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Select the correct statements :

A

The total intenesity of radiations (power emitted /surface area ) over all wavelingths is directluy proportional to fourth power of absolutie temperature during black body radiations .

B

The degeneracy of orbitals fo a sghell in absence of magenetic field exst only in one electron systems .

C

An irbutak cab be defucbed by for quantum numbers .

D

Agsorpotion spectera are used by asronomers to identify elements in the outer layer if stars.

Text Solution

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The correct Answer is:
A, B, D
An orbital can be difined by only three quantum numbers.
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Knowledge Check

  • Select the correct statement(s):

    A
    `NaHCO_(2)` is sparingly soluble in water because ithas massive H-bonding
    B
    When `BaCI_(2)` reacts with bicarbonatie, then white ppt of `BaCO_(3)` is formed
    C
    `HgCI_(2)` is poisonous
    D
    Phenophthelein is turned pink by soluble carbonate and colourless by soluble hydrogen carbonate.

  • Select the correct statement(s):

    A
    White ppt of `BaSO_(3)` and `CaSO_(4)` is soluble in dil `HNO_(3)` dil `HCI` and `CH_(3)COOH`
    B
    On standing the precipitate `BaSO_(4)` is slowly oxidised to salphte and then becomes insolable in dilute mineral acid
    C
    When excess of `SO_(2)` gas is passed into the solution of `BaSO_(3)` and `CaSO_(3) ` then white turbility disappeare
    D
    The hydrogen carbonate of alkali metals are soluble in water , but are less soluble then the cprresponding normal carbotates

  • Select the correct statement(s):

    A
    When `HgCI_(2)` reacts with carbotate ion , then basic mercoury (II) carbonate ion , then `PH` of solution hight increase
    B
    When `HgCI_(2)` reacts with carbonate ion , Then `pH` of solution highly increases
    C
    The excess of carbotate acts as buiffer reactys with the hydrogen ions formed in the reaction
    `CO_(3)^(2-) + 2H^(o+) rarr CO_(2) uarr H_(2)O`
    D
    White ppt of `MgCO_(3) `soble in dil `H_(2)SO_(4)`

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