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

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

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1 answer

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

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

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3 answers

Which of the following has the largest number of atoms?

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

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62 answers

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

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

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

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

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2 answers

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

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

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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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1 answer

\(\mathrm{K}_{\mathrm{t}}\) (water) \(=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\). The temperature at which ice begins to separate from a mixture of 10 mass \(\%\) ethylene glycol is

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

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An ideal gas expands adiabatically against vaccum. Which of the following is correct for the given process? (A) \(\Delta S=0\)

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

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1 answer

Equal masses of ethane and hydrogen are mixed in a empty container at \(298 \mathrm{~K}\). The fraction of total pressure exerted by hydrogen is

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

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3 answers

At \(273 \mathrm{~K}\) temperature and \(76 \mathrm{~cm} \mathrm{Hg}\) pressure, the density of a gas is \(1.964 \mathrm{gL}^{-1}\). The gas is

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

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2 answers

\(5 \mathrm{ml}\) of \(0.1 \mathrm{M} \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}\) is mixed with \(10 \mathrm{ml}\) of \(0.02 \mathrm{M} \mathrm{KI}\). The amount of Pbl \(_{2}\) precipitated will be about

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

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1 answer

The mole fraction of ethanol in water is \(0.08\). Its molality is

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

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3 answers

Among the following, the ion which will be more effective for flocculation of \(\mathrm{Fe}(\mathrm{OH})_{3}\) sol. is

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

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3 answers

The equilibrium constant for the following reactions are given at \(25^{\circ} \mathrm{C}\) $$ \begin{aligned} &2 A \rightleftharpoons B+C, K_{1}=1.0 \\ &2 B \rightleftharpoons C+D, K_{2}=16 \\ &2 C+D \rightleftharpoons 2 P, K_{3}=25 \end{aligned} $$ The equilibrium constant for the reaction \(\mathrm{P} \rightleftharpoons \mathrm{A}+\frac{1}{2} \mathrm{~B}\) at \(25^{\circ} \mathrm{C}\) is

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

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In the face-centred cubic lattice structure of gold the closest distance between gold atoms is 'a' being the edge ength of the cubic unit cell

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

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The maximum number of electrons in an atom in which the last electron filled has the quantum numbers \(n=3, I=2\) and \(m=-1\) is

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

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45 answers

For the following carbocations the correct order of stability is

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

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A charged particle moves with constant velocity in a region where no effect of gravity is felt but an electrostatic field \(\vec{E}\) together with a magnetic field \(\vec{B}\) may be present. Then which of the following cases are possible ?

asked Dec 11, 2021 in Kinematics by kritika (90.1k points)

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