Recent questions tagged 2010

Reduction of nitrobenzene with $Z_n$ and alcoholic $KOH$ solution results in the formation of the following compound:

asked Oct 2, 2013 by meena.p

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Identify $A,B$ and $C$ in the following reactions :

asked Oct 2, 2013 by meena.p

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Which one of the following gives yellow precipitate with iodine and $NaOH$ solution ?

asked Oct 2, 2013 by meena.p

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Identify the product (A) of the following reaction :

asked Oct 2, 2013 by meena.p

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The two enantiomers of secondary butyl chloride differ from each other in which one of the following properties?

asked Oct 2, 2013 by meena.p

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Which one of the following pairs of 2,3- butane diol is enantiomeric?

asked Oct 2, 2013 by meena.p

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In which of the following, ortho/para substitution by an electrophile is very facile?

asked Oct 2, 2013 by meena.p

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Diels- Alder reaction will not take place with which of the following reactants?

asked Oct 2, 2013 by meena.p

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The conservation of O-acylated phenol in presence of $AlCl_3$ to $C-$acylated pheno is an example for this type of organic reaction:

asked Oct 2, 2013 by meena.p

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The acceptable level of carbon monoxide gas (CO) in the atmosphere in ppm level is :

asked Oct 2, 2013 by meena.p

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The chemical reaction that involves roasting process is :

asked Oct 2, 2013 by meena.p

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Which of the following is a current statement?

asked Oct 2, 2013 by meena.p

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Helium mixed with oxygen is used in the treatment of :

asked Oct 2, 2013 by meena.p

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Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide ?

asked Oct 2, 2013 by meena.p

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Which one pf the following is most acidic?

asked Oct 1, 2013 by meena.p

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The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is :

asked Oct 1, 2013 by meena.p

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Which one of the following is the mineral for tin ?

asked Oct 1, 2013 by meena.p

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Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions ?

asked Oct 1, 2013 by meena.p

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Solvay process is used in the manufacture of :

asked Oct 1, 2013 by meena.p

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The orange coloured compound formed when $H_2O_2$ is added to $TiO_2$ solution acidified with conc. $H_2SO_4$ is :

asked Oct 1, 2013 by meena.p

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A micelle formed during the cleansing action by the soap is :

asked Oct 1, 2013 by meena.p

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A system is provided with 50 Joules of heat and the work done on the system is 10 Joules. What is the change in internal energy of the system in Joules?

asked Oct 1, 2013 by meena.p

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The $pH$ of $0.01\;M$ solution of acetic acid is $5.0$. What are the values of $[H^{+}]$ and $K_{\alpha}$ respectively ?

asked Oct 1, 2013 by meena.p

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If the equilibrium constant for the reaction $H_{2(g)}+I_{2(g)} \rightleftharpoons 2 HI_{(g)}$ is $K $ What is the equilibrium constant of $HI_{(g)} \rightleftharpoons \large\frac{1}{2} $$H_{2(g)}+\large\frac{1}{2} $$I_{2(g)}$?

asked Oct 1, 2013 by meena.p

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What is the slope of the straight line for the graph drawn between ln $k$ and $\large\frac{1}{T}$, where $k$ is the rate constant of a reaction at temperature T?

asked Oct 1, 2013 by meena.p

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Assertion (A) : White tin is an example of tetragonal system. Reasoning (R): For a tetragonal system $a=b=c$ and $\alpha =\beta = \gamma \neq 90^{\circ}$. The correct answer is :

asked Oct 1, 2013 by meena.p

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A solution of concentration 'C' g equiv/ litre has a specific resistance R. The equivalent conductance of the solution is :

asked Oct 1, 2013 by meena.p

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At a certain temperature and at infinite dilution, the equivalent conductance of sodium benzoate, hydrochloric acid and sodium chloride are 240,349 and 229 $ohm^{-1} cm^2 equiv^{-1}$ respectively. The equivalent conductance of benzoic acid in $ohm^ {-1}\;cm^2\;equiv^{-1}$ at the same conditions is :

asked Oct 1, 2013 by meena.p

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X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X and Y :

asked Oct 1, 2013 by meena.p

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If $BaCl_2$ ionizes to an extent of $80 \%$ in aqueous solution, the value of Van't Hoff factor is :

asked Oct 1, 2013 by meena.p

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$CH_4$ diffuses two times faster than a gas X. The number of molecules present in 32 g of gas X is : (N is Avogadro number)

asked Oct 1, 2013 by meena.p

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The number of molecules of $CO_2$ liberated by the complete combustion of $0.1$ grams atom of graphite in air is :

asked Oct 1, 2013 by meena.p

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The ratio of anion radius to cation radius of a crystal is $10 : 9.3 $. Then, the coordination number of the cation in the crystal is :

asked Oct 1, 2013 by meena.p

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Match the following:

asked Oct 1, 2013 by meena.p

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The electron affinity values of elements A,B,C and D are respectively $-135,-60,-200$ and $-348$ kJ mol^{-1}.The outer electronic configuration of element B is :

asked Oct 1, 2013 by meena.p

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Which one pf the following conditions is incorrect for a well behaved wave function $(\psi)$?

asked Oct 1, 2013 by meena.p

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Which one of the following of an electron in hydrogen atom emits radiation of the lowest wavelength ?

asked Oct 1, 2013 by meena.p

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A transistor having a $\beta$ to $80$ has a change in base current of $250\; \mu A$ then the change in collector current is :

asked Oct 1, 2013 by meena.p

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Three particles $\alpha- particle,$ proton and deuteron are acceleration by the same potential difference. The velocities of them are in the ratio:

asked Oct 1, 2013 by meena.p

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Photoelectric emission is observed from a metallic surface for frequencies $v_1$ and $v_2$ of the incident light $(v_1 > v_2)$. If the maximum values of kinetic energy of the photo electrons emitted in the two cases are in the ratio $1:n$, then the threshold frequency of the metallic surface is :

asked Oct 1, 2013 by meena.p

1 answer

In Thomson's experiment to determine $\large\frac{e}{m}$ of an electron , it is found that an electron beam having a kinetic energy of $45.5\;eV$ remains undeflected, when subjected to crossed electric and magnetic fields. If $E=1 \times 10^{3} Vm^{-1}$, the value of $'B'$ is (mass of the electron is $9.1 \times 10^{-31}\;kg$) :

asked Sep 30, 2013 by meena.p

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The time constant of inductance coil is 3 m sec. When a $90\;\Omega$ resistance is joined in series, then the time constant becomes 0.5 m sec. The inductance and the resistance of the coil are :

asked Sep 30, 2013 by meena.p

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A capacitor $0.1\;\mu F$ connected in series to a resistor of $10 \;M \; \Omega$ is charged to a certain potential and then made a discharge through the resistor. The time in which the potential will take to fall to half its original value is (Given $\log _{10}2=0.3010$):

asked Sep 30, 2013 by meena.p

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The intensity of the magnetic induction field at the center of a single turn circular coil of radius 5 cm carrying current of $0.9A$:

asked Sep 30, 2013 by meena.p

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The thermo e.m.f of a thermo-couple is given by , $\xi =a T +bT^2,$ where $a/b=-200^{\circ}C$. If the cold function is kept at $30^{\circ}$, then the inversion temperature is ($ \xi$ in volts, T is in centigrade):

asked Sep 30, 2013 by meena.p

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Charge passing through a conductor of cross -section area $A=0.3 m^2$ is given by $q=3t^2+5t+2$ in coulombs, where 't't is in seconds. What is the value of drift velocity at $t=2$ sec. Given $n= 2 \times 10^{25}/mn^3$:

asked Sep 30, 2013 by meena.p

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$6 \Omega$ nad $12 \Omega$ resistors are connected in parallel. This combination is connected in series with a $10\;V$ battery and $6 \Omega$ resistor. What is the potential difference between the terminals of the $12 \Omega$ resistor?

asked Sep 30, 2013 by meena.p

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Two capacitors of capacities $1 \; \mu F$ and $C \;\mu F$ are connected in series and the combination is charged to a potential difference of $120 \;V$ If the charge on the combination is $80\; \mu C$, the energy stored in the capacitor of capacity C in micro- Joules is :

asked Sep 30, 2013 by meena.p

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The potential difference between two parallel plates is $10^4\;volts$. If the plates are separated by 0.5 cm, the force on an electron between the plates is :

asked Sep 30, 2013 by meena.p

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A short magnetic needle is pivoted in a uniform magnetic field of induction $1T.$ Now, simultaneously another magnetic field of induction $\sqrt 3 T$ is applied at right angles to the first field; the needle deflects through an angle $\theta'$ whose value is :

asked Sep 30, 2013 by meena.p

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