the direction of a uniform electric 3. A ball of mass 0.5 kg is dropped from a height of 40 m . The ball hits the ground and rises to a height of 10 m . The im 4. The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from th 5. The kinetic energies of two similar cars $A$ and $B$ are 100 J and 225 J respectively. On applying breaks, car $A$ stops 6. The current passing through the battery in the given circuit, is: 7. Three identical heat conducting rods are connected in series as shown in the figure. The rods on the sides have thermal 8. In an oscillating spring mass system, a spring is connected to a box filled with sand. As the box oscillates, sand leaks 9. $A B$ is a part of an electrical circuit (see figure). The potential difference " $V_A-V_B$ ", at the instant when curre 10. A particle of mass $m$ is moving around the origin with a constant force $F$ pulling it towards the origin. If Bohr mode 11. In some appropriate units, time $(t)$ and position $(x)$ relation of a moving particle is given by $t=x^2+x$. The accele 12. A model for quantized motion of an electron in a uniform magnetic field $B$ states that the flux passing through the orb 13. A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the 14. There are two inclined surfaces of equal length $(L)$ and same angle of inclination $45^{\circ}$ with the horizontal. On 15. A full wave rectifier circuit with diodes $\left(D_1\right)$ and $\left(D_2\right)$ is shown in the figure. If input sup 16. A uniform rod of mass 20 kg and length 5 m leans against a smooth vertical wall making an angle of $60^{\circ}$ with it. 17. Two identical charged conducting spheres $A$ and $B$ have their centres separated by a certain distance. Charge on each 18. Two cities $X$ and $Y$ are connected by a regular bus service with a bus leaving in either direction every $T$ min. A gi 19. A container has two chambers of volumes $V_1=2$ litres and $V_2=3$ litres separated by a partition made of a thermal ins 20. De-Broglie wavelength of an electron orbiting in the $n=2$ state of hydrogen atom is close to (Given Bohr radius $=0.052 21. To an ac power supply of 220 V at 50 Hz , a resistor of $20 \Omega$, a capacitor of reactance $25 \Omega$ and an inducto 22. Which of the following options represent the variation of photoelectric current with property of light shown on the x-ax 23. A pipe open at both ends has a fundamental frequency $f$ in air. The pipe is now dipped vertically in a water drum to h 24. Two identical point masses $P$ and $Q$, suspended from two separate massless springs of spring constants $k_1$ and $k_2$ 25. The output ( $Y$ ) of the given logic implementation is similar to the output of an/a ________ gate. 26. An oxygen cylinder of volume 30 litre has 18.20 moles of oxygen. After some oxygen is withdrawn from the cylinder, its g 27. In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of 28. Two gases $A$ and $B$ are filled at the same pressure in separate cylinders with movable pistons of radius $r_A$ and $r_ 29. A balloon is made of a material of surface tension $S$ and its inflation outlet (from where gas is filled in it) has sma 30. A bob of heavy mass $m$ is suspended by a light string of length $/$. The bob is given a horizontal velocity $v_0$ as sh 31. A physical quantity $P$ is related to four observations $a, b, c$ and $d$ as follows: $$P=a^3 b^2 / c \sqrt{d}$$ The per 32. The Sun rotates around its centre once in 27 days. What will be the period of revolution if the Sun were to expand to tw 33. The radius of Martian orbit around the Sun is about 4 times the radius of the orbit of Mercury. The Martian year is 687 34. A wire of resistance $R$ is cut into 8 equal pieces. From these pieces two equivalent resistances are made by adding fou 35. A photon and an electron (mass $m$ ) have the same energy $E$. The ratio ( $\lambda_{\text {photon }} / \lambda_{\text { 36. A sphere of radius $R$ is cut from a larger solid sphere of radius $2 R$ as shown in the figure. The ratio of the moment 37. An electron (mass $9 \times 10^{-31} \mathrm{~kg}$ and charge $1.6 \times 10^{-19} \mathrm{C}$ ) moving with speed $c / 38. The electric field in a plane electromagnetic wave is given by $$ E_z=60 \cos \left(5 x+1.5 \times 10^9 t\right) \mathrm 39. A body weighs 48 N on the surface of the earth. The gravitational force experienced by the body due to the earth at a he 40. An unpolarized light beam travelling in air is incident on a medium of refractive index 1.73 at Brewster's angle. Then 41. A constant voltage of 50 V is maintained between the points $A$ and $B$ of the circuit shown in the figure. The current 42. The plates of a parallel plate capacitor are separated by $d$. Two slabs of different dielectric constant $K_1$ and $K_2 43. Consider the diameter of a spherical object being measured with the help of a Vernier callipers. Suppose its 10 Vernier 44. A 2 amp current is flowing through two different small circular copper coils having radii ratio $1: 2$. The ratio of the 45. Consider a water tank shown in the figure. It has one wall at $x=L$ and can be taken to be very wide in the $z$ directio

NEET 2025

MCQ (Single Correct Answer)

-1

If the half-life ( $t_{1 / 2}$ ) for a first order reaction is 1 minute, then the time required for $99.9 \%$ completion of the reaction is closest to :

5 minutes

10 minutes

2 minutes

4 minutes

NEET 2025

MCQ (Single Correct Answer)

-1

Energy and radius of first Bohr orbit of $\mathrm{He}^{+}$and $\mathrm{Li}^{2+}$ are [Given $\mathrm{R}_{\mathrm{H}}=2.18 \times 10^{-18} \mathrm{~J}, \mathrm{a}_0=52.9 \mathrm{pm}$ ]

$$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}$$

$$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-16} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned}$$

$$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-19.62 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=17.6 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-8.72 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=26.4 \mathrm{pm} \end{aligned}$$

$$\begin{aligned} & \mathrm{E}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=-8.72 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{Li}^{2+}\right)=26.4 \mathrm{pm} \\ & \mathrm{E}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=-19.62 \times 10^{-18} \mathrm{~J} ; \\ & \mathrm{r}_{\mathrm{n}}\left(\mathrm{He}^{+}\right)=17.6 \mathrm{pm} \end{aligned}$$

NEET 2025

MCQ (Single Correct Answer)

-1

Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :

NEET 2025 Chemistry - Some Basic Concepts of Organic Chemistry Question 2 English

III $>$ II $>$ I

II $>$ III $>$ I

II $>$ I $>$ III

I $>$ II $>$ III

NEET 2025

MCQ (Single Correct Answer)

-1

Dalton's Atomic theory could not explain which of the following?

Law of multiple proportion

Law of gaseous volume

Law of conservation of mass

Law of constant proportion

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