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Chemistry · PYQ NEET UG 2023
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Chemistry · PYQ NEET UG 2023
निम्नलिखित अभिक्रिया में प्राप्त मुख्य उत्पाद को पहचानिए : \( \text{PhCHO} + 2[\text{Ag}(\text{NH}_3)_2]^+ + 3^-\text{OH} \xrightarrow{\Delta} \text{major product} \)
Read answer →Chemistry · PYQ NEET UG 2023
The reaction that does NOT take place in a blast furnace between \( 900\text{ K} \) to \( 1500\text{ K} \) temperature range during extraction of iron is :
Read answer →Chemistry · PYQ NEET UG 2023
Consider the following reaction and identify the product (P). \( \text{3-Methylbutan-2-ol} + \text{HBr} \rightarrow \text{Product (P)} \)
Read answer →Chemistry · PYQ NEET UG 2023
निम्नलिखित अभिक्रिया में उत्पाद (A) को पहचानिए: \( \text{यौगिक} \xrightarrow[\text{conc. HCl}]{\text{Zn-Hg}} \text{(A)} + 2\text{H}_2\text{O} \)
Read answer →Chemistry · PYQ NEET UG 2023
The conductivity of centimolar solution of \( \mathrm{KCl} \) at \( 25^{\circ} \mathrm{C} \) is \( 0.0210 \text{ ohm}^{-1} \text{ cm}^{-1} \) and the resistance of the cell containing the solution at \( 25^{\circ} \mathrm{C} \) is \( 60 \text{ ohm} \). The value of cell constant is -
Read answer →Chemistry · PYQ NEET UG 2023
निम्नलिखित में से कौन सा विकल्प बॉयल के नियम का सही ग्राफिय निरूपण है?
Read answer →Chemistry · PYQ NEET UG 2023
Given below are two statements :\n Statement I : A unit formed by the attachment of a base to \( 1' \) position of sugar is known as nucleoside\n Statement II : When nucleoside is linked to phosphorous acid at \( 5' \)-position of sugar moiety, we get nucleotide.\nIn the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
Match List - I with List - II :\nList - I\nA. Coke\nB. Diamond\nC. Fullerene\nD. Graphite\nList - II\nI. Carbon atoms are \( \mathrm{sp}^{3} \) hybridised.\nII. Used as a dry lubricant\nIII. Used as a reducing agent\nIV. Cage like molecules\nChoose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with \( \mathrm{Fe}^{3+} \) due to the formation of -\n(1) \( \mathrm{Fe}_{4}[\mathrm{Fe}(\mathrm{CN})_{6}]_{3} \cdot \mathrm{xH}_{2} \mathrm{O} \)\n(2) \( \mathrm{NaSCN} \)\n(3) \( [\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}]^{4-} \)\n(4) \( [\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
Read answer →Chemistry · PYQ NEET UG 2023
The correct order of energies of molecular orbitals of \( \text{N}_2 \) molecule, is :
Read answer →Chemistry · PYQ NEET UG 2023
Pumice stone is an example of -
Read answer →Chemistry · PYQ NEET UG 2023
Some tranquilizers are listed below. Which one from the following belongs to barbiturates?
Read answer →Chemistry · PYQ NEET UG 2023
Taking stability as the factor, which one of the following represents correct relationship?
Read answer →Chemistry · PYQ NEET UG 2023
Which amongst the following molecules on polymerization produces neoprene?
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 : Metallic sodium dissolves in liquid ammonia giving a deep blue solution, which is paramagnetic.\nReasons R : The deep blue solution is due to the formation of amide.\nIn the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
Which of the following reactions will NOT give primary amine as the product? (1) \( \mathrm{CH}_{3} \mathrm{CONH}_{2} \xrightarrow{\mathrm{Br}_{2} / \mathrm{KOH}} \text{ Product} \) (2) \( \mathrm{CH}_{3} \mathrm{CN} \xrightarrow[\text{ (ii) } \mathrm{H}_{3} \mathrm{O}^{\oplus}]{\text{ (i) } \mathrm{LiAlH}_{4}} \text{ Product} \) (3) \( \mathrm{CH}_{3} \mathrm{NC} \xrightarrow[\text{ (ii) } \mathrm{H}_{3} \mathrm{O}^{\oplus}]{\text{ (i) } \mathrm{LiAlH}_{4}} \text{ Product} \) (4) \( \mathrm{CH}_{3} \mathrm{CONH}_{2} \xrightarrow[\text{ (ii) } \mathrm{H}_{3} \mathrm{O}^{\oplus}]{\text{ (i) } \mathrm{LiAlH}_{4}} \text{ Product} \)
Read answer →Chemistry · PYQ NEET UG 2023
Amongst the following, the total number of species NOT having eight electrons around central atom in its outer most shell, is \( \text{NH}_3, \text{AlCl}_3, \text{BeCl}_2, \text{CCl}_4, \text{PCl}_5 \):
Read answer →Chemistry · PYQ NEET UG 2023
निम्नलिखित अभिक्रिया को पूर्ण कीजिए: \nसाइक्लोहेक्सेनोन \(\xrightarrow{\text{HCN}} \text{[B]} \xrightarrow[\Delta]{\text{conc. }\text{H}_2\text{SO}_4} \text{[C]} \n[C] है _________।
Read answer →Chemistry · PYQ NEET UG 2023
Select the correct statements from the following: A. Atoms of all elements are composed of two fundamental particles. B. The mass of the electron is \( 9.10939 \times 10^{-31} \text{ kg} \). C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2023
Identify the final product [D] obtained in the following sequence of reactions. \( \text{CH}_3\text{CHO} \xrightarrow[ii) \text{H}_3\text{O}^+]{i) \text{LiAlH}_4} [A] \xrightarrow[\Delta]{\text{H}_2\text{SO}_4} [B] \xrightarrow{\text{HBr}} [C] \xrightarrow{\text{Na/dry ether}} [D] \)
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 : A reaction can have zero activation energy.\nReasons R : The minimum extra amount of energy absorbed by reactant molecules so that their energy becomes equal to threshold value, is called activation energy.\nIn the light of the above statements, choose the correct answer from the options given below :
Read answer →Chemistry · PYQ NEET UG 2023
Consider the following compounds/species:\ni. Naphthalene\nii. Cyclopentadienyl anion\niii. Cyclobutadiene\niv. Cyclopropenyl anion\nv. Cyclopropenyl cation\nvi. Cyclooctatetraene\nvii. Anthracene\nThe number of compounds/species which obey Huckel's rule is ____.
Read answer →Chemistry · PYQ NEET UG 2023
