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A buffer solution is prepared in which the concentration of \(\mathrm{NH}_{3}\) is \(0.30 \mathrm{M}\) and the concentration of \(\mathrm{NH}_{4}^{+}\)is \(0.20 \mathrm{M}\). If the equilibrium constant, \(\mathrm{K}_{\mathrm{b}}\) for \(\mathrm{NH}_{3}\) equals \(1.8 \mathrm{x}\) \(10^{-5}\), what is the pH of this solution? ( \(\log 2.7=0.43\) )

asked Dec 20, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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A closely wound solenoid of 800 turns and area of cross section \(2.5 \times 10^{-4} \mathrm{~m}^{2}\) carries a current of \(3.0 \mathrm{~A}\). Explain the sense in which the solenoid acts like a bar magnet. What is its associated magnetic moment?

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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Which of the following is not related to an application software?

asked Dec 20, 2021 in Computer by kritika (90.1k points)

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A stone tied to a string of length \(L\) is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position and has a speed \(u\). The magnitude of the change in its velocity as it reaches a position where the string is horizontal is

asked Dec 20, 2021 in Kinematics by kritika (90.1k points)

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A charged particle of mass \(m\) and charge \(q\) is released from rest in an electric field of constant magnitude E. The kinetic energy of the particle after time t is :-

asked Dec 20, 2021 in Kinematics by kritika (90.1k points)

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Define 1 dioptre of power of a lens.

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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\(\mathrm{KF}\) combines with \(\mathrm{HF}\) to form \(\mathrm{KHF}_{2}\). This compound contains the species

asked Dec 20, 2021 in Some basic concepts in chemistry by kritika (90.1k points)

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OB Helps to understand behaviour of human in _____.

asked Dec 20, 2021 in Home Science by kritika (90.1k points)

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The small pictures on the desktop are called icons

asked Dec 20, 2021 in Computer by kritika (90.1k points)

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Write the applications of computer?

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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Paper has more patience than people.

asked Dec 20, 2021 in English by kritika (90.1k points)

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The boat goes 30 km upstream and 44 km downstream in 10 hours. In 13 hours, it can go 40 km upstream and 55 km downstream. Determine the speed of stream and that of the boat in still water.

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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Mention the significance of zeroth law of thermodynamics

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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One mole of an ideal monatomic gas undergoes a process described by the equation PV \(^{3}=\) constant. The heat capacity of the gas during this process is

asked Dec 20, 2021 in Kinematics by kritika (90.1k points)

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"Money cannot buy all the goods and services that one needs to live well" Do you agree with this statement? Justify your answer with any three suitable arguments.

asked Dec 20, 2021 in English by kritika (90.1k points)

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What are the limitations of Ohm’s law?

asked Dec 20, 2021 in CBSE by kritika (90.1k points)

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Explain the importance of conservation of resources.

asked Dec 20, 2021 in Social Science by kritika (90.1k points)

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Two identical photocathodes receive light of frequencies \(f_{1}\) and \(f_{2}\). If the velocities of the photoelectrons (of mass \(m\) ) coming out are respectively \(v_{1}\) and \(v_{2}\), then

asked Dec 20, 2021 in Kinematics by kritika (90.1k points)

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\(\int \cos m x \cos n x d x, m \neq n\)

asked Dec 20, 2021 in Sets, relations and functions by kritika (90.1k points)

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Two beams of light having intensities \(I\) and 41 interfere to produce a fringe pattern on a screen. (The phase difference between beam is ( \(\pi / 2)\) at the point \(A\) and \(\pi\) at point B.)

asked Dec 20, 2021 in Kinematics by kritika (90.1k points)

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