Test21
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A substance AxBy crystallizes in a face centred cubic (fcc) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centres of each face of the cube. Identify the correct composition of the substance

Test21
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The arrangement of X- ions around A+ io in solid AX is given in the figure (not drawn to scale). If the radius of X- is 250 pm, the radius of A+ is

Test73
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Which one of the following pairs of substances on reaction will not evolve H2 gas? 

Test74
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The graph shows the behaviour of a length of wire in the region for which the substance obeys Hooke’s law. P and Q represent

Test78
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A Substance ‘A’ decomposes by a first order reaction starting initially with [A] = 2.00 m and after 200 min, [A] becomes 0.15 m. For this reaction t1/2 is [1995]

Test84
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A Substance ‘A’ decomposes by a first order reaction starting initially with [A] = 2.00 m and after 200 min, [A] becomes 0.15 m. For this reaction t1/2 is [1995]

Test85
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Substances whose solutions can readily diffuse through parchment membrane are

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The substance used a smoke screen in warfare is [AIPMT 1989]

Test94
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The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is

Test94
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Which of the following is least reactive a nucleophilic substitution reaction?

Test94
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Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

Test77
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Amount of Substance is a fundamental quantity . It is defined using mass of carbon-14 isotope.

Test116
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A pure crystalline substance on being heated gradually first forms a turbidity completely disappears. The behavior is a characteristic of substance forming.

Test123
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The substrate for photorespiration is                                     (1989)

Test130
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Respiratory substrate yielding maximum number of ATP molecule is                       (1994)

Test13
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O.24 g of a volatile gas, upon vaporization, gives 45 ML vapour at NTP. What will be the vapour density of the substance?       (Density of H2 = 0.089)                 

Test143
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For preparing 0.1 N solution of a compound from its impure sample of which the percentage purity is known, the weight of the substance required will be

Test153
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In the chemistry of vision in mammals, the photosensitive substance is called                                                             &

Test158
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The ability of a substance to assume in two or more crystalline structures is called

Test158
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The substance used a smoke screen in warfare is

Test159
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Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

Test159
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The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is

Test159
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Which of the following is least reactive a nucleophilic substitution reaction?

Test167
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The existence of a substance in more than one solid modifications is known as

Test167
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A substance AxBy crystallizes in a face centred cubic (FCC) lattice in which atoms ‘A’ occupy each corner of the cube and atoms ‘B’ occupy the centres of each  face of the cube. Identify the correct composition of the substance AxB

Test167
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The pure crystalline substance on being heated gradually first forms a turbid liquid at constant temperature and still at higher temperature turbidity completely disappears. The behavior is a characteristic of substance forming.

Test167
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The existence of a substance in more than one solid modifications is known as

Test168
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Aniline is an activated system for electrophilic substitution. The compound formed on heating aniline with acetic anhydride is

Test168
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The decomposition of organic compounds, in the presence of oxygen and without the development of odoriferous substances, is called

Test171
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The existence of a substance in more than one solid modifications is known as

Test174
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A Substance ‘A’ decomposes by a first order reaction starting initially with [A] = 2.00 m and after 200 min, [A] becomes 0.15 m. For this reaction t1/2 is

Test175
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A Substance ‘A’ decomposes by a first order reaction starting initially with [A] = 2.00 m and after 200 min, [A] becomes 0.15 m. For this reaction t1/2 is

Test180
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A strong base can abstract an α-hydrogen from

Test184
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The ability of a substance to assume in two or more crystalline structures is called [AIPMT 1990]

Test186
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Current flows due north in a horizontal transmission line. Magnetic field at a point P vertically above it directed

Test189
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If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic  mass unit, the mass of one mole of the substance will

Test68
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The organisms attached to the substratum, generally, possess

Test197
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Find the position of point from wire 'B' where net magnetic field is zero due to following current distribution

Test211
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Figure shows the cress sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance 3R/2

Test211
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A wire abc is carrying current i. It is bent as shown in fig and is placed in a uniform magnetic field of magnetic induction B. Length ab = l and Ð abc = 45o. The ratio of force on ab and on bc is

Test212
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Find magnetic field at centre O in each of the following figure

Test214
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The magnetic moment produced in a substance of 1gm is 6 x 10-7ampere-metre2. If its density is 5gm/cm3, then the intensity of magnetisation in A/m will be

Test214
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Earth's magnetic field may be supposed to be due to a small bar magnet located at the centre of the earth. If the magnetic field at a point on the magnetic equator is 0.3×10–4 T. Magnet moment of bar magnet is

Test215
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A ferromagnetic substance of volume 10–3 m3 is placed in an alternating field of 50 Hz. Area of hysteresis curve obtained is 0.1 M.K.S. unit. The heat produced due to energy loss per second in the substance will be

Test215
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A magnetising field of 2000 A/m produces a flux 6.28 x 10-4 weber in a rod. If the area of cross-section is 2 x 10-5m2. Then the relative permeability of the substance is

Test216
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The ratio of the area of B-H curve and I-H curve of a substance in M.K.S. system is

Test218
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The ratio of the area of B-H curve and I-H curve of a substance in M.K.S. system is

Test220
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Earth's magnetic field may be supposed to be due to a small bar magnet located at the centre of the earth. If the magnetic field at a point on the magnetic equator is 0.3×10–4 T. Magnet moment of bar magnet is

Test220
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A ferromagnetic substance of volume 10–3 m3 is placed in an alternating field of 50 Hz. Area of hysteresis curve obtained is 0.1 M.K.S. unit. The heat produced due to energy loss per second in the substance will be

Test221
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The magnetic moment produced in a substance of 1gm is 6 x 10-7ampere-metre2. If its density is 5gm/cm3, then the intensity of magnetisation in A/m will be

Test221
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A magnetising field of 2000 A/m produces a flux 6.28 x 10-4 weber in a rod. If the area of cross-section is 2 x 10-5m2. Then the relative permeability of the substance is

Test232
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If specific heat of a substance is infinite, it means

Test228
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The latent heat of vaporization of a substance is always:

Test228
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If specific heat of a substance is infinite, it means

Test255
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Three particles A, B and C of equal mass are moving with the same velocity v along the medians of an equilateral triangle. These particle collide at the centre G of triangle. After collision A becomes stationary, B retraces its pat

Test259
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Adsorption is the phenomenon in which a substance

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Adsorption is the phenomenon in which a substance

Test270
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The relationship between force and position is shown in the figure given (in one dimensional case). The work done by the force in displacing a body from x=1 cm to x= 5 cm is

Test268
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If each resistance in the figure is of 9 ? then reading of ammeter is        

Test280
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Figure shows the cress sectional view of the hollow cylindrical conductor with inner radius 'R' and outer radius '2R', cylinder carrying uniformly distributed current along it's axis. The magnetic induction at point 'P' at a distance

Test282
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The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately

Test282
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Light of frequency 8×1015Hz is incident on a substance of photoelectric work function 6.125 eV. The maximum kinetic energy of the emitted photoelectrons

Test287
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The mean lives of a radioactive substance for ∝ and β emissions are 1620 years and 405 years respectively. After how much time will the activity be reduced to one fourth

Test287
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From a newly formed radioactive substance (Half-life 2 hours), the intensity of radiation is 64 times the permissible safe level. The minimum time after which work can be done safely from this source is

Test287
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At any instant the ratio of the amount of radioactive substances is 2 : 1. If their half lives be respectively 12 and 16 hours, then after two days, what will be the ratio of the substances

Test287
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A radioactive substance decays to 1/16th of its initial activity in 40 days. The half-life of the radioactive substance expressed in days is

Test289
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For the construction of nuclear-bomb which of the following substances is taken      

Test289
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A radioactive substance emits

Test300
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In a U-tube the radii of two columns are respectively r1 and r2 and if a liquid of density d filled in it has level difference of h then the surface tension of the liquid is

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