Recent questions tagged 2007

The equilibrium constant for the reaction $SO_2 (g)+\large\frac{1}{2}$$ O_2 (g) \rightleftharpoons SO_3(g)$ is $5 \times 10 ^{-2}\;atm$ The equilibrium consant of the reaction $250_3(g) \rightleftharpoons 2SO_2(g) +O_2 (g) $ would be

asked Oct 24, 2013 by meena.p

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Which of the following is not correct?

asked Oct 24, 2013 by meena.p

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Among the following, which is water insoluble ?

asked Oct 24, 2013 by meena.p

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Calorific value of producer gas is low because of

asked Oct 24, 2013 by meena.p

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Which of the following is not a peroxy acid?

asked Oct 24, 2013 by meena.p

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Bhopal gas tragedy of 1984 was caused by

asked Oct 24, 2013 by meena.p

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Aqueous solution of an organic compound. $'A'$ on electrolysis liberates acetylene and $CO_2$ at anode. $'A'$ is

asked Oct 24, 2013 by meena.p

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An organic compound 'X' on treatment with pyridinium chloro chromate in dichloromethane gives compound 'y'. Compound 'y', reacts with $l_2$ and alkali to form triiodomethane. The compound 'X' is

asked Oct 24, 2013 by meena.p

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Nitro benzene on reduction with zinc and $NH_4 CL$ gives

asked Oct 24, 2013 by meena.p

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Which of the following biomolecules acts as specific catalysts in biological reaction ?

asked Oct 24, 2013 by meena.p

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Calculate the emf of the cell $ Cu(s)|Cu^{2+} (aq)| |Ag^{+}(aq)| Ag(s) $ Given $E^{\circ}_{Cu^{2+}/Cu} =+0.34 \;V, E^{\circ}_{Ag^{+}/Ag}=0.80\;V$

asked Oct 24, 2013 by meena.p

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A certain mass of a gas occupies a volume of $2L$ at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant ?

asked Oct 24, 2013 by meena.p

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Which of the following is not tetrahedral ?

asked Oct 24, 2013 by meena.p

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The maximum number of sub-levels, orbitals and electrons in N shell of an atom are respectively

asked Oct 24, 2013 by meena.p

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Assertion (A): A catalyst increase the rate of a reaction. Reason (R): In presence of a catalyst, the activation energy of the reaction increases.

asked Oct 23, 2013 by meena.p

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Which of the following is an example of interstitial hydride?

asked Oct 23, 2013 by meena.p

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Which one of the following salts give an acidic solution in water?

asked Oct 23, 2013 by meena.p

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The following are some statement related to VA group hydrides,

asked Oct 23, 2013 by meena.p

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Which one of the following noble gases is used in miner's cap lamps ?

asked Oct 23, 2013 by meena.p

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The IUPAC name of the compound $(CH_3)_2 CH - CH = CH - CHOH -CH_3$ is

asked Oct 23, 2013 by meena.p

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Match the following:

asked Oct 23, 2013 by meena.p

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Hybridisation of oxygen in diethyl ether is

asked Oct 23, 2013 by meena.p

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\[CH_3 COOH \quad \underrightarrow {LiAlH_4} \quad A\] \[A +CH_3COOH \quad \underrightarrow {H_3O^{+}} \quad B+H_2O\] In the abive reactions 'A' and 'B' respectively are

asked Oct 23, 2013 by meena.p

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Which of the following is a biodegradable polymer?

asked Oct 23, 2013 by meena.p

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Which of the following statements is correct?

asked Oct 23, 2013 by meena.p

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138 g of ethyl alcohol is mixed with 72 g of water. The ratio of mole fraction of alcohol to water is

asked Oct 23, 2013 by meena.p

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The decreasing order of bond dissociation energies of C - C, C -H and H -H bound is

asked Oct 23, 2013 by meena.p

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The wavelength of a spectral line emitted by hydrogen atom in the Lyman series is $\large\frac{16}{15 R}$$cm$. What is the value of $n_2 ? $ (R=Rydberg constant)

asked Oct 23, 2013 by meena.p

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$CaOCl_2+ H_2O \longrightarrow Ca(OH)_2+X;\;X+CH_3CHO \longrightarrow Y \; ; Y+ Ca(OH)_2 \longrightarrow CHCL_3.$ What is Y?

asked Oct 23, 2013 by meena.p

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The functional groups present in 'salol' are

asked Oct 23, 2013 by meena.p

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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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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

1 answer

Calculate enthalpy for formation of ethylene from the following data

asked Oct 23, 2013 by meena.p

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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 chemical formula of feldspar is

asked Oct 23, 2013 by meena.p

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

asked Oct 23, 2013 by meena.p

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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 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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