Recent questions tagged 2010

The correct order of increasing bond angles in the following species is:

asked Jul 26, 2018 by pady_1

1 answer

Which of the following statements about primary amines is 'False'?

asked Jul 26, 2018 by pady_1

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Oxidation states of P in $H_4P_2O_5,H_4P_2O_6,H_4P_2O_7$, are respectively:

asked Jul 26, 2018 by pady_1

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Aniline in a set of the following reactions yielded a coloured product 'Y'. <img src="/>

asked Jul 26, 2018 by pady_1

2 answers

Which of the following ions will exhibit colour in aqueous solutions?

asked Jul 26, 2018 by pady_1

1 answer

In which of the following equilibrium $K_c$and$ K_p$ are not equal?

asked Jul 26, 2018 by pady_1

1 answer

For the reduction of silver ions with copper metal, the standard cell potential was found to be + 0.46 V at 25°C. The value of standard Gibbs energy. ?G° will be (F = 96500 C mol–1).

asked Jul 26, 2018 by pady_1

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The correct order of increasing reactivity of Câ€“X bond towards nucleophile in the following compounds is: <br>

asked Jul 26, 2018 by pady_1

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The reaction of toluene with $Cl_2$ in presence of $FeCl_3$ gives 'X' and reaction in presence of light gives 'Y'. Thus, 'X' and 'Y' are

asked Jul 26, 2018 by pady_1

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If pH of a saturated solution of $Ba(OH)_2$ is 12, the value of its $K_{(SP)}$ is

asked Jul 26, 2018 by pady_1

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Given are cyclohexanol (I), acetic acid (II) 2,4,6- trinitrophenol (III) and phenol (IV). In these the order of decreasing acidic character will be

asked Jul 26, 2018 by pady_1

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Which of the following complex ion is not expected to absorb visible light?

asked Jul 26, 2018 by pady_1

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Which one of the following species does not exist under normal conditions?

asked Jul 26, 2018 by pady_1

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Which one of the following does not exhibit the phenomenon of mutarotation?

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In which of the following pairs of molecules/ ions, the central atoms have $sp^2$ hybridization?

asked Jul 26, 2018 by pady_1

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Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

asked Jul 26, 2018 by pady_1

1 answer

A series combination of $n_1$ capacitors, each of value $C_1$ , is charged by a source of potential difference 4V. When another parallel combination of $n_2$ capacitors, each of value $C_2$, is charged by a source of potential difference V, it is has the same (total) energy stored in it, as the first combination has. The value of $C_2$, in terms of $C_1$, is then –

asked Jul 26, 2018 by pady_1

1 answer

A square surface of side L meter in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same plane at an angle $\theta$ with the horizontal side of the square as shown in figure. The electric flux linked to the surface, in units of volt-m, is <br>

asked Jul 26, 2018 by pady_1

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The potential difference that must be applied to stop the fastest photo electrons emitted by a nick surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be

asked Jul 26, 2018 by pady_1

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Two positive ions, each carrying a charge q, are separated by a distance d. If F is the force of repulsion between the ions, the number of electrons missing from each ion will be (e being the charge on an electron) – 4?? 2

asked Jul 26, 2018 by pady_1

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A vibration magnetometer placed in magnetic meridian has a small bar magnet. The magnet executes oscillations with a time period of 2 sec in earth's horizontal magnetic field of 24 microtesla. When a horizontal field of 18 microtesla is produced opposite to the earth's field by placing a current carrying wire, the new time period of magnet will be –

asked Jul 26, 2018 by pady_1

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A lens having focal length f and aperture of diameter d forms an image of intensity I. Aperture of diameter $\frac{d}{2}$ in central region of lens is covered by a black paper. Focal length of lens and intensity of image now will be respectively –

asked Jul 26, 2018 by pady_1

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An alpha nucleus of energy $\frac{1}{2} mv^2$ bombards a 2 heavy nuclear target of charge Ze. Then the distance of closest approach for the alpha nucleus will be proportional to –

asked Jul 26, 2018 by pady_1

1 answer

A man of 50 kg mass is standing in a gravity free space at a height of 10 m above the floor. He throws a stone of 0.5 kg mass downwards with a speed 2 m/s. When the stone reaches the floor, the distance of the man above the floor will be –

asked Jul 26, 2018 by pady_1

1 answer

In producing chlorine by electrolysis 100 kW power at 125 V is being consumed. How much chlorine per minute is liberated (E.C.E. of chlorine is $0.367 \times10^{–6}$ kg/C) –

asked Jul 26, 2018 by pady_1

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The dimension of $\frac {1}{2}\epsilon_0 E^2$ , where $\epsilon_0$ is permittivity of free space and E is electric field, is –

asked Jul 26, 2018 by pady_1

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The energy of a hydrogen atom in the ground state is – 13.6 eV. The energy of $He^{+}$ ion in the first excited state will be –

asked Jul 26, 2018 by pady_1

1 answer

A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a string of a piano. The beat frequency decreases to 2 beats per second, when the tension in the piano string is slightly increased. The frequency of the piano string before increasing the tension was –

asked Jul 26, 2018 by pady_1

1 answer

A potentiometer circuit is set up as shown. The potential gradient across the potentiometer wire, is k volt/cm and the ammeter, present in the circuit, reads 1.0 A when two way key is switched off. The balance points, when the key between the terminals (i) 1 and 2 (ii) 1 and 3, is plugged in, are found to be at lengths $l_1$cm and $l_2$ cm respectively. The magnitudes, of the resistors R and X, in ohms, are then, equal respectively to <br>

asked Jul 26, 2018 by pady_1

1 answer

The device that can act as a complete electronic circuit is –

asked Jul 26, 2018 by pady_1

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A thin ring of radius R meter has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolutions/s. The value of magnetic induction in $Wb/m^2$ at the centre of the ring is –

asked Jul 26, 2018 by pady_1

1 answer

An engine pumps water through a hose pipe. Water passes through the pipe and leaves it with a velocity of 2 /s. The mass per unit length of water in the pipe is 100 kg/m. What is the power of the engine –

asked Jul 26, 2018 by pady_1

1 answer

A particle has initial velocity (3i + 4j) and has acceleration (0.4i + 0.3j).Its speed after 10 s is –

asked Jul 26, 2018 by pady_1

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A transverse wave is represented by y = A sin ($\omega t -Kx$). For what value of the wavelength is the wave velocity equal to the maximum particle velocity –

asked Jul 26, 2018 by pady_1

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A ball moving with velocity 2m/s collides head on with another stationary ball of double the mass. If the coefficient of restitution is 0.5, th their velocities (in m/s) after collision will be –

asked Jul 26, 2018 by pady_1

1 answer

A cylindrical metallic rod in thermal contact with two reservoirs of heat at its two ends conducts a amount of heat Q in time t. The metallic rod is melted and the material is formed into a rod of half the radius of the original rod. What is the amount of heat conducted by the new rod, when placed in thermal contact with the two reservoirs in time t ?

asked Jul 26, 2018 by pady_1

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A circular disk of moment of inertia it is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed $\omega_i$ Another disk of moment of inertia $I_b$ is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed $\omega_f$ . The energy lost by the initially rotating disc to friction is –

asked Jul 26, 2018 by pady_1

1 answer

The mass of a $^7_3$ Li nucleus is 0.042 u less than the sum of the masses of all its nucleons. The binding energy per nucleon of $^7_3$ Li nucleus is nearly –

asked Jul 26, 2018 by pady_1

1 answer