NEET WEEKLY TEST CHEMISTRY (25.10.2025)

Welcome to your NEET WEEKLY TEST CHEMISTRY (25.10.2025)

Name

ZZR ID

IMPORTANT INSTRUCTIONS

1. The test is of 90 minutes duration and Test Booklet contains 45 questions. Each question carried 4 marks for each correct response, the candidate will get 4 marks. For each incorrect response, one mark will be deducted from the total scores.
2. Use of Cell phone/Electronics gadgets/Calculator etc. are not allowed.

CHEMISTRY

1. 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

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2. What is the ratio of the longest to shortest wavelengths in Brackett series of Hydrogen spectra?

1) 12/3
2) 25/9
3) 16/25
4) 4/3

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3. 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

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4. What is the value of orbital angular momentum for an electron in 5s orbital?

1) 1
2) 0
3) 2
4) 4

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5. Which of the following is the energy of a possible excited state of Hydrogen?

1) +3.4 eV
2) -13.6 eV
3) -3.4 eV
4) +13.6 eV

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6. How many spherical nodes are present in 5s orbital in a Hydrogen atom

1) 3
2) 4
3) 1
4) 0

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7. Azimuthal quantum number for the last electron in Ca atom is:

1) 0
2) 1
3) 2
4) 3

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

1) 2 × 10 ¹² m
2) 1 × 10^-10m
3) 3 × 10 ³ m
4) 1 × 10 ^-2 m

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9. How many electrons in Magnesium have m = 0?

1) 12
2) 10
3) 8
4) 6

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10. The speed of an electron having a wavelength of 10^-5 m is

1) 7.27 × 10⁶ m/s
2) 0.761 ×10⁴ m/s
3) 0.725 × 10² m/s
4) 7.6 3 × 10⁴ m/s

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11. The uncertainty in measuring velocity of a proton is 4 X 10³ m/s. The minimum uncertainty involved in measuring the position of proton will be?

1) 3.7 × 10⁴ m
2) 4.3 × 10^-12 m
3) 7.9 × 10 ^-12 m
4) 3.7 × 10⁸ m

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12. What is the normality of a solution containing 49 g of H₂SO₄ in 100 m L of solution?

1) 1N
2) 0.01 N
3) 10 N
4) 100 N

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13. When 20 g of aluminium reacts with 25g of oxygen, how many grams of aluminium oxide (Al₂O₃) are formed? (At. masses: Al = 27.0, O = 16.0)

1) 30.25 g
2) 37.74 g
3) 50.32 g
4) 52.50 g

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14. Find the molarity of liquid HCl if density if liquid HCl is 2.37 g/cc?

1) 60 M
2) 65 M
3) 45 M
4) 50 M

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15. How many grams of dibasic acid (molecular wt. 200) should be present in 100 mL of the aqueous solution to give 5 N?

1) 50 g
2) 1g
3) 10g
4) 5g

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16. 20 g of hydrofluoric acid gas occupies 5.6 litres of volume at NTP. If the Empirical formula of the gas is HF, then its molecular formula will be

1) HF
2) H₂F₂3) H₃F₃4) H₄F₄

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17. A 5.60 L container at NTP contains a mixture of methane (CH₄) and ethane (C₂H₆) gases. The total mass of the gaseous mixture is 8 g. Calculate the mole fraction of methane in the mixture.
(Molar mass: CH₄ = 16 g/mol, C₂H₆ = 30 g/mol)

1) 0.50
2) 0.35
3) 0.30
4) 0.20

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18. A sample of carbon dioxide contains 1.2 g of carbon and 3.2 g of oxygen. Another sample of carbon dioxide from a different source contains 1.5 g of carbon and 4.0 g of oxygen. Which law of chemical combination is illustrated by these data?

1) Law of Conservation of Mass
2) Law of Definite Proportions
3) Law of Multiple Proportions
4) Law of Reciprocal Proportions

None

19. 5.6 L of CO is mixed with 2.8 L of O₂ and ignited. The reaction proceeds as: 2CO+O₂→2CO₂All volumes are measured at NTP. The volume of CO₂ formed is:

1) 2.8 L
2) 5.6 L
3) 1.4 L
4) 4.2 L

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20. How many atoms of oxygen are present in 18 g of glucose?

1) 0.6022 x 10²³2) 3.011 x 10²³3) 3.6 x 10²³4) 6.022 x 10²³

None

21. What mass of 85 % pure CaCO₃will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction?

1) 1.32 g
2) 1.47 g
3) 1.25 g
4) 3.66 g

None

22. The percentage of X in a compound is 0.7 % by mass (atomic mass of X = 78.4 amu). Then, the minimum molecular mass of compound which contains 2 X atoms is

1) 2.24 x 10⁴2) 2.24 x 10³3) 3.136 x 10⁴4) 3.136 x 10³

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23) 4.516 × 10²² molecules are removed from a vessel containing 2240 cc of oxygen gas (O₂) at STP. How many moles of O₂ are remaining in the vessel?

1) 0.075
2) 0.017
3) 0.5
4) 0.025

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24. The Prussian blue colour obtained during the test of nitrogen by Lassaigne’s test is due to the formation of

1) Fe₄[Fe (CN)₆]₃2) Na₃[Fe (CN)₆]
3) Fe (CN)₃4) Na₄[Fe(CN)₅NOS]

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25. A compound which does not give a positive test in Lassaigne’s test for Nitrogen is

1) Urea
2) Hydrazine
3) Azobenzene
4) Phenylhydrozine

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26. Sodium Nitroprusside when added to an alkaline solution of Sulphide ions produce a

1) Red colouration
2) Blue colouration
3) Purple colouration
4) Brown colouration

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27. Chocolate brown precipitate is formed with

1) Fe⁺³ + SCN^–
2) Cu⁺² + [Fe(CN)₆]^-4
3) Fe⁺³ + [Fe(CN)₆]^-4
4) Ni⁺² + DMG^–

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28. When H2S gas is passed through an ammonical salt solution X, a slightly white precipitate is formed. Then X can be

1) Cobalt salt
2) Lead slat
3) Zinc Salt
4) Silver Salt

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29. In the following how many basic radical (cation) belong to group – IV?
NH⁴⁺, Al⁺³, Zn⁺², Mn⁺², Ni⁺², Ca⁺², Pb⁺²

1) 4
2) 3
3) 5
4) 7

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30. Which of the following moist gas turn red litmus paper into blue.

1) H₂S
2) NO₂3) NH₃4) SO₂

None

31. Statement-I: When H₂S is passed through sodium-nitroprusside solution it gives purple colour.
Statement-II: When K₂CrO₄ solution is treated with Barium Acetate it gives red precipitate.

1) Statement-I is false, but Statement-II is true
2) Both Statement-I and II are false.
3) Statement-I is true but Statement-II is false
4) Both Statemnt-I and II are true.

None

32. Match Column I with Column II

1) (P) – 4, (Q) – 2, (R) – 1, (S) – 3
2) (P) – 2, (Q) – 4, (R) – 1, (S) – 3
3) (P) – 3, (Q) – 1, (R) – 2, (S) – 4
4) (P) – 4, (Q) – 3, (R) – 2, (S) – 1

None

33. Which is (are) acidic Radical(s)?

1) HCO₃^–2) NO₃^–3) S₂4) All of these

None

34. Which is (are) not observed by dil. H₂SO₄?

1) Chloride
2) Carbonate
3) Nitrate
4) Both (1) and (3)

None

35. How many stereoisomer are possible in lactic acid?

1) 0
2) 2
3) 3
4) 4

None

1) Ethyl alcohol
2) Propyl alcohol
3) Ethyl chloride
4) Methyl chloride

None

37. Identify the product Y

1) CH₃CH₂NH₂2) CH₃CH₃OH
3) CH₃CH₂NHCH₃4) CH₃CH₂CN

None

38. Which of the following acids does not exhibit optical isomerism?

1) Tartaric acid
2) α-amino acids
3) Maleic acid
4) Lactic acid

None

39. Replacement of Cl of chlorobenzene to give phenol requires drastic conditions. But chlorine of 2,4-dinitrochlorobenzene is readily replaced:

1) NO₂ donates electron meta position
2) NO₂ withdraws electron from ortho and para positions
3) NO₂ make ring electron rich at ortho and para.
4) NO₂ withdraws electron from meta position.

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40. During debromination of meso-dibromobutane, the major product formed is

1) n-butane
2) 1-butene
3) cis-2-butene
4) trans-2-butene.

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41. SN₁ reaction is fastest in

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42. For , the increasing order of nucleophilicity would be

1) Cl^–< Br^– < I^–
2) I^–< Cl^– < Br^–3) Br^– < Cl^–< I^^–
4) I^–< Br^– < Cl^–

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43. Which of the following halides will be most reactive towards SN₂reaction and SN₁ reaction, respectively,

1) (I), (II)
2) (II), (I)
3) (I), (III)
4) (III), (I)

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44. Which one is most reactive towards SN₁ reaction

1) C₆ H₅ CH₂ Br
2) C₆ H₅ CH(C₆H₅)Br
3) C₆ H₅CH(CH₃)Br
4) C₆H₅ C(CH₃)(C₆ H₅)Br

None

45. Which of the following has highest nucleophilicity?

1) SH^–2) H₂O
3) OH^–4) F^–

None

NEET WEEKLY TEST CHEMISTRY (25.10.2025)

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