Recent questions tagged easy

Magnetic moments of $V(Z=23), \;Cr(Z=24),\;Mn(Z=25)$ are $x,\;y,\;z$ , respectively. Hence,

asked Jan 10, 2014 by sreemathi.v

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Which of the following has the maximum number of unpaired electrons?

asked Jan 10, 2014 by sreemathi.v

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The point which divides the line joining the points $(2,4,5)\:\:and\:\:(3,5,-4)$ in the ratio $2:3$ externaly lies on the plane?

asked Jan 10, 2014 by rvidyagovindarajan_1

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Which is correct paramagnetic order?

asked Jan 10, 2014 by sreemathi.v

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The correct ground state electronic configuration of chromium atom is

asked Jan 10, 2014 by sreemathi.v

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Which electronic level would allow a H-atom to absorb a photon but not to emit a photon ?

asked Jan 10, 2014 by sreemathi.v

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Which subshell has maximum energy (polyelectronic system)?

asked Jan 10, 2014 by sreemathi.v

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The number of d-electrons present in $Fe^{2+}$ is

asked Jan 10, 2014 by sreemathi.v

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Total number of nodal planes are same in

asked Jan 10, 2014 by sreemathi.v

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Which orbital is nearest to the nucleus?

asked Jan 10, 2014 by sreemathi.v

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Assuming the velocity to be same,which sub-atomic particle possesses smallest de-Brogile wavelength

asked Jan 10, 2014 by sreemathi.v

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If the total energy of an electron in a hydrogen like atom in an excited state is -3.4eV then the debroglie wavelength of the electron is

asked Jan 10, 2014 by sreemathi.v

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The work function for a metal is 4eV.To emit a photon-electron of zero velocity from the surface of the metal,the wavelength of incident light should be

asked Jan 10, 2014 by sreemathi.v

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Photoelectric effect shows :

asked Jan 10, 2014 by sreemathi.v

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The study of photoelectric effect is useful in understanding :

asked Jan 10, 2014 by sreemathi.v

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Which of the following does not characterized X-rays?

asked Jan 10, 2014 by sreemathi.v

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A photon of 300nm is observed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm, the wavelength of second re-emitted photon is

asked Jan 10, 2014 by sreemathi.v

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Suppose $10^{-17}J$ of light energy is needed by the interior of human eye to see an object .The photons of green light ($\lambda =550nm)$ needed to see the object are :

asked Jan 10, 2014 by sreemathi.v

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The maximum sum of the number of neutrons and protons in an isotope of hydrogen is

asked Jan 10, 2014 by sreemathi.v

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The ratio between the neutrons present in carbon and silicon with respect to mass number of 12 and 28 respectively is

asked Jan 10, 2014 by sreemathi.v

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The total number of fundamental particles in one atom of $_6 C ^{14}$ is

asked Jan 10, 2014 by sreemathi.v

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The angle between the lines $x=1,\:y=2$ and $y=-1,\:z=0$ is ?

asked Jan 9, 2014 by rvidyagovindarajan_1

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For which of the following process energy is absorbed?

asked Jan 9, 2014 by sreemathi.v

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A and B throw a dice each. The probability that A's throw is not greater than B's throw is

asked Jan 9, 2014 by thanvigandhi_1

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Heavy water molecule made from $_2 H ^3$ and $O ^{18}$ has a molecular weight of

asked Jan 9, 2014 by sreemathi.v

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The ratio of specific charge (e/m) of a proton to that of an $\alpha$-particle is :

asked Jan 9, 2014 by sreemathi.v

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The pair having identical value of $\large\frac{e}{m}$:

asked Jan 9, 2014 by sreemathi.v

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Two elements A (atomic weight = 75) and B (atomic weight = 16) combine to yield a compound. The % by weight of A in the compound was found to be 75.08 . The formula of the compound is :

asked Jan 9, 2014 by sreemathi.v

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A compound was found to contain 5.37% nitrogen.What is the minimum molecular weight of compound?

asked Jan 9, 2014 by sreemathi.v

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The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight.The molecular weight of haemoglobin as 67,200.The numbers of iron atoms in each molecule of haemoglobin is (at wt of iron=56)

asked Jan 9, 2014 by sreemathi.v

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Insulin contains 3.4% sulphur.The minimum mol weight of insulin is :

asked Jan 9, 2014 by sreemathi.v

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An ore contains 2.0% by weight of the mineral argentive $(Ag_2S)$.How much of ore should be taken to produce 1.0g pure Ag?

asked Jan 9, 2014 by sreemathi.v

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How many of $KCl$ would have to be dissolved in 60g $H_2O$ to give 20% by weight of solution?

asked Jan 9, 2014 by sreemathi.v

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The mole fraction of NaCl in a solution containing 1 mole of NaCl in 1000g of water is

asked Jan 9, 2014 by sreemathi.v

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Number of $H^+$ ions in 100ml of 0.001M $H_2SO_4$ is

asked Jan 9, 2014 by sreemathi.v

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Which does not change on dilution?

asked Jan 9, 2014 by sreemathi.v

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The probability that $ \sin^{-1} ( \sin \: x)+ \cos^{-1} ( \cos\: y)$ is an integer $ x,y \in \{ 1,2,3,4 \} $ is

asked Jan 8, 2014 by thanvigandhi_1

1 answer

The direction cosine of a line which is $\perp$ to two perpendicular lines whose direction cosines are $(l_1,m_1,n_1)\:\:and\:\:(l_2,m_2,n_2)$ is ?

asked Jan 8, 2014 by rvidyagovindarajan_1

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$RH_2$(ion exchange resin)can replace $Ca^{2+}$ in hand water as,$RH_2+Ca^{2+}\rightarrow RCa+ 2H^+$.1 litre of hard water passing through $RH_2$ has PH is 2.Hence hardness in PPM of $Ca^{2+}$ is:

asked Jan 8, 2014 by sreemathi.v

1 answer

How much water is to be added to dilute 10ml of 10M HCl to make it decimolar?

asked Jan 8, 2014 by sreemathi.v

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25ml of 3.0M $HNO_3$ are mixed with 75ml of 4.0M $HNO_3$.If the volumes are additive,the molarity of the final mixture would be :

asked Jan 8, 2014 by sreemathi.v

1 answer

Amount of oxygen required for complete combustion of 27g Al is

asked Jan 8, 2014 by sreemathi.v

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The % loss in weight after heating a pure sample of potassium chlorate (M wt:122.5) will be

asked Jan 8, 2014 by sreemathi.v

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A box contains 24 identical bals of which 12 are white and remaining black. The balls are drawn at random from the box one at a time with replacement. The probability that a white ball is drawn for the 4th time on the 7th draw is

asked Jan 8, 2014 by thanvigandhi_1

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For the reaction :$A+2B\rightarrow C$,5 mole of A and 8 mole of B will produce

asked Jan 8, 2014 by sreemathi.v

2 answers

An unbiased die with faces marked 1,2,3,4,5 and 6 is rolled four times out of four values obtained, the probability that the minimum face value is not less than 2 and the maximum face value is not greater than 5 is :

asked Jan 8, 2014 by thanvigandhi_1

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If $0.5$ mole of $BaCl_2$ is mixed with 0.2 mole of $Na_3PO_4$,the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is :

asked Jan 8, 2014 by sreemathi.v

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What is effective capacitance between A and B

asked Jan 8, 2014 by meena.p

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The weight of slaked lime required to decompose 8.0g $NH_4Cl$ is

asked Jan 8, 2014 by sreemathi.v

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Assuming fully decomposed,the volume of $CO_2$ released at STP,on heating 9.85g of $BaCO_3$ (at wt of Ba=137)will be:

asked Jan 8, 2014 by sreemathi.v

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