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Chemistry · PYQ NEET UG 2025
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Chemistry · PYQ NEET UG 2025
Energy and radius of first Bohr orbit of \( \text{He}^+ \) and \( \text{Li}^{2+} \) are [Given \( R_H = 2.18 \times 10^{-18} \text{ J}, a_0 = 52.9 \text{ pm} \)]
Read answer →Chemistry · PYQ NEET UG 2025
\( \mathrm{C(s) + 2H_2(g) \rightarrow CH_4(g); \Delta H = -74.8 kJ mol^{-1}} \) निम्नलिखित में से कौन सा आरेख उपर्युक्त अभिक्रिया का सटीक निरूपण देता है? [R \( \rightarrow \) अभिकारकों; P \( \rightarrow \) उत्पादों]
Read answer →Chemistry · PYQ NEET UG 2025
Which one of the following compounds can exist as cis-trans isomers?
Read answer →Chemistry · PYQ NEET UG 2025
The correct order of the wavelength of light absorbed by the following complexes is, A. \( [\mathrm{Co}(\mathrm{NH}_3)_6]^{3+} \) B. \( [\mathrm{Co}(\mathrm{CN})_6]^{3-} \) C. \( [\mathrm{Cu}(\mathrm{H}_2\mathrm{O})_4]^{2+} \) D. \( [\mathrm{Ti}(\mathrm{H}_2\mathrm{O})_6]^{3+} \) Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2025
Identify the suitable reagent for the following conversion. \( \begin{array}{c} \text{O} \\ \parallel \\ \text{C-OCH}_3 \end{array} \longrightarrow \text{CHO} \)
Read answer →Chemistry · PYQ NEET UG 2025
Match List-I with List-II: List-I List-II A ( CHCl_3 + CH_3NH_2 \) I Distillation under reduced pressure B Crude oil in petroleum industry II Steam distillation C Glycerol from spent-lye III Fractional distillation D Aniline - water IV Simple distillation Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Higher yield of NO in \( \text{N}_2\text{(g)} + \text{O}_2\text{(g)} \rightleftharpoons 2\text{NO(g)} \) can be obtained at [\( \Delta H \) of the reaction \( = +180.7 \text{ kJ mol}^{-1} \)] A. higher temperature B. lower temperature C. higher concentration of \( \text{N}_2 \) D. higher concentration of \( \text{O}_2 \) Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2025
Predict the major product 'P' in the following sequence of reactions - \( \text{CH}_3 \) (i) \( \text{HBr}, \text{benzoyl peroxide} \) (ii) \( \text{KCN} \) (iii) \( \text{Na (Hg)} / \text{C}_2\text{H}_5\text{OH} \)
Read answer →Chemistry · PYQ NEET UG 2025
Match List-I with List-II: List-I List-II A ( \mathrm{XeO_3} \) I ( \mathrm{sp^3d; linear} \) B ( \mathrm{XeF_2} \) II ( \mathrm{sp^3; pyramidal} \) C ( \mathrm{XeOF_4} \) III ( \mathrm{sp^3d^3; distorted octahedral} \) D ( \mathrm{XeF_6} \) IV ( \mathrm{sp^3d^2; square pyramidal} \) Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Which one of the following reactions does NOT give benzene as the product ?
Read answer →Chemistry · PYQ NEET UG 2025
Which of the following statements are true? A. Unlike Ga that has a very high melting point, Cs has a very low melting point. B. On Pauling scale, the electronegativity values of N and Cl are not the same. C. \( \text{Ar}, \text{K}^+, \text{Cl}^-, \text{Ca}^{2+}, \) and \( \text{S}^{2-} \) are all isoelectronic species. D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is \( \text{Si} > \text{Al} > \text{Mg} > \text{Na} \).\nE. The atomic radius of Cs is greater than that of Li and Rb. 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 Haber proce I ( \text{Fe catalyst} \) B Wacker oxidation II ( \text{PdCl}_2 \) C Wilkinson catalyst III ( [(\text{PPh}_3)_3\text{RhCl}] \) D Ziegler catalyst IV ( \text{TiCl}_4 \) with \( \text{Al(CH}_3)_3 \) Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Match List I with List II: List I (Ion) List II (Group Number in Cation Analysis) A \( \text{Co}^{2+} \) I Group-I B \( \text{Mg}^{2+} \) II Group-III C \( \text{Pb}^{2+} \) III Group-IV D \( \text{Al}^{3+} \) IV Group-VI Choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2025
Which of the following aqueous solution will exhibit highest boiling point?
Read answer →Chemistry · PYQ NEET UG 2025
5 moles of liquid X and 10 moles of liquid Y make a solution having a vapour pressure of 70 torr. The vapour pressures of pure X and Y are 63 torr and 78 torr respectively. Which of the following is true regarding the described solution?
Read answer →Chemistry · PYQ NEET UG 2025
Which one of the following compounds does not decolourize bromine water?
Read answer →Chemistry · PYQ NEET UG 2025
The standard heat of formation, in \( \text{kcal/mol} \) of \( \text{Ba}^{2+} \) is : [Given : standard heat of formation of \( \text{SO}_4^{2-} \text{ (aq)} = -216 \text{ kcal/mol} \), standard heat of crystallisation of \( \text{BaSO}_4\text{(s)} = -4.5 \text{ kcal/mol} \), standard heat of formation of \( \text{BaSO}_4\text{(s)} = -349 \text{ kcal/mol} \)]
Read answer →Chemistry · PYQ NEET UG 2025
If the molar conductivity \( (\Lambda_m) \) of a \( 0.050\text{ mol L}^{-1} \) solution of a monobasic weak acid is \( 90\text{ S cm}^2\text{ mol}^{-1} \), its extent (degree) of dissociation will be \( [ \text{Assume } \Lambda^\circ_+ = 349.6\text{ S cm}^2\text{ mol}^{-1} \text{ and } \Lambda^\circ_- = 50.4\text{ S cm}^2\text{ mol}^{-1}. \)]
Read answer →Chemistry · PYQ NEET UG 2025
