Recent questions tagged jeemain

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

asked Oct 23, 2013 by thanvigandhi_1

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Which of the following is not a conjugate acid- base pair?

asked Oct 23, 2013 by meena.p

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Assertion (A): Equal moles of different substance contain same number of constituent particles. Reason (R): Equal weights of different substances contain same number of constituent particles.

asked Oct 23, 2013 by meena.p

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The degree of dissociation of $N_2O_4$ in

asked Oct 23, 2013 by thanvigandhi_1

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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

asked Oct 23, 2013 by thanvigandhi_1

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An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

asked Oct 23, 2013 by meena.p

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A radioactive substance $_{88} X ^{228}(IIIA)$ emits $3 \alpha$ and $3\; \beta$ particles to form "Y". To which group of long form of the periodic table does "Y" belong ?

asked Oct 23, 2013 by meena.p

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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

asked Oct 23, 2013 by thanvigandhi_1

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Cell constant of a conductivity cell is

asked Oct 23, 2013 by thanvigandhi_1

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Match the following

asked Oct 23, 2013 by thanvigandhi_1

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Calculate enthalpy for formation of ethylene from the following data

asked Oct 23, 2013 by meena.p

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$ \alpha - D(+)-\: and \: \beta -D\: (+)-$ glucopyranoses are known as

asked Oct 23, 2013 by thanvigandhi_1

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The structure of bakelite is

asked Oct 23, 2013 by thanvigandhi_1

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In the Hofmann mustard oil reaction of primary amines, the black precipitate is due to

asked Oct 23, 2013 by thanvigandhi_1

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Assertion (A); NaCl is less soluble in heavy water than in ordinary water. Reason (R) : Dielectric constant of ordinary water is more than that of heavy water.

asked Oct 23, 2013 by meena.p

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The atomic composition of the entire universe is approximately given in the table below

asked Oct 23, 2013 by sreemathi.v

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The chemical formula of feldspar is

asked Oct 23, 2013 by meena.p

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A gas mixture contains 50% helium and 50% methane by volume .What is the percentage by mass of methane in the mixture

asked Oct 23, 2013 by sreemathi.v

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The formula of the product formed, when sodium thiosulphate solution is added to silver bromide is

asked Oct 23, 2013 by meena.p

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Which of the following pair of transition metal ions, have the same calculated values of magnetic moment?

asked Oct 23, 2013 by meena.p

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On analysis of an impure sample of sodium chloride,the percentage of chloride was found to be 45.5.What is the percentage of pure sodium chloride in the given sample ?

asked Oct 23, 2013 by sreemathi.v

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Identify 'B' in the following reaction : $CH_2 = CH_2+HCl \longrightarrow A+ 2[H] \longrightarrow B + HCl $

asked Oct 23, 2013 by meena.p

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Hydrogen and oxygen are combined in the ratio 1 : 16 by mass in hydrogen peroxide.Calculate the percentage of hydrogen and oxygen in hydrogen peroxide.

asked Oct 23, 2013 by sreemathi.v

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In an n-type semiconductor, the fermi energy level lies

asked Oct 23, 2013 by meena.p

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Calculate the percentage of nitrogen present in the composition of calcium nitrate.

asked Oct 23, 2013 by sreemathi.v

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In Sun, the important source of energy is

asked Oct 23, 2013 by meena.p

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In an experiment on photoelectric emission from a metallic surface, wavelength of incident light is $2 \times 10^{-7}$ m and stopping potential is 2.5 V. The threshold frequency of the metal (in Hz) approximately (charge of electron $e=1.6 \times 10^{-19}C.$ Planck's constant $h= 6.6 \times 10^{34}\;J-s)$

asked Oct 23, 2013 by meena.p

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The oxide of an element contains 32.33 percent of the element and the vapor density of its chloride is 79.Calculate the atomic mass of the element.

asked Oct 23, 2013 by sreemathi.v

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The work function of the nickel is $5 \;eV$. When a light of wavelength 2000 A falls on it, it emits photo electrons in the circuit. Then the potential difference necessary to stop the fastest electrons emitted is (given $h= 6.67 \times 10^{-34}\;J-s$)

asked Oct 23, 2013 by meena.p

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an electron beam travels with a velocity of $1.6 \times 10^{7}\;ms^{-1}$ perpendicularly to magnetic field of intensity 0.1 T. The radius of the path of electron beam $(m_e=9 \times 10^{-31}kg)$

asked Oct 23, 2013 by meena.p

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The natural frequency of an $I-C$ circuit is $1,25,000$ cycle/s. Then the capacitor C is replaced by another capacitor with a dielectric medium of dielectric constant by $25 \;kHz$. The value of K is

asked Oct 23, 2013 by meena.p

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Two wires A and B are of lengths 40 cm and 30 cm. A is bent into a circle of radius r and B into an arc of radius r. A current $t_1$ is passed through A and $t_2$ through B. To have the same magnetic induction at the center, the ratio of $t_1:t_2$ is

asked Oct 23, 2013 by meena.p

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Temperature of cold junction in a thermo couple is $10^{\circ}$ and neutral temperature is $270^{\circ}$, then the temperature of inversion is

asked Oct 23, 2013 by meena.p

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An aluminium (resistivity $\rho=2.2 \times 10^{-8} \Omega m)$ wire of a diameter $1.4 \;mm$ is used to make a $4 \Omega$ resistor. The length of the wire is

asked Oct 23, 2013 by meena.p

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Two unit negative charges are placed on a straight line. A positive charge q is placed exactly at the mid point between these unit charges. If the system of these three charges is in equilibrium, the value of (q in C) is

asked Oct 23, 2013 by meena.p

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In a metre bridge experiment, the ratio of the left gap resistance to right gap resistance is $2:3$, the balance point from left is

asked Oct 23, 2013 by meena.p

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Along the x-axis, three charges $\large\frac{q}{2},$$-q$ and $\large\frac{q}{2}$ are placed at $x=0,x=a$ and $x=2a$ respectively. The resultant electric potential at a point P located at a distance r from the charge -q( a << r) is ($ \varepsilon _0 $ is the permittivity of free space)

asked Oct 23, 2013 by meena.p

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One gram of a chloride was found to contain 0.835g of chlorine.Its vapor density is 85.Calculate its molecular formula

asked Oct 23, 2013 by sreemathi.v

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A bar magnet of magnetic moment M and moment of inertia I is freely suspended such that the magnetic axial line in the direction of magnetic meridian. If the magnet is displaced by a very small angle ($ \theta$), the angular acceleration is (Magnetic induction of earth's horizontal field$=B_H$)

asked Oct 23, 2013 by meena.p

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On dissolving 2.0g of metal in sulphuric acid 4.51g of the metal sulphate was formed.The specific heat of the metal is 0.057cal/g.What is the exact atomic mass of the metal?

asked Oct 23, 2013 by sreemathi.v

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A chloride of an element contains 49.5% chlorine.The specific heat of the element is $0.056$.Calcuate the equivalent mass,valency.

asked Oct 23, 2013 by sreemathi.v

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The equivalent weight of a metal is double than that of oxygen .How many times is the weight of its oxide greater than the weight of metal?

asked Oct 23, 2013 by sreemathi.v

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The percentage of an element $m$ is 53 in its oxide of molecular formula $M_2O_3$.Its atomic mass is about

asked Oct 23, 2013 by sreemathi.v

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A metal m of equivalent mass E forms an oxide of molecular formula $M_xO_y$ .The atomic mass of the metal is given by the correct equation.

asked Oct 23, 2013 by sreemathi.v

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How many years it would take to spend one Avogadro's number of rupees at a rate of 10lakh of rupees in one second

asked Oct 23, 2013 by sreemathi.v

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The electric charge on the electron is $1.602\times 10^{-19}$ coulomb.How much charge is present on 0.1 mole of $Cu^{2+}$ ions?

asked Oct 23, 2013 by sreemathi.v

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How many electrons are present in 1.6g of methane?

asked Oct 23, 2013 by sreemathi.v

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How many molecules of atoms of oxygen are present in 5.6 litres of oxygen $(O_2)$ at NTP?

asked Oct 23, 2013 by sreemathi.v

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A bar-magnet of moment of inertia $49 \times 10^{-2}$ vibrates in a magnetic field of induction $0.5 \times 10^{-4}T.$ The time period of vibration is $8.8 \;s$. The magnetic moment of the bar magnet is

asked Oct 22, 2013 by meena.p

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In Huygens eyepiece

asked Oct 22, 2013 by meena.p

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