NEET WEEKLY TEST CHEMISTRY (22.08.2026)

5. A beam of Helium Atoms moves with a velocity of 2.0 X 10³ m/s. Find the wavelength of the particle constituting the beam.

6. Which of the following compound is optically active?

1. 1- butanol
2. 2-butanol    
3. 3-butanol
4. 4-heptanol

7. What is the value of angular momentum for an electron in the 5^th orbit according to Bohr’s theory?

1. 3h/2π
2. 5h/2π
3. h/2π
4. 5h/3π

8. The places that were left empty by Mendeleev in periodic table were for

1. aluminium and silicon
2. gallium and germanium
3. arsenic and antimony
4. molybdenum and tungsten

9. What type of hybrid orbitals will form in the following compound: H₂C-CH=CH-CH₂-CH₃?

1. sp and sp³
2. sp and sp²
3. sp² and sp³
4. only sp³

10. A spectrum which consists of bright coloured lines separated by dark spaces is known as

1. Visible spectrum
2. Emission spectrum
3. Absorption spectrum
4. Electromagnetic spectrum

11. Which of the following compound is meso isomer?

1. 2-chloro butane
2. 2,3 – dichloro butane
3. 2,3 dichloropentane
4. 2- Hydroxypropanoic acid

12. Find out the number of waves made by a Bohr electron electron in one complete revolution in its 3^rd

1. 1
2. 2
3. 3
4. 4

13. The number of sigma bonds, pi bonds and lone pair of electrons in Furan, respectively are

1. 10, 2, 1
2. 9, 2, 2
3. 9,2,0
4. 5,2,0

14. The successive ionization enthalpy of an element in kJmol^-1 is
I.E₁ – 899.5    I. E₂ – 1757.1   
I.E₃ – 14,848.7
The element is

1. Lithium
2. Beryllium
3. Boron
4. Carbon

15. The number of structural isomers of C₆H₁₄ is

1. 3
2. 5
3. 4
4. 6

16. Calculate the radius of Bohr’s fifth orbit (in nm) for Hydrogen atom.

1. 1322.5
2. 13.225
3. 1.3225
4. 0.1322

17. Assertion (A): The atomic radius of Gallium is smaller than that of Aluminium.
     Reason (R): The valence electrons in Gallium experience a weaker effective nuclear charge due to the excellent shielding effect of the inner 3d-electrons.
Choose the correct option from the choices given below:

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false.
4. (A) is false but (R) is true

18. Number of stereo centers/ chiral centre present in linear and cyclic structures of glucose are respectively:

1. 5 & 4
2. 4 & 4
3. 5 & 5
4. 4 & 5

19. The incorrect option for cathode ray is

1. Cathode ray travel in a straight line
2. It cannot produce mechanical effect
3. Do not depend upon the nature of gas
4. Charge/Mass ratio is 1.76 X 10¹¹ C/kg

20. Which of the following is correct with respect to – I effect of the substituents?

1. NH₂>-OR >-F
2. NR₂<-OR < -F
3. NH₂<-OR <-F
4. NR₃ >-OR>-F

21. Predict the period, group and block to which an element with Z = 33 belongs.

1. 3^rd period, group 5, d-block
2. 4^th period, group 5, d-block
3. 4^th period, group 15, p-block
4. 3^rd period, group 15, p-block

22. The correct IUPACT name of the following compound is

1. 4-Methyl-5-Chloro-nitrobenzene
2. 2-Chloro-1-methyl-4-nitrobenzene
3. 1-Chloro-2-methyl-5-nitrobenzene
4. 1-Methyl-2-chloro-4-nitrobenzene

23. Hydrogen atoms are excited from ground state to the state of the principal quantum number 5. Then the number of spectral lines observed will be:

1. 6
2. 10
3. 15
4. 20

24. Which of the element belongs to pnictogen?

1. Aluminium
2. Silicon
3. Phosphorus
4. Sulphur

25. Calculate the uncertainty in the position of an electron if the uncertainty in its velocity is 5.7 X 10⁵ m/s.

1. 2 X 10 ¹² m
2. 1 X 10^-10m
3. 3 X 10 ³ m
4. 1 X 10 ^-2 m

26. Which of the following group 13 elements has the lowest first ionization enthalpy?

1. Boron
2. Aluminium
3. Gallium
4. Indium

27. The region in the electromagnetic spectrum where the Balmer series lines appear is

1. Infrared
2. Visible
3. Microwaves
4. Ultra Violet

28. The correct order of the decreasing ionic radii among the following isoelectronic species is:

1. K⁺> Ca²⁺>Cl^–>S^2-
2. Ca²⁺ > K⁺ >S^2-  > Cl^–
3. Cl^– > S^2-> Ca²⁺ > K⁺            
4. S^2- > Cl^– > K⁺  > Ca²⁺

29. Rutherford scatterring experiment is based on:

1. Alpha particle scaterring from Gold
2. Beta particle scaterring from Gold
3. Gamma particle scaterring from Gold
4. A and B

30. The correct decreasing order of first ionization enthalpies of five elements in the second period is

1. Be > B > C > N > F
2. N > F > C > B > Be
3. F > N > C > Be > B
4. N > F > B > C > Be

31. The de-Broglie wavelength of a cricket ball of mass 60g moving with a velocity of 10 meters per second is approximately (h = 6.63 X 10^-34 Js)

1. 1.1 X 10 ^-31 meters
2. 1.1 X 10 ^-30 meters
3. 1.1 X 10 ^-28 meters
4. 1.1 X 10 ^-33 meters

32. Lothar Meyer attempt was based on plotting atomic mass vs

1. atomic size
2. atomic volume
3. density
4. all of these

33. In one molal solution that contains 0.5 mole of a solute, there is

1. 500 mL of solvent
2. 500 g of solvent
3. 100 mL of solvent
4. 1000 g of solvent

34. Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: 3.1500 g of hydrated oxalic acid dissolved in water to make 250.0 mL solution will result in 0.1 M oxalic acid solution.
Reason R: Molar mass of hydrated oxalic acid is 126 g mol⁻¹.
In the light of the above statements, choose the correct answer from the options given below:

1. Both A and R are true but R is not the correct explanation of A.
2. A is false but R is true.
3. Both A and R are true and R is the correct explanation of A.
4. A is true but R is false.

35. The following solutions were prepared by dissolving 10 g of glucose (C₆H₁₂O₆) in 250 mL of water (P₁), 10 g of urea (CH₄N₂O) in 250 mL of water (P₂) and 10 g of sucrose
(C₁₂H₂₂O₁₁) in 250 mL of water (P₃). The right option for the decreasing order of osmotic pressure of these solutions is

1. P₃ > P₁ > P₂
2. P₂ > P₁ > P₃
3. P₁ > P₂ > P₃
4. P₂ > P₃ > P₁

36. The vapour pressure of pure CHCl₃ and CH₂Cl₂ are 200 and 41.5 atm respectively. The weight of CHCl₃ and CH₂Cl₂ are 11.9g and 17g respectively in a solution. The vapour pressure of solution (in atm) will be

1. 80.5
2. 79.5
3. 94.3
4. 105.5

37. The correct option for the value of vapour pressure of a solution at 45°C with benzene to octane in molar ratio 3: 2 is [At 45°C vapour pressure of benzene is 280 mm Hg and that of octane is 420 mm Hg. Assume ideal gas

1. 350 mm of Hg
2. 160 mm of Hg
3. 168 mm of Hg
4. 336 mm of Hg

38. Assertion: Vapour pressure of solvent A increases when a more volatile solvent B is added.
       Reason: B is more volatile therefore vapour pressure of B is greater than that of A.

1. Both assertion and reason are true and reason is the correct explanation of assertion.
2. Both assertion and reason are true but reason is not the correct explanation of assertion.
3. Assertion is true but reason is false.
4. Both assertion and reason are false.

39. The mixture which shows positive deviation from Raoult’s law is

1. ethanol + acetone
2. benzene + toluene
3. acetone + chloroform
4. chloroethane + bromoethane

40. The mixture that forms maximum boiling azeotrope is

1. heptane + octane
2. water + nitric acid
3. ethanol + water
4. acetone + carbon disulphide

41. In water saturated air, the mole fraction of water vapour is 0.02. If the total pressure of the saturated air is 1.2 atm, the partial pressure of dry air is

1. 1.18 atm
2. 1.76 atm
3. 1.176 atm
4. 0.98 atm

42. For an ideal solution, the correct option is

1. Δ_mix G = 0 at constant T and P
2. Δ_mix S = 0 at constant T and P
3. Δ_mix V ≠ 0 at constant T and P
4. Δ_mix H = 0 at constant T and P

43. Which of the following statements is correct regarding a solution of two components A and B exhibiting positive deviation from ideal behaviour?

1. Intermolecular attractive forces between and  are stronger than those between .
2. Δ_mix H = 0 at constant T and P.
3. Δ_mix V ≠ 0 at constant T and P.
4. Intermolecular attractive forces between A–A and B–B are equal to those between A–B.

44. Which of the following exhibit tautomerism?


1, 2 and 3
2. 1 and 2        
3. 1 and 3
4. 2 and 3

45. Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula C₄H₈O is:

1. 6
2. 8
3. 10
4. 4