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Chemistry · PYQ NEET UG 2026
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Chemistry · PYQ NEET UG 2026
Two moles of an ideal gas undergo free expansion from $10\text{ L}$ to $100\text{ L}$ at $300\text{ K}$. The values of $\Delta S_{\text{system}}$ and $\Delta S_{\text{surroundings}}$ are (R is universal gas constant)
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Match the species in List I with their geometry in List II List I List II A \( \text{PCl}_5 \) I. Tetrahedral B \( \text{BrF}_5 \) II. Square Planar C \( \text{BF}_4^- \) III. Trigonal bipyramidal D \( [\text{Ni(CN)}_4]^{2-} \) IV. Square pyramidal Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
Statement-I : Heating \( \text{NaCl} \) with concentrated \( \text{H}_2\text{SO}_4 \) and \( \text{MnO}_2 \) results in oxidation of \( \text{Mn} \). Statement-II : Heating \( \text{NaI} \) with concentrated \( \text{H}_2\text{SO}_4 \) and \( \text{MnO}_2 \) results in reduction of \( \text{Mn} \). In light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: The first ionization enthalpy of \( O \) is lower than that of \( N \) and \( F \). Reason R: The loss of an electron from \( O \) leads to stable half-filled \( p \) orbital. In light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is
Read answer →Chemistry · PYQ NEET UG 2026
A 1:3 electrolyte in an aqueous solution is
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The formula of tetraammineaquachloridocobalt(III) chloride is
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The compound that CANNOT be obtained from the aldol condensation reaction shown below, is
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In acidic medium, $10\text{ mL}$ of $0.25\text{ M}$ oxalic acid is titrated with $\text{KMnO}_4$ solution. If the volume of $\text{KMnO}_4$ solution required to reach end point is $10\text{ mL}$, the strength of the $\text{KMnO}_4$ solution is
Read answer →Chemistry · PYQ NEET UG 2026
Given below are two statements: Statement I : trans-But-2-ene upon treatment with \( \text{Br}_2 \) in \( \text{CCl}_4 \) gives the following product (shown via Newman projection). Statement II : cis-But-2-ene upon treatment with alkaline \( \text{KMnO}_4 \) gives the following product (shown via Newman projection). In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
The following carbocation is stabilized by the interaction of the empty \( p \) orbital with
Read answer →Chemistry · PYQ NEET UG 2026
Assertion A : Generally, 3d transition metals have high melting points. Reason R : Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding. In light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
The complex which has facial and meridional isomers is (Given: py = pyridine and en = H_2N-CH_2-CH_2-NH_2)
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The correct statement is
Read answer →Chemistry · PYQ NEET UG 2026
Consider the following reaction sequences and choose the correct option.
Read answer →Chemistry · PYQ NEET UG 2026
Assertion (A): For an ideal solution formed by mixing liquids P and Q, \( \Delta_{\text{mix}} \text{H} = 0 \) and \( \Delta_{\text{mix}} \text{V} = 0 \). Reason (R): No interactions occur between P and Q. In the light of the above statements, choose the most appropriate answer from the options given below.
Read answer →Chemistry · PYQ NEET UG 2026
Arrange the following compounds in the increasing order of polarity: A. \( CH_3CH_2OCH_2CH_3 \) B. \( CH_3CH_2OH \) C. \( CH_3COCH_3 \) D. \( CH_3COOH \)
Read answer →Chemistry · PYQ NEET UG 2026
For a salt \( \text{XY} \), which is a strong electrolyte, the plot of \( \Lambda_m \) versus \( \sqrt{c} \) has a slope of \( -90.0 \text{ S cm}^2 \text{ mol}^{-3/2} \text{ L}^{1/2} \) at \( 298\text{ K} \). At \( 0.01\text{ M} \) concentration of \( \text{XY} \), the value of \( \Lambda_m \) is \( 145.0 \text{ S cm}^2 \text{ mol}^{-1} \). The limiting molar conductivity of \( \text{Y}^- \) ion (\( \lambda^0_{\text{Y}^-} \), in \( \text{S cm}^2 \text{ mol}^{-1} \)) at \( 298\text{ K} \) will be (Given: \( \lambda^0_{\text{X}^+} = 74.0 \text{ S cm}^2 \text{ mol}^{-1} \))
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Among the following options, the correct trend in the electron gain enthalpy is
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One of the products formed in the following reaction is
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$2\text{A} \xrightarrow{k} \text{B}$ is a zero-order reaction, where $k = 1.0\text{ mol L}^{-1}\text{ min}^{-1}$. If the initial concentration of A is $2\text{ M}$, then the time taken to complete $75\%$ of the reaction will be
Read answer →Chemistry · PYQ NEET UG 2026
Among the following, the compound having conjugated double bonds is
Read answer →Chemistry · PYQ NEET UG 2026
