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Recent questions in Chemistry

Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Sodium atom emits light with a wavelength of 330nm when an electron moves from a 4p orbital to a 3s orbital. what is the energy difference between the orbitals in KJ/mol?

asked Feb 6, 2014 by sharmaaparna1

1 answer

An argon laser emits blue light with a wavelength of 488.0nm. How many photon are emitted by this laser in 2.00 sec,operating a power of 515 milliwatts?(one watt = 1J$S^{-1}$)

asked Feb 6, 2014 by sharmaaparna1

1 answer

The energy required for the ionisation of a certain atom is $3.44\times10^{-18}J$. The absorption of a photon of unknown wavelength ionises the atom and ejects an electron with velocity $1.03\times10^6$ m/sec. Calculate the wavelength of the incident radiation.

asked Feb 5, 2014 by sharmaaparna1

1 answer

Calculate the wavelength of the first line and the series limit for the Lyman series for hydrogen.(Series limit is for the case when $n_2 = \infty)$

asked Feb 5, 2014 by sharmaaparna1

1 answer

An electron difraction experiment was performed with a beam of electrons accelerated by a potential difference of 10.0kV.What is the wavelength of the electron beam?(1KV = 1000V = 1000eV for the electron)

asked Feb 5, 2014 by sharmaaparna1

1 answer

A proton is accelerated to one tenth of the velocity of light. Suppose velocity can be measured with a precision of $\pm1\%$, what can be the uncertainity in its position?

asked Feb 5, 2014 by sharmaaparna1

1 answer

The speed of a certain proton is $4.5\times10^5m$ If the uncertainity is to be reduced to 0.01percent, what uncertainity in its location must be tolerated?

asked Feb 5, 2014 by sharmaaparna1

1 answer

Two particles A and B are in motion . if the wavelength associated with particle A is $5\times10^{-8}$m.Calculate the wavelength associated with particle B if its momentum is half of A.

asked Feb 5, 2014 by sharmaaparna1

1 answer

Calculate the wavelength of a helium atom whose speed is equal to root mean square speed at 293 K $(rms = \sqrt{3RT/m})$

asked Feb 4, 2014 by sharmaaparna1

1 answer

The wavelength of $\beta$ line of the Balmer Series is $4815 A^{\large\circ}$. What is the wavelength of $\alpha$ line of balmer Series of the same atom?

asked Feb 4, 2014 by sharmaaparna1

1 answer

AIR services on vividh Bharti is transmitted on 219m band.What is its transmission frequency in Hertz.

asked Feb 4, 2014 by sharmaaparna1

1 answer

A certain laser transition emits $6.37\times10^{15}$ quants per second per square meter. Calculate the power out put in joule per square metre per second. Given $\lambda$ = 632.8 nm.

asked Feb 4, 2014 by sharmaaparna1

1 answer

A photon of 300nm is absorbed by a gas and then re-emits two photons. One re-emitted photon has wavelength 496nm. Calculate energy of other photon re-emitted out.

asked Feb 4, 2014 by sharmaaparna1

1 answer

(Crystal Field Theory) Strong field ligands such as $CN^-$:

asked Feb 3, 2014 by sreemathi.v

1 answer

(Crystal Field Theory) Consider the violet-colored compound, $[Cr(OH_2)_6]Cl_3$ and the yellow compound, $[Cr(NH_3)_6]Cl_3$. Which of the following statements is false?

asked Feb 3, 2014 by sreemathi.v

1 answer

(Crystal Field Theory) Consider the complex ion $[Mn(OH_2)_6]^{2+}$ with 5 unpaired electrons. Which response includes all the following statements that are true, and no false statements?

asked Feb 3, 2014 by sreemathi.v

1 answer

(Crystal Field Theory) How many unpaired electrons are there in a strong field iron(II) octahedral complex?

asked Feb 3, 2014 by sreemathi.v

1 answer

(Crystal Field Theory) When the valence d orbitals of the central metal ion are split in energy in an octahedral ligand field, which orbitals are raised least in energy?

asked Feb 3, 2014 by sreemathi.v

1 answer

(Crystal Field Theory) Which one of the following statements is FALSE?

asked Feb 3, 2014 by sreemathi.v

1 answer

The coordination complex, $[Cu(OH_2)_6]^{2+}$ has one unpaired electron. Which of the following statements are true?

asked Feb 3, 2014 by sreemathi.v

1 answer

In which one of the following species does the transition metal ion have $d^3$ electronic configuration?

asked Feb 3, 2014 by sreemathi.v

1 answer

A molecule that cannot be superimposed on its mirror image is said to exhibit which of the following?

asked Feb 3, 2014 by sreemathi.v

1 answer

Which one of the following complexes can exhibit geometrical isomerism?

asked Feb 3, 2014 by sreemathi.v

1 answer

(Valance Bond Theory) Magnetic measurements indicate that $ [Co(OH_2)_6]^{2+}$ has 3 unpaired electrons. Therefore, the hybridization of the metal's orbitals in $[Co(OH_2)_6]^{2+}$ is :

asked Feb 3, 2014 by sreemathi.v

1 answer

What is the oxidation number of the central metal atom in the coordination compound $[Pt(NH_3)_3Cl]Cl?$

asked Feb 3, 2014 by sreemathi.v

1 answer

Which name-formula combination is NOT correct?

asked Feb 3, 2014 by sreemathi.v

1 answer

Select the correct IUPAC name for: $[Co(NH_3)_6]^{2+}$

asked Feb 3, 2014 by sreemathi.v

1 answer

Select the correct IUPAC name for: $[FeF_4(OH_2)_2]^-$

asked Feb 3, 2014 by sreemathi.v

1 answer

Given the list of ligands and their corresponding names, choose the pair that disagree.

asked Feb 3, 2014 by sreemathi.v

1 answer

Consider the coordination compound,$K_2[Cu(CN)_4]$.A coordinate covalent bond exists between

asked Feb 3, 2014 by sreemathi.v

1 answer

Consider the coordination compound,$Na_2[Pt(CN)_4]$.The Lewis acid is

asked Feb 3, 2014 by sreemathi.v

1 answer

In coordination chemistry, the donor atom of a ligand is

asked Feb 3, 2014 by sreemathi.v

1 answer

The ________ sphere is enclosed in brackets in formulas for complex species, and it includes the central metal ion plus the coordinated groups.

asked Feb 3, 2014 by sreemathi.v

1 answer

One mole of the complex compound $CO(NH_3)_5Cl_3$ gives 3 moles of ions on dissolution in water.On a mole of the same complex reacts with 2 moles of $AgNO_3$ solution to yield 2 moles of $AgCl(s)$.The structure of complex is

asked Feb 3, 2014 by sreemathi.v

1 answer

Coordination compound have great importance in biological system .In this content which of the following statement is incorrect

asked Feb 3, 2014 by sreemathi.v

1 answer

The coordination number of central metal atom in a complex is determined by

asked Feb 3, 2014 by sreemathi.v

1 answer

$[Cr(H_2O)_5Cl]SO_4$ and $[Cr(H_2O)_5SO_4]Cl$ are

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following is true for the complexes $[Ni(CN)_4]^{2-}$ and $[NiCl_4]^{2-}$

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following facts about the complex $[Cr(NH_3)_6]Cl_3$ is wrong

asked Feb 3, 2014 by sreemathi.v

1 answer

Which one of the following has an optical isomer

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following pairs represents linkage isomers :

asked Feb 3, 2014 by sreemathi.v

1 answer

Which of the following has an optical isomer

asked Feb 3, 2014 by sreemathi.v

1 answer

In which of the following octahedral complexes of CO(at.no=27),will be magnitude of $\Delta_0$ be the highest

asked Feb 3, 2014 by sreemathi.v

1 answer

The coordination number and the oxidation state of the element 'E' in the complex $[E(en)_2(C_2O_4)]NO_2$ when 'en' is ethylenediamine

asked Feb 3, 2014 by sreemathi.v

1 answer

Identify the correct order of solubility of $Na_2S, CuS$ and $ZnS$ in aqueous solution

asked Feb 1, 2014 by mosymeow_1

1 answer

The reagent $NH_4Cl$ and aqueous $NH_3$ will precipitate

asked Feb 1, 2014 by mosymeow_1

1 answer

Potassium ferrocyanide is used in the detection of

asked Feb 1, 2014 by mosymeow_1

1 answer

A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube produces violet coloured fumes and droplets of metal appear on the cooler parts of test tube. The red solid is

asked Feb 1, 2014 by mosymeow_1

1 answer

Which of the following metal sulphides has maximum solubility in water?

asked Feb 1, 2014 by mosymeow_1

1 answer

When chlorine water is added to an aqueous solution of potassium halide in the presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution.

asked Feb 1, 2014 by mosymeow_1

1 answer

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