NEET WEEKLY TEST CHEMISTRY (19.07.2025)

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Welcome to your NEET WEEKLY TEST CHEMISTRY (19.07.2025)

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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. The correct order of ionic radius for O, O⁺ and O^– is

1. O > O^– > O⁺
2. O⁺ > O > O^–3. O^– > O⁺ > O
4. O^– > O > O⁺Deselect Answer

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2. Which one of the following group of atoms or ions is not isoelectronics ?

1. Na⁺, Mg²⁺, Al³⁺
2. Ne, Na⁺, Al³⁺
3. He, H^–, Li ⁺
4. K⁺, Ca²⁺, NeDeselect Answer

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3. Screening effect is not observed in

1. He⁺
2. Be³⁺
3. Li²⁺
4. All of the aboveDeselect Answer

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4. Choose the correct order of atomic size ?

1. Sn > Ce > Lu > Yb
2. Lu > Yb > La > Lr
3. Ce > Pm > Yb > Lu
4. Lu > Yb > Ce > LaDeselect Answer

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5. An element Niobium will be place in which group ?

1. Group 7
2. Group 6
3. Group 5
4. Group 12Deselect Answer

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6. Ionic radii are

1. Inversely proportional to effective nuclear charge
2. Inversely proportional to square of effective nuclear charge
3. Directly proportional to effective nuclear charge
4. Directly proportional to square of effective nuclear chargeDeselect Answer

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7. The correct order of ionic radius are

1. K⁺ > K > Mg ²⁺
2. Na > Na⁺ > Ca ²⁺
3. O^– < O ^2- < O
4. N^3- > F^– < FDeselect Answer

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8. The electronic configuration of an element is [Kr]5s² . Name the element which is just below the element in the periodic table?

1. Cesium
2. Strontium
3. Barium
4. RadiumDeselect Answer

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9. Which of the following is incorrect from the following

1. Unp – Db
2. Uuu – Rg
3. Uuo – Ts
4. Unu – Md

Deselect Answer

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10. The group number, number of valence electrons, and valency of an element with atomic number 35 respectively, are

1. 11, 2, 3
2. 14, 4, 4
3. 17, 7, 1
4. 13, 3, 4

Deselect Answer

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11. The element Z =115 has been discovered recently. It will belong to which of the following family/group

1. Carbon family
2. Oxygen family
3. Nitrogen family
4. Halogen family

Deselect Answer

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12. Which of the following statements are not correct ?

1. Gallium wes earlier called eka –aluminium
2. 4^th period begins with Rubidium
3. 14 elements of 6^th period are called Lanthanoids
4..Henry Moseley discovered the relationship between X-ray spectra and atomic number of the elements.

Deselect Answer

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13. Magnesium reacts with an elements X to form an ionic compound. If the ground state electronic configuration of X is 1s² 2s² 2p⁴, the simplest formula for this compound is

1. Mg₂X₃
2. MgX₂3. Mg₂X₂
4. Mg₃X₂

Deselect Answer

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14. The natural occurring radioactive is

1. Uranium and Neptunium
2. Uranium and Plutonium
3. Uranium and Thorium
4. Thorium and Plutonium

Deselect Answer

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15. Transuranium are

1. Uranium and Neptunium
2. Thorium and Lawrencium
3. Neptunium and Americium
4. Actinium and Uranium

Deselect Answer

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16. There are ____ Representative elements in Modern Periodic Table

1. 13
2. 30
3. 45
4. 50

Deselect Answer

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17. Unh is match with the following elements?

1. Dubnium
2. Bohrium
3. Seaborgium
4. Hassium

Deselect Answer

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18. The first electron gain enthalpy of oxygen is is -141 kj/mol, its second electron gain enthalpy

1. Almost same as the first electron gain enthalpy
2. Negative,but less negative than the first
3. Have positive value
4. More negative value than the first

Deselect Answer

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19. The first ionization energies of Na, Mg, Al and Si respectively are

1. 496, 577, 786, 737
2. 786, 577, 737, 496
3. 496, 577, 737, 786
4. 496, 737, 577, 786

Deselect Answer

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20. Zero electron gain enthalpy is shown by

1. B, N and O
2. Na, Mg and Al
3. H, He and Ne
4. Be, Mg and P

Deselect Answer

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21. Which of the following is incorrect about Ionization enthalpy?

1. IE₁ of Be > IE₁ of B
2. IE₁ of Na < IE₁ of Mg
3. IE₂ of Mg > IE₂ of Al
4. IE₃ of Na < IE₃ of Mg

Deselect Answer

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22. Which of the following represents the electronic configuration of the most electropositive element ?

1. [Ne] 3s¹2. [Ne] 3s²3. [Xe] 6s¹
4^.[Xe] 6s²

Deselect Answer

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23. Which of the following elements has maximum electron affinity ?

1. F
2. Cl
3. Br
4. I

Deselect Answer

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24. The isomerism exhibited by n- propyl alcohol and isopropyl alcohol is

1. Metamerism
2. Position isomerism
3. Functional isomerism
4. None of the above

Deselect Answer

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25. Which of the following compounds shows cis-trans isomerism?

1. (H₃C)₂C = CH – CH₃
2. H₂C = CCl₂
3. C₆H₅(H)C = CH – CH₃
4. More than one of the above

Deselect Answer

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26. Which one of the following pairs of isomers is an example of metamerism?

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

Deselect Answer

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27. Among the given compounds, which can exhibit tautomerism ?

1. I only
2. II only
3. II amd III only
4. all of these

Deselect Answer

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28. Which of the following exhibit tautomerism?

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

Deselect Answer

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29. Tautomerism is exhibited by

1. CH₃)₂NH
2. CH₃)₃CNO
3. R₃CNO₂
4. RCH₂NO₂

Deselect Answer

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30. Which of the following compound is optically active?

1. 1- butanol
2.2-butanol
3. 3-butanol
4. 4-heptanol

Deselect Answer

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31. Optically active is

1. 1 and 4 only
2. 2 only
3. 2 and 3
4. 3 only

Deselect Answer

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32. Relation between the two compound is ?

1. Enantionmers
2. diastereomers
3. meso compound
4. none of the above

Deselect Answer

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33. The enolic form of acetone contains

1. 8 σ-bonds, 2π-bonds and 1 lone pair
2. 9 σ-bonds, 1л-bond and 2 lone pairs
3. 9 σ-bonds, 2π-bonds and 1 lone pair
4. 10 σ-bonds, 1л-bond and 1 lone pair

Deselect Answer

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34. Common name of the compound C₆H₅CHO is

1. Anisole
2. benzaldehyde
3. salicylaldehyde
4. none of these.

Deselect Answer

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

1. sp and sp³ 2. sp and sp²3. sp2 and sp3
4. only sp³

Deselect Answer

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36. IUPAC name of

1. 6-Bromo – 2- chloro cyclohexene
2. 1-Bromo-3- chlorocyclohexene
3. 3-Bromo – 1 chlorocyclohexene
4. 2 bromo 3-chlorocyclohex-2-ene

Deselect Answer

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37. 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

Deselect Answer

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38. Iupac name of

1. 5,6 – dimethylhept-2-ene
2. 2,3- dimethylhept-5-ene
3. 5,6 – dimethylhept-5-ene
4. 5-isopropylhex-2 –ene

Deselect Answer

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39. Shifting of electrons of a multiple bonds under the influence of a reagent is called:

1. l-effect
2. E-effect
3. M-effect
4. R-effect

Deselect Answer

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40. The number of sigma bonds, pi bonds and lone pair of electrons in pyridine, respectively are

1. 11, 3, 1
2. 12, 2, 1
3. 11,2,0
4. 4 12,3,0

Deselect Answer

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41. The most stable carbocation, among the following is

1. (CH₃)₂ C –⁺CH-CH₃
2. CH₃ – CH₂⁺ CH-CH₂-CH₃
3. CH₃ –⁺ CH–CH₂–CH₂–CH₃
4. CH₃– CH₂ –⁺ CH₂

Deselect Answer

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42. The most stable free radical among the following is

1. C₆ H₅ CH₂^∙ CH₂
2. C₆ H₅^∙CHCH₃3. CH₃^∙CH₂
4. CH₃^∙ CHCH₃

Deselect Answer

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43. CH₃-S-CH₂-CH₃ and CH₃-CH₂-S-CH₃ are

1. ring-chain isomers
2. chain isomers
3. functional isomers
4. identical.

Deselect Answer

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44. The number of structural isomers of C₆H₁₄ is

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

Deselect Answer

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45. An organic compound X(molecular formula C₆H₇O₂N ) has six carbon atoms in a ring system, two double and a nitro group as substituent, X is:

1. Homocyclic but not aromatic
2. Aromatic but not homocyclic
3. Homocyclic and aromatic
4. Heterocyclic and aromatic

Deselect Answer

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