OnlineCBT
Chemistry · PYQ NEET UG 2023
Practice questions & answers
Find a question, read its answer and explanation, then practise related questions.
Chemistry PYQ NEET UG 2023 · Clear filters
49 questions
Chemistry · PYQ NEET UG 2023
The element expected to form largest ion to achieve the nearest noble gas configuration is:
Read answer →Chemistry · PYQ NEET UG 2023
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : \n Assertion A : In equation \( \Delta_r G = -nFE_{\text{cell}} \), value of \( \Delta_r G \) depends on \( n \).\nReasons R : \( E_{\text{cell}} \) is an intensive property and \( \Delta_r G \) is an extensive property.\nIn the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2023
Which complex compound is most stable?\n(1) \( [\text{Co}(\text{NH}_3)_4(\text{H}_2\text{O})\text{Br}](\text{NO}_3)_2 \)\n(2) \( [\text{Co}(\text{NH}_3)_3(\text{NO}_3)_3] \)\n(3) \( [\text{CoCl}_2(\text{en})_2]\text{NO}_3 \)\n(4) \( [\text{Co}(\text{NH}_3)_6]_2(\text{SO}_4)_3 \)
Read answer →Chemistry · PYQ NEET UG 2023
The relation between \( n_{\text{m}} \), (\( n_{\text{m}} \) = the number of permissible values of magnetic quantum number (\( m \))) for a given value of azimuthal quantum number (\( l \)), is
Read answer →Chemistry · PYQ NEET UG 2023
What fraction of one edge centred octahedral void lies in one unit cell of fcc?
Read answer →Chemistry · PYQ NEET UG 2023
The stability of \( \mathrm{Cu^{2+}} \) is more than \( \mathrm{Cu^+} \) salts in aqueous solution due to -
Read answer →Chemistry · PYQ NEET UG 2023
For a certain reaction, the rate \( = k[\text{A}]^2[\text{B}] \), when the initial concentration of A is tripled keeping concentration of B constant, the initial rate would
Read answer →Chemistry · PYQ NEET UG 2023
Which of the following statements are INCORRECT?\nA. All the transition metals except scandium form \( \text{MO} \) oxides which are ionic.\nB. The highest oxidation number corresponding to the group number in transition metal oxides is attained in \( \text{Sc}_2\text{O}_3 \) to \( \text{Mn}_2\text{O}_7 \).\nC. Basic character increases from \( \text{V}_2\text{O}_3 \) to \( \text{V}_2\text{O}_4 \) to \( \text{V}_2\text{O}_5 \).\nD. \( \text{V}_2\text{O}_4 \) dissolves in acids to give \( \text{VO}^{3-} \) salts.\nE. \( \text{CrO} \) is basic but \( \text{Cr}_2\text{O}_3 \) is amphoteric.\nChoose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
On balancing the given redox reaction, \( a \text{ Cr}_2\text{O}_7^{2-} + b \text{ SO}_3^{2-} (\text{aq}) + c \text{ H}^+ (\text{aq}) \rightarrow \) \( 2a \text{ Cr}^{3+} (\text{aq}) + b \text{ SO}_4^{2-} (\text{aq}) + \frac{c}{2} \text{ H}_2\text{O} (\ell) \) the coefficients \( a \), \( b \) and \( c \) are found to be, respectively -
Read answer →Chemistry · PYQ NEET UG 2023
Which of the following statements are NOT correct?\nA. Hydrogen is used to reduce heavy metal oxides to metals.\nB. Heavy water is used to study reaction mechanism.\nC. Hydrogen is used to make saturated fats from oils.\nD. The H-H bond dissociation enthalpy is lowest as compared to a single bond between two atoms of any element.\nE. Hydrogen reduces oxides of metals that are more active than iron.\nChoose the most appropriate answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
The right option for the mass of \( \text{CO}_2 \) produced by heating \( 20\text{ g} \) of \( 20\% \) pure limestone is (Atomic mass of \( \text{Ca} = 40 \)) \( [\text{CaCO}_3 \xrightarrow{1200\text{ K}} \text{CaO} + \text{CO}_2] \)
Read answer →Chemistry · PYQ NEET UG 2023
Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is :
Read answer →Chemistry · PYQ NEET UG 2023
Match List - I with List - II :\nList - I (Oxoacids of Sulphur)\nA. Peroxodisulphuric acid\nB. Sulphuric acid\nC. Pyrosulphuric acid\nD. Sulphurous acid\nList - II (Bonds)\nI. Two \( \text{S-OH} \), Four \( \text{S=O} \), One \( \text{S-O-S} \)\nII. Two \( \text{S-OH} \), One \( \text{S=O} \)\nIII. Two \( \text{S-OH} \), Four \( \text{S=O} \), One \( \text{S-O-O-S} \)\nIV. Two \( \text{S-OH} \), Two \( \text{S=O} \)\nChoose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R : \n Assertion A : Helium is used to dilute oxygen in diving apparatus.\nReasons R : Helium has high solubility in \( \text{O}_2 \).\nIn the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
A compound is formed by two elements A and B. The element B forms cubic close packed structure and atoms of A occupy \( 1/3 \) of tetrahedral voids. If the formula of the compound is \( \text{A}_x\text{B}_y \), then the value of \( x + y \) is in option
Read answer →Chemistry · PYQ NEET UG 2023
The number of \( \sigma \) bonds, \( \pi \) bonds and lone pair of electrons in pyridine, respectively are:
Read answer →Chemistry · PYQ NEET UG 2023
Amongst the given options which of the following molecules / ion acts as a Lewis acid?
Read answer →Chemistry · PYQ NEET UG 2023
निम्नलिखित अभिक्रिया में उत्पाद को पहचानिए: \( \text{C}_6\text{H}_5\text{N}_2^+\text{Cl}^- \xrightarrow{(i) \text{Cu}_2\text{Br}_2/\text{HBr}} \text{Product} \xrightarrow{(ii) \text{Mg}/\text{dry ether}} \xrightarrow{(iii) \text{H}_2\text{O}} \text{Product} \)
Read answer →Chemistry · PYQ NEET UG 2023
The given compound \( \text{CH} = \text{CH} - \text{CH} - \text{CH}_2 - \text{CH}_3 \) with \( \text{X} \) attached to a benzene ring is an example of
Read answer →Chemistry · PYQ NEET UG 2023
The equilibrium concentrations of the species in the reaction \( A + B \rightleftharpoons C + D \) are \( 2, 3, 10 \) and \( 6 \text{ mol L}^{-1} \), respectively at \( 300 \text{ K} \). \( \Delta G^{\circ} \) for the reaction is \( (R = 2 \text{ cal / mol K}) \)
Read answer →Chemistry · PYQ NEET UG 2023
Intermolecular forces are forces of attraction and repulsion between interacting particles that will include :\nA. dipole - dipole forces.\nB. dipole - induced dipole forces.\nC. hydrogen bonding.\nD. covalent bonding.\nE. dispersion forces.\nChoose the most appropriate answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
Given below are two statements : Statement I : The nutrient deficient water bodies lead to eutrophication. Statement II : Eutrophication leads to decrease in the level of oxygen in the water bodies. In the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
