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Chemistry · PYQ NEET UG 2025
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Chemistry · PYQ NEET UG 2025
How many products (including stereoisomers) are expected from monochlorination of the following compound? \( \text{H}_3\text{C}-CH-CH_2-\text{CH}_3 \) with a methyl group on CH
Read answer →Chemistry · PYQ NEET UG 2025
Identify the correct orders against the property mentioned A. \( \text{H}_2\text{O} > \text{NH}_3 > \text{CHCl}_3 \) - dipole moment B. \( \text{XeF}_4 > \text{XeO}_3 > \text{XeF}_2 \) - number of lone pairs on central atom C. \( \text{O-H} > \text{C-H} > \text{N-O} \) - bond length D. \( \text{N}_2 > \text{O}_2 > \text{H}_2 \) - bond enthalpy Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Match List-I with List-II: List-I List-II A Humidity I Solid in solid B Alloy II Liquid in gas C Amalgam III Solid in gas D Smoke IV Liquid in solid Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Among the given compounds I-III, the correct order of bond dissociation energy of C-H bond marked with * is :
Read answer →Chemistry · PYQ NEET UG 2025
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 :
Read answer →Chemistry · PYQ NEET UG 2025
Sugar 'X' A. is found in honey. B. is a keto sugar. C. exists in \( \alpha \) and \( \beta \) - anomeric forms. D. is laevorotatory. 'X' is :
Read answer →Chemistry · PYQ NEET UG 2025
Phosphoric acid ionizes in three steps with their ionization constant values \( \mathrm{K}_{\mathrm{a}_1}, \mathrm{K}_{\mathrm{a}_2} \) and \( \mathrm{K}_{\mathrm{a}_3} \), respectively, while \( \mathrm{K} \) is the overall ionization constant. Which of the following statements are true? A. \( \log \mathrm{K} = \log \mathrm{K}_{\mathrm{a}_1} + \log \mathrm{K}_{\mathrm{a}_2} + \log \mathrm{K}_{\mathrm{a}_3} \) B. \( \mathrm{H}_3\mathrm{PO}_4 \) is a stronger acid than \( \mathrm{H}_2\mathrm{PO}_4^- \) and \( \mathrm{HPO}_4^{2-} \). C. \( \mathrm{K}_{\mathrm{a}_1} > \mathrm{K}_{\mathrm{a}_2} > \mathrm{K}_{\mathrm{a}_3} \) D. \( \mathrm{K}_{\mathrm{a}} = \frac{\mathrm{K}_{\mathrm{a}_3} + \mathrm{K}_{\mathrm{a}_2}}{2} \) Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2025
Given below are two statements : Statement I : Benzenediazonium salt is prepared by the reaction of aniline with nitrous acid at \( 273 - 278\text{ K} \). It decomposes easily in the dry state. Statement II : Insertion of iodine into the benzene ring is difficult and hence iodobenzene is prepared through the reaction of benzenediazonium salt with \( \text{KI} \). In the light of the above statements, choose the most appropriate answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Dalton's Atomic theory could not explain which of the following?
Read answer →Chemistry · PYQ NEET UG 2025
The major product of the following reaction is : \( \begin{array}{c} \text{O} \\ \parallel \\ \text{C-CH}_2-\text{CN} \end{array} \xrightarrow[\text{(ii) } \text{H}_3\text{O}^+]{\text{(i) } \text{CH}_3\text{MgBr (excess)}} \)
Read answer →Chemistry · PYQ NEET UG 2025
Which among the following electronic configurations belong to main group elements? A. \( [\text{Ne}]3\text{s}^1 \) B. \( [\text{Ar}]3\text{d}^34\text{s}^2 \) C. \( [\text{Kr}]4\text{d}^{10}5\text{s}^25\text{p}^5 \) D. \( [\text{Ar}]3\text{d}^{10}4\text{s}^1 \) \nE. \( [\text{Rn}]5\text{f}^06\text{d}^27\text{s}^2 \) Choose the correct answer from the option given below:
Read answer →Chemistry · PYQ NEET UG 2025
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : \( \text{I} \) undergoes \( \text{S}_\text{N}2 \) reaction faster than \( \text{Cl} \). Reason (R) : Iodine is a better leaving group because of its large size. In the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Among the following, choose the ones with equal number of atoms. A. \( 212\text{ g} \) of \( \text{Na}_2\text{CO}_3\text{ (s)} \) [molar mass = \( 106\text{ g} \)] B. \( 248\text{ g} \) of \( \text{Na}_2\text{O (s)} \) [molar mass = \( 62\text{ g} \)] C. \( 240\text{ g} \) of \( \text{NaOH (s)} \) [molar mass = \( 40\text{ g} \)] D. \( 12\text{ g} \) of \( \text{H}_2\text{ (g)} \) [molar mass = \( 2\text{ g} \)]\nE. \( 220\text{ g} \) of \( \text{CO}_2\text{(g)} \) [molar mass = \( 44\text{ g} \)] Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a \( \text{Cr}^{2+} \) ion \( (\text{Z} = 24) \) is the same as that of a \( \text{Nd}^{3+} \) ion \( (\text{Z} = 60) \). In the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Which of the following are paramagnetic? A. \( [\text{NiCl}_4]^{2-} \) B. \( \text{Ni(CO)}_4 \) C. \( [\text{Ni(CN)}_4]^{2-} \) D. \( [\text{Ni(H}_2\text{O)}_6]^{2+} \) \nE. \( \text{Ni(PPh}_3)_4 \) Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2025
Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?
Read answer →Chemistry · PYQ NEET UG 2025
Consider the following compounds : \( \mathrm{KO}_2, \mathrm{H}_2\mathrm{O}_2 \) and \( \mathrm{H}_2\mathrm{SO}_4 \). The oxidation states of the underlined elements in them are, respectively,
Read answer →Chemistry · PYQ NEET UG 2025
The correct order of decreasing acidity of the following aliphatic acids is : (1) \((\text{CH}_3)_3\text{CCOOH} > (\text{CH}_3)_2\text{CHCOOH} > \text{CH}_3\text{COOH} > \text{HCOOH} (2) \text{CH}_3\text{COOH} > (\text{CH}_3)_2\text{CHCOOH} > (\text{CH}_3)_3\text{CCOOH} > \text{HCOOH} (3) \text{HCOOH} > \text{CH}_3\text{COOH} > (\text{CH}_3)_2\text{CHCOOH} > (\text{CH}_3)_3\text{CCOOH} (4) \text{HCOOH} > (\text{CH}_3)_3\text{CCOOH} > (\text{CH}_3)_2\text{CHCOOH} > \text{CH}_3\text{COOH}\)
Read answer →Chemistry · PYQ NEET UG 2025
Which one of the following reactions does NOT belong to "Lassaigne's test"?
Read answer →Chemistry · PYQ NEET UG 2025
Match List I with List II. List I (Name of Vitamin) | List II (Deficiency disease) A. \( \text{Vitamin B}_{12} \) | I. Cheilosis B. \( \text{Vitamin D} \) | II. Convulsions C. \( \text{Vitamin B}_2 \) | III. Rickets D. \( \text{Vitamin B}_6 \) | IV. Pernicious anaemia Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Total number of possible isomers (both structural as well as stereoisomers) of cyclic ethers of molecular formula \( \text{C}_4\text{H}_8\text{O} \) is :
Read answer →Chemistry · PYQ NEET UG 2025
Given below are two statements : Statement I : A hypothetical diatomic molecule with bond order zero is quite stable. Statement II : As bond order increases, the bond length increases. In the light of the above statements, choose the most appropriate answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
