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Recent questions in Chemistry

Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Which orbital is nearest to the nucleus?

asked Jan 10, 2014 by sreemathi.v

1 answer

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

asked Jan 10, 2014 by sreemathi.v

1 answer

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

1 answer

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

1 answer

Photoelectric effect shows :

asked Jan 10, 2014 by sreemathi.v

1 answer

The study of photoelectric effect is useful in understanding :

asked Jan 10, 2014 by sreemathi.v

1 answer

Which of the following does not characterized X-rays?

asked Jan 10, 2014 by sreemathi.v

1 answer

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

1 answer

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

1 answer

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

asked Jan 10, 2014 by sreemathi.v

1 answer

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

1 answer

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

asked Jan 10, 2014 by sreemathi.v

1 answer

For which of the following process energy is absorbed?

asked Jan 9, 2014 by sreemathi.v

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

Find the wave length of radiation required to excite the electron in ground level of $Li^{++}(z=3)$ to third energy level.Also find the ionization energy of $Li^{2+}$.(R=$1.097\times 10^7m^{-1})$

asked Jan 9, 2014 by sreemathi.v

1 answer

Calculate the wave length of light radiation that would be emitted,when an electron in the fourth Bohr's orbit of $He^+$ ion falls to the second Bohr's orbit.To what transition does this light radiation correspond in the H-atom?

asked Jan 9, 2014 by sreemathi.v

1 answer

A spectral line in the spectrum of $H$-atom has a wave number of $15222.22cm^{-1}$. What transition is responsible for this radiation? (Rydberg constant $R=1.096\times 10^5cm^{-1}$)

asked Jan 9, 2014 by sreemathi.v

1 answer

Estimate the wavelength of second line (also called as $\beta$-line) in Balmer series of hydrogen atom

asked Jan 9, 2014 by sreemathi.v

1 answer

A hydrogen atom in the ground state is hit by a particle exciting the electron to 4s orbital.The electron then drops to 2s orbital.What is the frequency of radiation emitted and absorbed in the process?

asked Jan 9, 2014 by sreemathi.v

1 answer

Determine the frequency of revolution of the electron in $2^{nd}$ Bohr's orbit in hydrogen atom

asked Jan 9, 2014 by sreemathi.v

1 answer

Calculate the velocity of electron ejected from platinum surface when radiation of 200nm fall on it. Work function of platinum is 5eV. $(1eV=1.6\times 10^{-19}J$)

asked Jan 9, 2014 by sreemathi.v

1 answer

A 100W power source emits green light at a wavelength $\lambda=5000\overset{\circ}{A}$. How many photons per minute are emitted by the source?

asked Jan 9, 2014 by sreemathi.v

1 answer

Given the $\lambda$ values for violet light ($\lambda=4.10\times 10^{-5}cm)$ and red light($\lambda=6.56\times 10^{-5}cm$), which of the following is true about the ratio of energies carried by them and their frequencies?

asked Jan 9, 2014 by sreemathi.v

1 answer

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

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

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

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

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

1 answer

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

1 answer

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

1 answer

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

asked Jan 9, 2014 by sreemathi.v

1 answer

Which does not change on dilution?

asked Jan 9, 2014 by sreemathi.v

1 answer

$RH_2$(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

1 answer

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

1 answer

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

1 answer

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

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

1 answer

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

asked Jan 8, 2014 by sreemathi.v

1 answer

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

1 answer

10 mole of $SO_2$ and 15 mole of $O_2$ were passed over catalyst to produce 8 mole of $SO_3$.The ratio of $SO_2$ and $SO_3$ moles in mixture is

asked Jan 8, 2014 by sreemathi.v

1 answer

How many moles of $KI$ are needed to produce 0.4moles of $K_2HgI_4$?

asked Jan 8, 2014 by sreemathi.v

1 answer

The mass of carbon anode consumed(giving only carbon dioxide) in the production of 270Kg of aluminum metal from bauxite by the Hall's process is

asked Jan 8, 2014 by sreemathi.v

1 answer

Which of following is a secondary standard

asked Jan 8, 2014 by sreemathi.v

1 answer

Number of $K^+$ ions present in one litre of M/5 $KMnO_4$ solution are :

asked Jan 8, 2014 by sreemathi.v

1 answer

$4I^-+Hg^{2+}\rightarrow HgI_4^{2-}$;1 mole each of $Hg^{2+}$ and $I^-$ will form _________ mole $HgI_4^{2-}$

asked Jan 8, 2014 by sreemathi.v

1 answer

A sample of $MnSO_4.4H_2O$ is heated in air to give $Mn_3O_4$.The residue $Mn_3O_4$ is dissolved in 100ml of $N/10$ $FeSO_4$ containing $H_2SO_4$.The solution reacts completely with 50ml of $KMnO_4$.25ml of this $KMnO_4$ requires 30ml of N/10 $FeSO_4$ for complete oxidation.Determine the amount of $MnSO_4.4H_2O$ is the sample

asked Jan 8, 2014 by sreemathi.v

1 answer

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