Answers by kritika

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\(\mathrm{PbCl}_{2}\) is insoluble in cold water. Addition of \(\mathrm{HCl}\) increases its solubility due to

answered Dec 14, 2021 in Some basic concepts in chemistry

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Which of the following atoms should have the highest"telectron affinity?

answered Dec 14, 2021 in Some basic concepts in chemistry

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The ground state magnetic property of Bzand C \(_{2}\) molecules will be

answered Dec 14, 2021 in Some basic concepts in chemistry

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Dissolving NaCN in de-ionized water will result in a solution having

answered Dec 14, 2021 in Some basic concepts in chemistry

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\(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~F}^{18}\) is a \(\mathrm{F}^{8}\) radio-isotope labelled organic compound. \(\mathrm{P}^{8}\) decays by positron emission. the product resulting or decay is

answered Dec 14, 2021 in Some basic concepts in chemistry

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In a flask, the weight ratio of \(\mathrm{CH}(\mathrm{g})\) and \(\mathrm{SO}_{2}(\mathrm{~g})\) at \(298 \mathrm{~K}\) and 1 bar is \(1: 2\). The ratio of the number of molecules off \(\mathrm{SO}_{2}(\mathrm{~g})\) and \(\mathrm{CH}_{4}(\mathrm{~g})\) is

answered Dec 14, 2021 in Some basic concepts in chemistry

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\(0.126 \mathrm{~g}\) of an acid is needed to completely neutralize \(20 \mathrm{ml} 0.1\) (N) NaOH solution. The equivalent weight of the acid is

answered Dec 14, 2021 in Some basic concepts in chemistry

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Which of the following sets of quantum numbers represents the Electron of \(\mathrm{Cr}(\mathrm{Z}=24) ?\)

answered Dec 14, 2021 in Some basic concepts in chemistry

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If the given four electronic configurations (i) \(n=4, l=1\) (ii) \(\mathrm{n}=4, l=0\) (iii) \(\mathrm{n}=3, l=2\) (iv) \(\mathrm{n}=3, l=1\) are arranged in order of increasing energy, then the order will be

answered Dec 14, 2021 in Some basic concepts in chemistry

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Which of the following has the dimension of \(\mathrm{ML}^{0} \mathrm{~T}^{-2}\) ?

answered Dec 14, 2021 in Kinematics

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A small steel ball bounces on a steel plate held horizontally. On each bounce the speed of the ball arriving at the plate is reduced by a factor e (coefficient of restitution) in the rebound, so that $$ \mathrm{V}_{\text {upward }}=\mathrm{eV}_{\text {downward }} $$ If the ball is initially dropped from a height of \(0.4 \mathrm{~m}\) above the plate and if 10 seconds later the bouncing ceases, he value of \(e\) is

answered Dec 14, 2021 in Kinematics

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Let \(v_{n}\) and \(E_{n}\) be the respective speed and energy of an electron in the horbit of radius \(r_{n}\), in a hydrogen atom, as predicted by Bohr's model. Then

answered Dec 14, 2021 in Kinematics

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If \(\chi\) stands for the magnetic susceptibility of a substance,for its magnetic permeability and \(\mu_{0}\) for the permeability of free space, then

answered Dec 14, 2021 in Kinematics

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If the pressure, temperature and density of an ideal gas are denoted by \(\mathrm{P}, \mathrm{T}\) ancespectively, the velocity of sound in the gas is

answered Dec 14, 2021 in Kinematics

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A bullet of mass \(4.2 \times 10^{2} \mathrm{~kg}\), moving at a speed of \(300 \mathrm{~ms}\), gets stuck into a block with a mass 9 times that of th bullet. If the block is free to move without any kind of friction, the heat generated in the process will be

answered Dec 14, 2021 in Kinematics

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A block of mass \(1 \mathrm{~kg}\) starts from rest at \(\mathrm{x}=0\) and moves along the \(\mathrm{x}\)-axis under the action of a force \(\mathrm{F}=\mathrm{kt}\), where is time and \(k=1 \mathrm{Ns}^{-1}\). The distance the block will travel in 6 seconds is

answered Dec 14, 2021 in Kinematics

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Three vectors \(\vec{A}=a \vec{i}+\vec{j}+k ; B=\vec{i}+b \vec{j}+k\) and \(\vec{C}=\vec{i}+j+c \vec{k}\) are mutually perpendicular \((\vec{i}, \vec{j}\) and \(\vec{k}\) are unit vectors along \(X, Y\) and \(Z\) axis respectively \() .\) The respective values of a, b and c are

answered Dec 14, 2021 in Kinematics

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Two particles \(A\) and \(B\) (both initially at rest) start moving towards each other under a mutual force of attraction. A the instant when the speed of \(A\) is \(v\) and the speed of \(B\) is \(2 v\), the speed of the centre of mass is

answered Dec 14, 2021 in Kinematics

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The dimension of the universal constant of gravitation \(G\) is

answered Dec 14, 2021 in Kinematics

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When a semiconducting device is connected in series with a battery and a resistance, a current is found to flow in the circuit. If, however, the polarity of the battery is reversed, practically no current flows in the circuit. The device may be

answered Dec 14, 2021 in Kinematics

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