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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
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90.1k
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3
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Which of the following statements is not true for the reaction \(2 \mathrm{~F}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HF}+\mathrm{O}_{2} ?\)
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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3
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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\(\mathrm{K}_{\mathrm{t}}\) (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
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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3
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An ideal gas expands adiabatically against vaccum. Which of the following is correct for the given process? (A) \(\Delta S=0\)
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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0
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2
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\(5 \mathrm{ml}\) 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
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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0
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1
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The mole fraction of ethanol in water is \(0.08\). Its molality is
asked
Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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3
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Among the following, the ion which will be more effective for flocculation of \(\mathrm{Fe}(\mathrm{OH})_{3}\) sol. is
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Dec 11, 2021
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Some basic concepts in chemistry
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kritika
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90.1k
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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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
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Dec 11, 2021
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Some basic concepts in chemistry
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45
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For the following carbocations the correct order of stability is
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Dec 11, 2021
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Some basic concepts in chemistry
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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 ?
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Dec 11, 2021
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Kinematics
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90.1k
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A \(400 \Omega\) resistor, a \(250 \mathrm{mH}\) inductor and a \(2.5 \mu \mathrm{F}\) capacitor are connected in series with an \(\mathrm{AC}\) source of peak voltage \(5 \mathrm{~V}\) and angular frequency \(2 \mathrm{kHz}\). What is the peak value of the electrostatic energy of the capacitor?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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92
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A simple pendulum of length \(\ell\) is displaced so that its taught string is horizontal and then released. A uniform bar pivoted at one end is simultaneously released from its horizontal position. If their motions are synchronous, what is the length of the bar?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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3
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Two metallic spheres of equal outer radii are found to have same moment of inertia about their respective diameters. Then which of the following statement(s) is/are true ?
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Dec 11, 2021
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Kinematics
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kritika
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90.1k
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A point source of light is used in an experiment of photo-electric effects. If the distance between the source and the }{ photo-electric surface is doubled, which of the following may result? }
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Dec 11, 2021
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Kinematics
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kritika
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Two pith balls, each carrying charge \(+q\) are hung from a hook by two strings. It is found that when each charge is tripled, angle between the strings double. What was the initial angle between the strings ?
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Dec 11, 2021
in
Kinematics
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kritika
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90.1k
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