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Chemistry · THERMODYNAMICS
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Chemistry · Some Basic Concepts of Chemistry
How much copper can be obtained from \( 100\text{ g} \) of copper sulphate (\( \text{CuSO}_4 \))? (Atomic masses: \( \text{Cu} = 63.5, \text{S} = 32, \text{O} = 16 \))
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 · THERMODYNAMICS
For the dissociation of crystal lattice: \( \text{NaCl}(s) \rightarrow \text{Na}^+(g) + \text{Cl}^-(g) \), the lattice enthalpy is \( \Delta_{\text{lattice}} H^\ominus = +788\text{ kJ mol}^{-1} \) at \( 298\text{ K} \). Assuming ideal gas behavior for ions, what is the change in internal energy (\( \Delta_{\text{lattice}} U^\ominus \))? (Take \( 2RT \approx 5\text{ kJ mol}^{-1} \))
Read answer →Chemistry · PYQ NEET UG 2016(1)
Consider the molecules \( \mathrm{CH}_{4} \), \( \mathrm{NH}_{3} \) and \( \mathrm{H}_{2}\mathrm{O} \). Which of the given statements is FALSE?
Read answer →Chemistry · Classification of Elements and Periodicity in Properties
According to Pauling scale, what is the electronegativity value assigned to fluorine?
Read answer →Chemistry · PYQ NEET UG 2018
Which of the following compounds can form a zwitter ion?
Read answer →Chemistry · PYQ NEET UG 2019(2)
The density of \( 2 \) \( \mathrm{M} \) aqueous solution of \( \mathrm{NaOH} \) is \( 1.28 \) \( \mathrm{g/cm^3} \). The molality of the solution is [Given that molecular mass of \( \mathrm{NaOH} = 40 \) \( \mathrm{g\,mol^{-1}} \)]
Read answer →Chemistry · PYQ NEET UG 2016(2)
निम्नलिखित में से कौन सी संरचना नायलॉन-6,6 बहुलक को दर्शाती है?
Read answer →Chemistry · PYQ NEET UG 2016(2)
The compound that will react most readily with gaseous bromine has the formula ______
Read answer →Chemistry · PYQ NEET UG 2019(1)
The non-essential amino acid among the following is ______.
Read answer →Chemistry · PYQ NEET UG 2019(2)
In the following reaction, \( \text{H}_3\text{C}-\text{C}\equiv\text{CH} \xrightarrow[873\text{ K}]{\text{red hot iron tube}} \text{A} \). The number of sigma \( (\sigma) \) bonds present in the product A, is
Read answer →Chemistry · Some Basic Concepts of Chemistry
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).\n Assertion (A): The formula mass of sodium chloride is taken as 58.5 u instead of molecular mass.\n Reason (R): Solid sodium chloride does not exist as a single discrete molecule; rather, ions are arranged in a three-dimensional lattice structure. \nIn the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · Structure of atom
What is the primary reason why subshells within the same principal shell possess different energies in multi-electron atoms?
Read answer →Chemistry · EQUILIBRIUM
In the student activity demonstrating dynamic equilibrium using two measuring cylinders (1 and 2) and two glass tubes, what determines the final constant level of liquid in the two cylinders when transfer equilibrium is reached?
Read answer →Chemistry · THERMODYNAMICS
For most ionic compounds, the enthalpy of solution (\( \Delta_{\text{sol}} H^\ominus \)) is positive, yet they dissolve in water. Why does the solubility of most such salts increase with a rise in temperature?
Read answer →Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE
Which of the following sets contains only species that are isoelectronic and have a bond order of 3?
Read answer →Chemistry · PYQ NEET UG 2024
Among Group 16 elements, which one does NOT show -2 oxidation state?
Read answer →Chemistry · PYQ NEET UG 2022
Copper crystallises in fcc unit cell with cell edge length of \( 3.608 \times 10^{-8}\text{ cm} \). The density of copper is \( 8.92\text{ g cm}^{-3} \). Calculate the atomic mass of copper.
Read answer →Chemistry · Structure of atom
What is the wavelength of a photon emitted during a transition from \( n = 5 \) state to the \( n = 2 \) state in a hydrogen atom?
Read answer →Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE
Which combination of enthalpy characteristics most easily favors the formation of an electrovalent (ionic) bond between two elements?
Read answer →Chemistry · CHEMICAL BONDING AND MOLECULAR STRUCTURE
Which of the following molecules has a shape primarily governed by \( sp^2 \) hybridization with a bond angle of \( 120^\circ \)?
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): Cathode rays travel in straight lines in the absence of an electrical or magnetic field. Reason (R): Cathode rays consist of negatively charged particles called electrons. In the light of the above statements, choose the correct answer from the options given below:
Read answer →Chemistry · EQUILIBRIUM
