Recent questions in Chemistry

In the absence of green house effect what would be the mean temperature of earth?

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The beauty of Tajmahal is getting destroyed due to

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The level of CO gas in air that causes immediate death is

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Which of the following is primary pollutant?

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Acid rain contains

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PH of acid rain may be

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Global warming can be prevented by

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The most abundant hydrogen pollutant is

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Solid component of the earth consisting of soil,rocks and mountains is called

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The region which is greatly affected by air pollution is

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The greatest affinity for haemoglobin is shown by

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Ozone layer is present in

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The study of toxicity of organo metallic compound is termed as

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COD is measure of

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Chemical oxygen is determined by using

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The amount of oxygen required for healthy growth of plants and animals in water is

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Among the following which is contaminant

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A good quality of water will have

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Which of the following can act as sink for $CO_2$ and $SO_2$

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The sink for dead plants and animals is

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Identification of a pollutant as organic ,inorganic (or) organometallic origin is called

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Which of the following gas responsible for Bhopal gas tragedy

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Composition of PAN is

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Gradual warming of the atmosphere due to trapping of radiation of long wavelength is called

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Identify the correct statement

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Three samples of water A,B and C have the D.O levels of 4ppm,and 3.8ppm and 2.1ppm respectively the most polluted sample of water is

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In which region of atmosphere,lowest temperature are observed?

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Which of the following is most toxic?

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Which of the following is primary pollutant?

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Which of the following is primary pollutant(s)

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Identify the secondary pollutant among the following

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In Castner's process of attraction of sodium cathode is

asked Jan 17, 2014 by sreemathi.v

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Which of the following reacts with $BCl_3$ to form diborane

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Ostwald's process is a chemical process for making nitric acid $\text{HNO}_3$ by which of the following methods:

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Aqueous solution of carnalite gives positive test for

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Find out the number of angular nodes in the orbital to which the last electron of Cr enter.

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Given that, $r_{(n+1)}-r_n=r_{(n-1)}$,where $r_n,r_{n-1}$ and $r_{(n+1)}$ are Bohr's radius for H-atom in $n^{th},(n-1)^{th}$ and $(n+1)^{th}$ shell respectively.

asked Jan 17, 2014 by sreemathi.v

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Find out the degeneracy of hydrogen atom that has the energy equal to $-\large\frac{R_H}{9}$.($R_H$-Rydberg constant).

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The magnetic moment of a transition metal ion is $\sqrt{15}$BM.Find out the number of unpaired electrons in it

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Magnetic moment of $A^{3+}$ ion is $5.48\times 10^{-23}J/T$.Find out the number of unpaired electrons in it.($9.27\times 10^{-24}J/T$=1BM)

asked Jan 17, 2014 by sreemathi.v

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Find the ratio of energy of a photon of $2000A^{\large\circ}$ wavelength radiation to that of $4000A^{\large\circ}$ radiation.

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The electron in $Li^{2+}$ ions are excited from ground state by absorbing $8.4375R_h$ energy/electron.How much emission lines are expected during de-excitation of electrons to ground state ?

asked Jan 17, 2014 by sreemathi.v

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What is the ratio of wavelength of II line of Balmer series and I line of Lyman series

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H-atoms in ground state (13.6eV) are excited by monochromatic radiations of photon of energy 12.1eV. Find the number of spectral lines emitted in H atom.

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The ionization energy of a H like Bohr's atom is 4 Rydberg.Calculate the wavelength radiated when electron jumps from the first excited state to ground state.

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Calculate the uncertainty in velocity of an electron if the uncertainty in its position is of the order of $1A^{\large\circ}$

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The $\lambda$ of $H_{\alpha}$ line of Balmer series is $6500A^{\large\circ}$.What is the $\lambda$ of $H_{\beta}$ line of Balmer series?

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If uncertainties in the measurement of position and momentum of an electron are equal,calculate uncertainty in the measurement of velocity.

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The maximum kinetic energy of photoelectrons ejected from a metal,when it is irradiated with radiation of frequency $2\times 10^{14}s^{-1}$ is $6.63\times 10^{-20}J$.The threshold frequency of metal is

asked Jan 17, 2014 by sreemathi.v

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Photoelectrons are liberated by ultraviolet light of wavelength $3000A^{\large\circ}$ from a metallic surface for which the photoelectric threshold is 4000$A^{\large\circ}$.Calculate De-Broglie wavelength of electrons emitted with maximum kinetic energy.

asked Jan 17, 2014 by sreemathi.v

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