Chemistry-
General
Easy
Question
Assertion:Inhydrogenenergyof4sismore than3d.
Reason: An orbitals with lower value of (n+l) has smaller energy than the orbital with higher value of (n+l).
- If both Assertion and Reason are true and the Reason is correct explanation of the Assertion.
- If both Assertion and Reason are true but the Reason is not correct explanation of the Assertion.
- If Assertion is true but the Reason is false.
- If Assertion & Reason are false.
The correct answer is: If both Assertion and Reason are true but the Reason is not correct explanation of the Assertion.
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chemistry-
Assertion: The configuration for B atom cannot be1s2 2s3.
Reason: Hund’s rule demands that the configuration should display maximum multiplicity.
Assertion: The configuration for B atom cannot be1s2 2s3.
Reason: Hund’s rule demands that the configuration should display maximum multiplicity.
chemistry-General
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Assertion: A spectral line will be seen for a 2px–2py transition.
Reason: Only balmer lines are observed in the visible region.
Assertion: A spectral line will be seen for a 2px–2py transition.
Reason: Only balmer lines are observed in the visible region.
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Assertion: The ground state configuration of Cr is 3d5.4s1.
Reason: A set of exactly half filled orbitals contaning parallels pin arrangement provide extra stability.
Assertion: The ground state configuration of Cr is 3d5.4s1.
Reason: A set of exactly half filled orbitals contaning parallels pin arrangement provide extra stability.
chemistry-General
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Ionisation energy of He+ is19.6× 10–18 J atom–1.The energy of the first stationary state (n=1) of Li2+is
Ionisation energy of He+ is19.6× 10–18 J atom–1.The energy of the first stationary state (n=1) of Li2+is
chemistry-General
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If the nitrogen atom had electronic configuration1s7,it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3,because the electrons would be closer to the nucleus.Yet,1s7 is not observed because it violates.
If the nitrogen atom had electronic configuration1s7,it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3,because the electrons would be closer to the nucleus.Yet,1s7 is not observed because it violates.
chemistry-General
chemistry-
Un certainty in the position of an electron (mass=9.1×10–31kg) moving with a velocity 300m/s,accurateupto0.001%,willbe (h=6.63×10–34Js)
Un certainty in the position of an electron (mass=9.1×10–31kg) moving with a velocity 300m/s,accurateupto0.001%,willbe (h=6.63×10–34Js)
chemistry-General
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The orbital angular momentum for an electron revolving in an orbit is given by 
This moment us for an s-electron will be given by-
The orbital angular momentum for an electron revolving in an orbit is given by This moment us for an s-electron will be given by-
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An atom of Cr[Z=24] loses 2electrons. How many unparied electrons shall be there inCr+2
An atom of Cr[Z=24] loses 2electrons. How many unparied electrons shall be there inCr+2
chemistry-General
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Which one of the following electron transitions between energy level in the hydrogen atom produces the line of shortest wavelength in hydrogen spectrum?
Which one of the following electron transitions between energy level in the hydrogen atom produces the line of shortest wavelength in hydrogen spectrum?
chemistry-General
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The wavelgth of radiation emitted when and electron in a hydrogen atom makes a transition from an energy level within=3 to a level with n= 2 is :[Given that En =
kJmol-1 ]
The wavelgth of radiation emitted when and electron in a hydrogen atom makes a transition from an energy level within=3 to a level with n= 2 is :[Given that En = kJmol-1 ]
chemistry-General
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Which of the following has maximum number of unpaired electrons:
Which of the following has maximum number of unpaired electrons:
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Which of the following pairs is correctly matched
Which of the following pairs is correctly matched
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Electronic configuration:1s2,2s22p6,3s23p6 3d54s1represents
Electronic configuration:1s2,2s22p6,3s23p6 3d54s1represents
chemistry-General
chemistry-
Correct statement is:
Correct statement is:
chemistry-General
chemistry-
Which of the following are isoelectronic NO3,CO3 ,ClO3,SO3:
Which of the following are isoelectronic NO3,CO3 ,ClO3,SO3:
chemistry-General
