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\(\mathrm{Cl}_{2} \mathrm{O}_{7}\) is the anhydride of

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\(\mathrm{SiO}_{2}\) is attacked by which one / ones of the following?

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Which of the following statement(s) is/are incorrect:

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For spontaneous polymerization, which of the following is (are) correct?

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\(\mathrm{CH}_{3}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{Cl} \stackrel{\mathrm{aq}^{-1-1 \mathrm{OH}}}{\rightarrow} \mathrm{CH}_{3}-\mathrm{O}-\mathrm{CH}_{2}-\mathrm{OH}\) Which information below regarding this reaction is applicable?

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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A homonuclear diatomic gas molecule shows 2-electron magnetic moment. The one-electron and two-electron reduced species obtained from above gas molecule can act as both oxidizing and reducing agents. When the gas molecule is one-electron oxidized the bond length decreases compared to the neutral molecule. The gas molecule is

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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A solution is saturated with \(\mathrm{SrCO}_{3}\) and \(\mathrm{SrF}_{2} .\) The \(\left[\mathrm{CO}_{3}{ }^{2-}\right]\) is found to be \(1.2 \times 10^{-3} \mathrm{M}\). The concentration of \(\mathrm{F}\) - in the solution would be

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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For a reaction \(2 \mathrm{~A}+\mathrm{B} \rightarrow \mathrm{P}\), when concentration of \(\mathrm{B}\) alone is doubled, \(\frac{\mathrm{t}_{1}}{2}\) does not change and when concentrations of both \(A\) and \(B\) is doubled, rate increases by a factor of 4 . The unit of rate constant is,

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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The total number of alkyl bromides (including stereoismers) formed in the reaction \(\mathrm{Me}_{3} \mathrm{C}-\mathrm{CH}=\mathrm{CH}_{2}+\mathrm{HBr} \rightarrow\) will be

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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In the extraction of \(\mathrm{Ca}\) by electro reduction of molten \(\mathrm{CaCl}_{2}\) some \(\mathrm{CaF}_{2}\) is added to the electrolyte for the following reason:

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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The reaction for obtaining the metal (M) from its oxide \(\left(\mathrm{M}_{2} \mathrm{O}_{3}\right)\) ore is given by \(\mathrm{M}_{2} \mathrm{O}_{3}(\mathrm{~s})+2 \mathrm{Al}(\ell) \stackrel{\mathrm{Heat}}{\longrightarrow} \mathrm{Al}_{2} \mathrm{O}_{3}(\ell)+2 \mathrm{M}(\mathrm{s}),(\mathrm{s}=\) solid, \(\ell=\) liquid \()\) in that case, \(M\) is

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To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green when the colourless gas is passed through it. The sodium salt is

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Bond order of \(\mathrm{He}_{2}, \mathrm{He}_{2}^{+}\)and \(\mathrm{He}_{2}^{2+}\) are respectively:

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What will be the mass of one atom of \({ }^{12} \mathrm{C}\) ?

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Which of the following has the largest number of atoms?

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The difference between orbital angular momentum of an electron in a 4 f orbital and another electron in a 4 s orbital is

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How and why does the density of liquid water change on prolonged electrolysis?

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The number of unpaired electrons in the uranium \(\left({ }_{92} \mathrm{U}\right)\) atom is:

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Which of the following statements is not true for the reaction \(2 \mathrm{~F}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HF}+\mathrm{O}_{2} ?\)

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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The radius of the first Bohr orbit of a hydrogen atom is \(0.53 \times 10^{-8} \mathrm{~cm}\). The velocity of the electron in the first Bohr orbit is

asked Dec 11, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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