Recent questions tagged class11

Non metals present in borax are

asked Jan 28, 2014 by sreemathi.v

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For 12 pair of observation on $x$ and $y$ the $r$ calculated is $0.674$. The standard error is

asked Jan 28, 2014 by thanvigandhi_1

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The alkali metal used as coolant in nuclear reactors is

asked Jan 28, 2014 by sreemathi.v

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If in a moderately skewed distribution the value of mode and mean are $ 6 \lambda \: and \: 9 \lambda$ respectively, then value of median is

asked Jan 28, 2014 by thanvigandhi_1

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Glauber salt is a

asked Jan 28, 2014 by sreemathi.v

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Combined mean of two series $x_1\: and \: x_2$ when \[\] $x_1 = 210,\: x_2 = 150, \: n_1=50, \: n_2=100 $ is

asked Jan 28, 2014 by thanvigandhi_1

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On thirteen consecutive days the number of persons booked for violating speed limit of 40 km / hr were as follows. \[ \] 58, 61, 68, 57, 62, 50, 55, 62, 53, 54, 51, 59, 52 \[\] The median number of speed violations per day is

asked Jan 28, 2014 by thanvigandhi_1

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The 70th percentile is equal to

asked Jan 28, 2014 by thanvigandhi_1

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Pearl ash is

asked Jan 28, 2014 by sreemathi.v

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The average translational kinetic enegry of Oxygen molecules (molecular weight of $O_2$ is 32) at a particlular temperature is 0.032eV. What is the average translational kinetic energy of $N_2$ molecules (molecular weight is 28) at the same temperature

asked Jan 28, 2014 by balaji.thirumalai

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Which among the compounds of alkali metals undergo hydrolysis

asked Jan 28, 2014 by sreemathi.v

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A vessel is filled with an ideal gas at 76 cm of Hg (mercury). The mass of gas is increased by 25% by introducing more gas at the same temperature. What is the resultant pressure of Hg in cm?

asked Jan 28, 2014 by balaji.thirumalai

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The alkali metal bi carbonate that has no existance in solid state is

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Tincal contains mainly

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What is the formula of calgon?

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Which of the following is best $CO_2$ absorber as well as source of $O_2$ in space capsule?

asked Jan 28, 2014 by sreemathi.v

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Which of the following salts does not form any ppt with excess of NaOH ?

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The energy density of an ideal monoatomic gas is equal to:

asked Jan 28, 2014 by balaji.thirumalai

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Considering greater polarization in lid compared to that in NaCl,which of the following statements you would expect to be wrong?

asked Jan 28, 2014 by sreemathi.v

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The $x$-components of velocity of some particles (in $km/s$) are $6,4,2,0,-2,-4,-6$. The root-mean-square (rms) velocity calculated from these data (in $km/s$) is nearest to?

asked Jan 28, 2014 by balaji.thirumalai

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A given sample of ideal gas is made to undergo a process in which the temperature decreases by 10% and the pressure decreases by 8%. By what % does the volume change?

asked Jan 28, 2014 by balaji.thirumalai

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In castner-kellner cell used for the manufacture of NaOH,the cathode in the central compartment is made up of

asked Jan 28, 2014 by sreemathi.v

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The salt used for performing bead test in inorganic qualitative analysis is

asked Jan 28, 2014 by sreemathi.v

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Four alkali metals A,B,C and D are having standard electrode potentials as -3.05,-1.66,-0.40 and 0.80v respectively,which one will be the most reducing agent?

asked Jan 28, 2014 by sreemathi.v

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$CO+NaOH\rightarrow $?

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The metal which gives brick red colour in flame test is

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Oxides of alkaline earth metals are stable due to

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The salt which gives crimson red colour in flame test is

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To what series does the spectral lines of atomic hydrogen belong if its wave number is equal to the difference between the wave numbers of the following two lines of the Balmer series 486.1 and 410.2 nm?

asked Jan 28, 2014 by sharmaaparna1

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Which of the following metals cannot give flame tests?

asked Jan 28, 2014 by sreemathi.v

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The electrical conductivity in aqueous solutions is high for

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Which does not form peroxides?

asked Jan 28, 2014 by sreemathi.v

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A series of lines in the spectrum of atomic H lies at wavelengths 656.46 , 486.27 , 434.17 , 410.29 mm. what is the wavelength of next line in this series?

asked Jan 28, 2014 by sharmaaparna1

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Magnesium burns in air giving two products .Their formulae are

asked Jan 28, 2014 by sreemathi.v

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Oxygen evolves on heating

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$BeH_2$ and $MgH_2$ are prepared using the reagent

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The elements that reacts with cold water

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The polorising power of $Mg^{2+}$ is nearly same as that of

asked Jan 28, 2014 by sreemathi.v

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A hydrogen like atom (atomic No. Z) is in a higher excited state of quantam number n. This excited atom can make a transition to the first excited state by successively emitting two photons of energies 10.20 eV and 17.00 eV respectively. alternatively the atom from the same excited state can make a transition to the second excited state by successively emitting two photons of energy 4.25eV and 5.95 eV respectively. Determine the values of n and Z.

asked Jan 28, 2014 by sharmaaparna1

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Which of the following is less covalent?

asked Jan 28, 2014 by sreemathi.v

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Hardening of plaster of paris is because of

asked Jan 28, 2014 by sreemathi.v

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A compound of Vanadium has a magnetic moment of 1.73 Bm. Work out the electric configuration of the Vanadium ion in the compound.

asked Jan 28, 2014 by sharmaaparna1

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In the hardening stage of plaster of paris,the compound formed is

asked Jan 28, 2014 by sreemathi.v

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Passivity is exhibited by

asked Jan 28, 2014 by sreemathi.v

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Which of the following is an alkaline earth?

asked Jan 28, 2014 by sreemathi.v

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The metal carbonate which decomposes easily on heating is

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Which of the following has no existance as a solid?

asked Jan 28, 2014 by sreemathi.v

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The least ionic chloride is given by

asked Jan 28, 2014 by sreemathi.v

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The alkaline earth metal whose carbonate has no natural occurence is

asked Jan 28, 2014 by sreemathi.v

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Consider the following reaction $6NaOH+3Cl_2\rightarrow 5NaCl+A+3H_2O$ what is the oxidation number of chlorine in "A"?

asked Jan 28, 2014 by sreemathi.v

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