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Recent questions tagged 2012
Questions
Which reaction produces $SO_2$?
jeemain
eamcet
chemistry
2012
q150
asked
Oct 24, 2013
by
thanvigandhi_1
0
answers
An oxide of nitrogen (X) is formed when Z is reacted with $P_2O_5$. X is soluble in water and gives Z. Which one of the following is Z?
jeemain
eamcet
chemistry
2012
q149
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
The reaction that gives $CO_2$ as one of the product is
jeemain
eamcet
chemistry
2012
q148
asked
Oct 24, 2013
by
thanvigandhi_1
0
answers
Which of the following statements are correct?
jeemain
eamcet
chemistry
2012
q147
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
The reaction which does not liberate hydrogen is
jeemain
eamcet
chemistry
2012
q146
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
Which one of the following reactions does not correspond to the preparation of "synthetic gasoline" during the Fischer-Tropsch process?
jeemain
eamcet
chemistry
2012
q145
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
Enthalpy of chemical absorption, $ \Delta\: H$ in $kJ\: mol^{-1}$ is in the range of
jeemain
eamcet
chemistry
2012
q144
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
For a reaction to be spontaneous at all temperatures
jeemain
eamcet
chemistry
2012
q143
asked
Oct 24, 2013
by
thanvigandhi_1
1
answer
The solubility product, $K_{sp}\: of Ag_2\: CrO_4$ is $ 3.2 \times 10^{-11}\: at T(K)$ . Its solubility in mol $ L^{-1}$ is
jeemain
eamcet
chemistry
2012
q142
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
The degree of dissociation of $N_2O_4$ in
jeemain
eamcet
chemistry
2012
q141
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
The half life period of a first order radioactive decay of an element is 5 days. The time ( in days ) taken for 8 g of this element to decay to 1 g is
jeemain
eamcet
chemistry
2012
q140
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
The distance in pico metres between centres of two closest sodium atoms in the body centred cubic lattice of sodium metal with a unit cell length of $4.3 \: A$ is
jeemain
eamcet
chemistry
2012
q139
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
Cell constant of a conductivity cell is
jeemain
eamcet
chemistry
2012
q138
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
Match the following
jeemain
eamcet
chemistry
2012
q137
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
$ \alpha - D(+)-\: and \: \beta -D\: (+)-$ glucopyranoses are known as
jeemain
eamcet
chemistry
2012
q136
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
The structure of bakelite is
jeemain
eamcet
chemistry
2012
q135
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
In the Hofmann mustard oil reaction of primary amines, the black precipitate is due to
jeemain
eamcet
chemistry
2012
q134
asked
Oct 23, 2013
by
thanvigandhi_1
1
answer
Whar are A,B and C in the reaction?
jeemain
eamcet
chemistry
2012
q133
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
What are A and B ?
jeemain
eamcet
chemistry
2012
q132
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
Identify the reagents A and B used in the following reactions
jeemain
eamcet
chemistry
2012
q131
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
From the following dipole moment ( in Debye) values of methyl halides, identify the value of $CH_3 - F$.
jeemain
eamcet
chemistry
2012
q130
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
What is the correct Fischer projection of (R) 2-hydroxy propanoic acid?
jeemain
eamcet
chemistry
2012
q129
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
Identify A,B and C in the following reactions
jeemain
eamcet
chemistry
2012
q128
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
The energy difference $( in\: Kcal\: mol^{-1})$ between the staggered and eclipsed conformations of ethane is
jeemain
eamcet
chemistry
2012
q127
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
The stationary phase in paper chromatography is
jeemain
eamcet
chemistry
2012
q126
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
The pair of chemicals that maintain heat balance in troposphere are
jeemain
eamcet
chemistry
2012
q125
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
In the electrolysis of alumina using cryolite, the reaction that takes place at cathode is
jeemain
eamcet
chemistry
2012
q124
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
In the reaction
jeemain
eamcet
chemistry
2012
q123
asked
Oct 21, 2013
by
thanvigandhi_1
1
answer
The number of lone pairs of electrons on $Xe\: in\: XeF_2, XeF_4\: and \: XeF_6$ are, respectively
jeemain
eamcet
chemistry
2012
q122
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
Chlorine reacts with ammonia and gives nitrogen. The ratio of chlorine to ammonia in this reaction is
jeemain
eamcet
chemistry
2012
q121
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A conductor has a non-uniform section as shown in the figure. A steady current is flowing through it. Then the drift speed of the electrons
jeemain
eamcet
physics
2012
q120
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The thermo emf in lead-iron thermocouple with one junction at $0^{\circ}C$ , is given by $e=1784t-bt^2$ in volts, where $t^{\circ}C$ is the temperature of the other junction. The neutral temperature is $371.7^{\circ}C$. Then the value of b in $V/(^{\circ}C)^2$ is
jeemain
eamcet
physics
2012
q119
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A long straight wire along the Z-axis carries a current 'I' in the negative Z-direction . The induced magnetic field B at a point having coordinates (x,y) is
jeemain
eamcet
physics
2012
q118
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The deflection of the magnetic needle in an tangent galvanometer is $30^{\circ}$ when a current of one ampere flows through it. The deflection of the magnetometer when a current of 4 amp flows through it is
jeemain
eamcet
physics
2012
q117
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The X-ray spectrum coming from an X-ray tube
jeemain
eamcet
physics
2012
q116
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The de-Broglie wavelength of a free electron with kinetic energy 'E' is $ \lambda$. If the kinetic energy of the electron is doubled, the de-Broglie wavelength is
jeemain
eamcet
physics
2012
q115
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A radioactive substance has density $ \rho$ , volume V, and decay constant $ \lambda$. If the molecular weight of the substance is M, and Avogadro number is $N_a$ then the radioactivity of the substance after time 't' is
jeemain
eamcet
physics
2012
q114
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A certain particle has a half life of 60 seconds. The fractions of the particles that will decay at the end of 10 seconds is
jeemain
eamcet
physics
2012
q113
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
For a transistor to work as an amplifier
jeemain
eamcet
physics
2012
q112
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
An electrical device which offers a low resistance to the current in one direction but a high resistance to the current in opposite direction is
jeemain
eamcet
physics
2012
q111
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
If the liquid in a U tube rises to a high level in the limb placed between poles of an electromagnet, then the liquid is
jeemain
eamcet
physics
2012
q110
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A magnetic dipole is placed under the effect of two magnetic fields inclined at $ 75^{\circ}$ to each other. One of the fields has a magnetic Induction of $ 1.5 \times 10^{-2}T$. The magnet comes to rest at an angle of $30^{\circ}$ with the direction of this field . The magnitude of the other field is
jeemain
eamcet
physics
2012
q109
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The objective lens of an optical Instrument is an achromat combination with a focal length of 90 cm. The two lenses possess dispersive powers 0.024 and 0.036 respectively and are in contact with each other. Then their focal lengths are
jeemain
eamcet
physics
2012
q108
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
Image of an object at infinity is formed by a convex lens of focal length 30 cm such that the size of the image is 2 cm. If a concave lens of focal length 20 cm is placed in between the convex lens and the image, at a distance 26 cm, from the convex lens size of the new image is
jeemain
eamcet
physics
2012
q107
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
If 'f' is focal length of lens in Ramsden's eye peice, crossed wires are placed at
jeemain
eamcet
physics
2012
q106
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
A progressive wave of frequency 500 Hz is travelling with a speed of 330 m/s in air. The distance between the two points which have a phase difference of $30^{\circ}$ is
jeemain
eamcet
physics
2012
q105
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The successive resonance frequencies in an open organ pipe are 1944 Hz and 2600 Hz. The length of the pipe if the speed of sound in air is 328 m/sec is
jeemain
eamcet
physics
2012
q104
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
The room temperature is $ + 20^{\circ}C$ when outside temperature is $- 20^{\circ}C$. Room temperature is $ + 10^{\circ}C$ when outside temperature is $ - 40^{\circ}C$. The temperature of the radiator heating the room is
jeemain
eamcet
physics
2012
q103
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
Assertion (A) : The air pressure in the car tyre increases during driving. Reasons (R) : Temperature of air in the tyre increases due to friction of tyre with road. Increase in temperature results in an increase in pressure according to Charle's law .
jeemain
eamcet
physics
2012
q102
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
Equal masses of three liquids, A, B and C have temperatures $ 10^{\circ}C, 25^{\circ}C \: and \: 40^{\circ}C$ respectively. If A and B are mixed, the mixtures has a temperature of $15^{\circ}C$. If B and C are mixed, the mixtures has a temperature of $30^{\circ}C$. If A and C are mixed, the temperature of the mixture is
jeemain
eamcet
physics
2012
q101
asked
Oct 20, 2013
by
thanvigandhi_1
1
answer
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