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The most reactive compound among the following toward electrophilic aromatic substitution reaction is:
The efficiency of a fuel cell is given by:
The number of Faradays (F) required to produce $20 \text{ g}$ of calcium from molten $\text{CaCl}_2$ (Atomic mass of Ca = $40 \text{ g mol}^{-1}$) is:
Isotonic solutions have the same:
The correct sequence of increasing radii is:
pH of a saturated solution of $Ca(OH)_2$ is 9. The solubility product ($K_{sp}$) of $Ca(OH)_2$ is:
Which one of the following ions is the most stable in aqueous solution? (At no. Ti=22, V=23, Cr=24, Mn=25)
Which of the following series of transitions in the spectrum of hydrogen atoms falls in the visible region?
Which one of the following electrons in the ground state will have the least amount of energy?
Which one of the following compounds will be most readily dehydrated?
The number of protons, neutrons and electrons in $^{175}_{71}\text{Lu}$, respectively, are:
Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?
Which one of the following represents all isoelectronic species?
Calculate the energy in Joule corresponding to light of wavelength 45 nm: (Planck's constant h = 6.63 × 10⁻³⁴ Js; speed of light c = 3 × 10⁸ ms⁻¹)
What is the correct family and electronic configuration for element Z = 114?
The total number of atomic orbitals in fourth energy level of an atom is:
An element X has the following isotopic composition: $^{200}$X: 90% $^{199}$X: 8.0% $^{202}$X: 2.0% The weighted average atomic mass of the naturally-occurring element X is closest to:
Fructose reduces Tollen's reagent due to:
Aniline gives a set of the following reactions that yielded a coloured product 'Y'. The structure of 'Y' is: (Note: Reaction scheme is missing from the provided text)
Uncertainty in position of an electron ($e^-$) and Helium atom (He) is similar. If uncertainty in momentum of electron is $32 \times 10^5$, then uncertainty in momentum of Helium will be: