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Chemistry · PYQ NEET UG 2019(2)
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Chemistry · Structure of atom
Match List-I with List-II: List-I List-II A J.J. Thomson I Oil drop method for charge B R.A. Millikan II Discovery of neutron C James Chadwick III Measurement of \( e/m_e \) ratio D Ernest Rutherford IV Nuclear model of atom Choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2026
The green paramagnetic species formed by heating KMnO4 at 513 K is
Read answer →Chemistry · EQUILIBRIUM
In the equilibrium \( \text{Fe}^{3+}(\text{aq}) + \text{SCN}^-(\text{aq}) \rightleftharpoons [\text{Fe}(\text{SCN})]^{2+}(\text{aq}) \) (deep red), what happens to the red colour intensity upon the addition of oxalic acid \( (\text{H}_2\text{C}_2\text{O}_4) \) and why?
Read answer →Chemistry · PYQ NEET UG 2017
Which one is the most acidic compound?
Read answer →Chemistry · Some Basic Concepts of Chemistry
According to the convention for rounding off numbers, if the rightmost digit to be removed is \( 5 \), followed by no other digits, which of the following pairs are correctly rounded off to two significant figures?
Read answer →Chemistry · Structure of atom
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Macroscopic objects in our daily life do not show wave-like properties. Reason (R): The wavelengths associated with macroscopic objects are extremely short because of their large mass. In the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · Structure of atom
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): The energy of the orbitals in a hydrogen atom depends solely on the principal quantum number \( n \).\n Reason (R): In a hydrogen atom, the 2s and 2p orbitals have exactly the same energy. \nIn the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · Structure of atom
An atom of an element contains \( 29 \) electrons and \( 35 \) neutrons. Deduce the number of protons and the atomic number of the element.
Read answer →Chemistry · PYQ NEET UG 2023
Homoleptic complex from the following complexes is :
Read answer →Chemistry · PYQ NEET UG 2016(2)
Zinc can be coated on iron to produce galvanized iron but the reverse is not possible. It is because
Read answer →Chemistry · PYQ NEET UG 2018
Which of the following carbocations is expected to be most stable?
Read answer →Chemistry · Structure of atom
Calculate the frequency of the radiation emitted when an electron jumps from the \( n = 5 \) state to the \( n = 2 \) state in a hydrogen atom (\( R_H = 2.18 \times 10^{-18} \text{ J} \), \( h = 6.626 \times 10^{-34} \text{ J s} \)).
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
Given below are two statements: Statement I: Lothar Meyer plotted physical properties such as atomic volume, melting point and boiling point against atomic weight and obtained a periodically repeated pattern. Statement II: In IUPAC nomenclature, the symbol for the digit 0 is 'n' and name root is 'nil'. In the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →Chemistry · Structure of atom
Given below are two statements:\n Statement I: The energy of an orbital in a multi-electron atom depends on both principal quantum number \( n \) and azimuthal quantum number \( l \).\n Statement II: In a hydrogen atom, the 3s, 3p, and 3d orbitals all possess different energies. \nIn the light of the above statements, choose the most appropriate answer from the options given below:
Read answer →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 · Some Basic Concepts of Chemistry
Which of the following physical quantities is an SI base quantity, along with its correct standard SI unit symbol?
Read answer →Chemistry · EQUILIBRIUM
The solubility of a salt \( \text{MX} \) of a weak monobasic acid \( \text{HX} \) depends on pH according to the relation \( S = \sqrt{K_{sp}(1 + \frac{[\text{H}^+]}{K_a})} \). If \( K_{sp} = 4.0 \times 10^{-10} \) and \( K_a = 1.0 \times 10^{-5} \), what is the molar solubility of \( \text{MX} \) at \( \text{pH} = 3.0 \)?
Read answer →Chemistry · EQUILIBRIUM
For the equilibrium \( \text{H}_2(\text{g}) + \text{I}_2(\text{g}) \rightleftharpoons 2\text{HI}(\text{g}) \), the value of \( K_c \) is \( 49.0 \) at a certain temperature. If \( 1.0\text{ mol} \) of \( \text{H}_2 \) and \( 1.0\text{ mol} \) of \( \text{I}_2 \) are placed in a \( 2.0\text{ L} \) flask and allowed to reach equilibrium, what is the total number of moles of \( \text{HI} \) present at equilibrium?
Read answer →Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE
In terms of orbital overlap and bond directionality, which statement explains why simple atomic orbital overlap fails to describe the geometry of \( \text{CH}_4 \)?
Read answer →Chemistry · PYQ NEET UG 2020
The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with \( \mathrm{Na} \), is responsible for the transmission of nerve signals.
Read answer →Chemistry · Structure of atom
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): The orbital wave function \( \psi \) itself has no physical meaning.\n Reason (R): The square of the wave function \( |\psi|^2 \) at any point gives the probability density of the electron at that point. \nIn the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · PYQ NEET UG 2021
The intermediate compound ‘X’ in the following chemical reaction is _______. \( \text{CH}_3 + \text{CrO}_2\text{Cl}_2 \xrightarrow{\text{CS}_2} \text{X} \xrightarrow{\text{H}_3\text{O}^+} \text{CHO} \)
Read answer →Chemistry · PYQ NEET UG 2018
