Recent questions tagged 2010

In IUPAC name of

asked Nov 20, 2013 by thanvigandhi_1

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Ozone layer is present in :

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The processes used in the refining of aluminium and zinc metals are respectively :

asked Nov 20, 2013 by thanvigandhi_1

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One mole of $ CoCI_3, YNH_3$ complex compound on complete ionisation in water produce three moles of ions. If one chloride satisfies both primary and secondary valencies of cobalt ion, the value of Y is :

asked Nov 20, 2013 by thanvigandhi_1

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The shape of $ XeF_6$ is :

asked Nov 20, 2013 by thanvigandhi_1

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The order of bond energies in halogen molecules is :

asked Nov 20, 2013 by thanvigandhi_1

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The oxidation numbers of sulphur in $ S_8,SO_2\: and \: H_2S$ respectively are :

asked Nov 20, 2013 by thanvigandhi_1

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In $P_4O_{10}$ , the number of oxygen atoms bonded to each phosphorous atom is :

asked Nov 20, 2013 by thanvigandhi_1

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A and B are the compounds of carbon. A on passing over red hot coke is converted to B. Then A and B are respectively :

asked Nov 20, 2013 by thanvigandhi_1

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Aluminium metal becomes passive in :

asked Nov 20, 2013 by thanvigandhi_1

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Match the following

asked Nov 20, 2013 by thanvigandhi_1

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Which of the following statement is incorrect ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the emulsifier in milk ?

asked Nov 20, 2013 by thanvigandhi_1

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Heat of formation of $ CO\: and \: CO_2 $ are - 26.4 and -94.0 kcal/mole respectively. What is the heat of combustion of $CO$ in kcals ?

asked Nov 20, 2013 by thanvigandhi_1

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Assertion (A) : According to Lowry-Bronsted theory, a substance can function as an acid as well as a base. Reasons (R) : Acid reacts with a base to produce a salt.

asked Nov 20, 2013 by thanvigandhi_1

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What is the effect of a ten-fold increase in pressure on $k_p$ in the reaction $ N_2(g)\: 3H_2(g) \: \leftrightharpoons \: 2\: NH_3 (g) $ at equilibrium ?

asked Nov 20, 2013 by thanvigandhi_1

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For the reaction $A+3b \rightarrow 2C+D$, which one of the following is not correct?

asked Nov 20, 2013 by thanvigandhi_1

1 answer

A crystalline solid substance has a density of $10 g/cm^3$ and the length of the edge of the unit cell (FCC) is 2.0 A. How many number of atoms are present in 200 grams of the solid ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the e.m.f of the cell for the reaction $ Fe^{2+} + Zn \rightarrow Zn^{2+} + Fe$ ? Given that $ E^0_{Zn|Zn^{2+}(1.0M) }=0.76\: V \: and \: E^0_{Fe|Fe^{2+}(1.0M) }=0.41\: V $

asked Nov 20, 2013 by thanvigandhi_1

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If the solution of copper sulphate in which a copper rod is immersed, is diluted 100 times, what is the change in electrode potential ( Reduction ) ?

asked Nov 20, 2013 by thanvigandhi_1

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What is the volume of $ 0.1\: M \: H_2SO_4$ required in litres to neutralize completely 1 litre of a solution containing 20 g of $NaOH$ ?

asked Nov 20, 2013 by thanvigandhi_1

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Which one of the following $ 1.0 \times 10^{-3}$ molal aqueous solutions has the highest boiling point ?

asked Nov 20, 2013 by thanvigandhi_1

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Equal weights of Methane and Oxygen are mixed in an empty container at $25^{\circ}C$. The fraction of the total pressure exerted by Oxygen is :

asked Nov 20, 2013 by thanvigandhi_1

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0.14 g of an element on combustion gives 0.28 g of its oxide. What is that element ?

asked Nov 20, 2013 by thanvigandhi_1

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Molecular orbital theory was proposed by:

asked Nov 20, 2013 by thanvigandhi_1

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The correct order of magnitude of bond angles among the compounds $ CH_4, NH_3 \: and \: H_2O$ is:

asked Nov 18, 2013 by thanvigandhi_1

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The incorrect order of second ionization energies in the following is :

asked Nov 18, 2013 by thanvigandhi_1

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In a hydrogen atom, the electron is at a distance of 4.768 A from the nucleus. The angular momentum of the electron is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The radial probability distribution curve obtained for an orbital wave function $ \Psi $ has 3 peaks and 2 radial nodes. The valence electron of which one of the following metals does this wave function $ ( \Psi )$ correspond to ?

asked Nov 18, 2013 by thanvigandhi_1

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In the figures shown below :

asked Nov 18, 2013 by thanvigandhi_1

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If 200 MeV of energy is released in the fission of 1 nucleus of $_{92}U^{235}$, the number of nuclei that undergo fission to produce energy of 10 kwh in one second :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The surface of a metal has work function 2.66 e V. This is illuminated with photons of wavelength 450 nm. Te de Broglie wavelength of the emitted photoelectrons is : ( Mass of electron = $9 \times 10^{-31}$ kg)

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The threshold frequency of the metal of the cathode in a photoelectric cell is $ 1 \times 10^{15}\: Hz$ . When a certain beam of light is incident on the cathode, it is found that a stopping potential '4.144 V' is required to reduce the current to zero. The frequency of the incident radiation is : $ ( h = 6.63 \times 10^{-34} J-s)$

asked Nov 18, 2013 by thanvigandhi_1

3 answers

A wire loop PQRSP is constructed by joining two semi - circular coils of radii $'r_1'\: and \: 'r_2'$ respectively as shown in the figure. If the current flowing in the loop is $'i'$ , then the magnetic induction at the point $'O'$ is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A metal rod of length 2 m is rotating with an angular velocity of 100 radiance / second in a plane perpendicular to a uniform magnetic field of 0.3 T. The potential difference between the ends of rod is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A wire of length 6.28 m is bent into a circular coils of 2 turns. If a current of 0.5 A exists in the coil, the magnetic moment of the coil is, in $ A-M^2$ :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

For a thermocouple the temperature of cold junction $(T_c)$ neutral temperature $(T_n) $ and temperature of inversion $(T_i)$ are $ 0^{\circ}C, 285^{\circ}C\: and \: 585^{\circ}C$ respectively. If the temperature of cold junction is raised to $ 10^{\circ}C$ then :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

The current voltage graph for a given metallic wire at two different temperatures $T_1\: and \: T_2$ is shown in the figure. The temperature $T_1\: and \: T_2$ are related as :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

A battery of e.m.f 2.1 V and internal resistance $0.05 \Omega$ is shunted for 5 seconds by a wire of constant resistance $ 0.02 \Omega$ , mass 1 g and specific heat $ 0.1 cal/g/^{\circ}C$ . The rise in the temperature of the wire is :

asked Nov 18, 2013 by thanvigandhi_1

1 answer

Four charges of magnitude - 'Q' are placed at the four corners of a square and a charge 'q' is at its centre. If the system is in equilibrium the value of 'q' is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The plates in a parallel plate capacitor are seperated by a distance 'd' with air as a medium between the plates. In order to increase the capacity by 66%, a dielectric slab of dielectric constant '5' is introduced between the plates. What is the thickness of the dielectric slab ?

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A short bar magnet is arranged with its North pole pointing geographical North. It is found that the horizontal component of Earth's magnetic induction ($B_H$) is balanced by the magnetic induction of the magnet at a point which is at a distance of 20 cm from its center . The magnetic moment of the magnet is : $( If \: B_H = 4 \times 10^{-5}\: Wb\: m^{-2})$:

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A short magnet oscillating in vibration magnetometer with a frequency 10 Hz . A downward current of 15 A is established in a long vertical wire placed 20 cm to the west of the magnet. The new frequency of the short magnet is : ( The horizontal component of earth's magnetic field is 12 $ \mu$ T)

asked Nov 17, 2013 by thanvigandhi_1

1 answer

If the ratio of maximum and minimum intensities of an interference pattern is 36 : 1, then the ratio of amplitudes of the two interfering waves will be :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A thin prism of angle $ 6^{\circ}$ made up of glass of refractive index 1.5 is combined with another prism made up of glass of refractive index 1.75 to produce dispersion without deviation. The angle of second prism is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

The magnification produced by an astronomical telescope for normal adjustment is 10 and the length of the telescope is 1.1 m. The magnification, when the image is formed at least distance of distinct vision is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A ray of light travels from an optically denser medium towards rarer medium. The critical angle for the two media is 'C'. The maximum possible angle of deviation of the ray is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A sound wave travels with a velocity of $ 300\: ms^{-1}$ through a gas. 9 beats are produced in 3 sec when two waves pass through it simultaneously. If one of the waves has 2 m wavelength, the wavelength of the other wave is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A source of sound producing wavelength of 50 cm is moving away from stationary observer with $ \large\frac{1}{5}th $ speed of sound. Then, what is the wavelength of sound heard by observer ?

asked Nov 17, 2013 by thanvigandhi_1

1 answer

A cylinder of radius 'R' made of material of coefficient of thermal conductivity $'k_1'$ is surrounded by a cylindrical shell of inner radius 'R' and outer radius 2 R made of a material of coefficient of thermal conductivity $'k_2'$ . The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in the steady state. The effective coefficient of thermal conductivity of the system is :

asked Nov 17, 2013 by thanvigandhi_1

1 answer

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